mirror of
https://github.com/apache/nuttx.git
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SAMA5D4-EK: Add bootloader that runs from ISRAM and loads an Intel HEX file into DRAM
This commit is contained in:
Gregory Nutt
@@ -64,7 +64,7 @@ config SAMA5D3xEK_NOR_START
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---help---
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The default behavior of the NOR boot program is to initialize the
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NOR FLASH at CS0, then patiently wait for you to break into the
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program with GDB. An alternative behvior is enabled with this
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program with GDB. An alternative behavior is enabled with this
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option: If SAMA5D3xEK_NOR_START is defined, then it will not wait but
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will, instead, immediately start the program in NOR FLASH.
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@@ -37,6 +37,42 @@ config SAMA5D4EK_MT47H64M16HR
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endchoice # SAMA4D4-EK DRAM Type
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config SAMA5D4EK_DRAM_MAIN
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bool "Build dram_main"
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default n
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depends on SAMA5_BOOT_ISRAM
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---help---
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dram_main is a tiny program that runs in ISRAM. dram_main will
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enable SDRAM and load an Intel HEX program into SDRAM over the
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serial console. Then it will either (1) jump to the program in
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DRAM at address 0x2000:0000 (2) wait for you to break in with GDB to
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debug the SDRAM program. These different behaviors are controlled
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by SAMA5D4EK_DRAM_START.
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NOTE: If you use this boot loader, then your program must be built at
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origin 0x2000:0000, not at 0x2100:0000 as is customary with U-Boot.
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config SAMA5D4EK_DRAM_START
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bool "Start DRAM program"
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default n
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depends on SAMA5D4EK_DRAM_MAIN
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---help---
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The default behavior of the DRAM boot program is to initialize the
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DRAM, then patiently wait for you to break into the program with GDB.
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An alternative behavior is enabled with this option: If
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SAMA5D4EK_DRAM_START is defined, then it will not wait but will,
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instead, immediately start the program in DRAM.
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config SAMA5D4EK_DRAM_BOOT
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bool "Using DRAM boot loader"
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default y
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depends on SAMA5_BOOT_SDRAM && !SAMA5D4EK_DRAM_MAIN
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---help---
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Select this option if you are going to boot using the sdram_main
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bootloader (created with SAMA5D4EK_DRAM_MAIN=y). This selection
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will simply origin your program at 0x2000:0000 as required by the
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sdram_main bootloader (vs. 0x2100:0000 as required by U-Boot).
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config SAMA5D4EK_NAND_AUTOMOUNT
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bool "NAND FLASH auto-mount"
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default n
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@@ -62,6 +62,7 @@ Contents
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- NXFLAT Toolchain
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- Loading Code into SRAM with J-Link
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- Writing to FLASH using SAM-BA
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- Creating and Using DRAMBOOT
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- Running NuttX from SDRAM
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- PIO Usage
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- Buttons and LEDs
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@@ -328,14 +329,108 @@ Writing to FLASH using SAM-BA
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re-open the terminal emulator program.
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10. Power cycle the board.
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Creating and Using DRAMBOOT
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===========================
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In order to have more control of debugging code that runs out of DARM,
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I created the sama5d4-ek/dramboot configuration. That configuration is
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described below under "Configurations."
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Here are some general instructions on how to build an use dramboot:
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Building:
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1. Remove any old configurations (if applicable).
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cd <nuttx>
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make distclean
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2. Install and build the dramboot configuration. This steps will establish
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the dramboot configuration and setup the PATH variable in order to do
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the build:
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cd tools
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./configure.sh sama5d4-ek/dramboot
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cd -
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. ./setenv.sh
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Before sourcing the setenv.sh file above, you should examine it and
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perform edits as necessary so that TOOLCHAIN_BIN is the correct path
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to the directory than holds your toolchain binaries.
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NOTE: Be aware that the default dramboot also disables the watchdog.
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Since you will not be able to re-enable the watchdog later, you may
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need to set CONFIG_SAMA5_WDT=y in the NuttX configuration file.
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Then make dramboot:
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make
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This will result in an ELF binary called 'nuttx' and also HEX and
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binary versions called 'nuttx.hex' and 'nuttx.bin'.
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3. Rename the binaries. Since you will need two versions of NuttX: this
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dramboot version that runs in internal SRAM and another under test in
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NOR FLASH, I rename the resulting binary files so that they can be
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distinguished:
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mv nuttx dramboot
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mv nuttx.hex dramboot.hex
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mv nuttx.bin dramboot.bin
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4. Build the "real" DRAM configuration. This will create the nuttx.hex
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that you will load using dramboot.
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5. Restart the system holding DIS_BOOT. You should see the RamBOOT
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prompt on the 115200 8N1 serial console (and nothing) more. Hit
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the ENTER key with the focus on your terminal window a few time.
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This will enable JTAG.
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6. Then start the J-Link GDB server and GDB. In GDB, I do the following:
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(gdb) mon heal # Halt the CPU
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(gdb) load dramboot # Load dramboot into internal SRAM
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(gdb) mon go # Start dramboot
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You should see this message:
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Send Intel HEX file now
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Load your program by sending the nuttx.hex via the terminal program.
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Then:
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(gdb) mon halt # Break in
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(gdb) mon reg pc = 0x20000040 # Set the PC to DRAM entry point
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(gdb) mon go # And jump into DRAM
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The dramboot program can also be configured to jump directly into
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DRAM without requiring the final halt and go by setting
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CONFIG_SAMA5D4EK_DRAM_START=y in the NuttX configuration. However,
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since I have been debugging the early boot sequence, the above
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sequence has been most convenient for me since it allows me to
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step into the program in SDRAM.
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7. An option is to use the SAM-BA tool to write the DRAMBOOT image into
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Serial FLASH. Then, the system will boot from Serial FLASH by
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copying the DRAMBOOT image in SRAM which will run, download the nuttx.hex
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file, and then start the image loaded into DRAM automatically. This is
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a very convenient usage!
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NOTES: (1) There is that must be closed to enable use of the AT25
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Serial Flash. (2) If using SAM-BA, make sure that you load the DRAM
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boot program into the boot area via the pull-down menu.
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Running NuttX from SDRAM
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========================
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NuttX may be executed from SDRAM. But this case means that the NuttX
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binary must reside on some other media (typically NAND FLASH, Serial
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FLASH, or, perhaps even a TFTP server). In these cases, an intermediate
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bootloader such as U-Boot or Barebox must be used to configure the
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SAMA5D4 clocks and SDRAM and then to copy the NuttX binary into SDRAM.
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FLASH) or transferred over some interface (perhaps a UARt or even a
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TFTP server). In these cases, an intermediate bootloader such as U-Boot
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or Barebox must be used to configure the SAMA5D4 clocks and SDRAM and
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then to copy the NuttX binary into SDRAM.
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The SRAMBOOT program is another option (see above). But this section
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will focus on U-Boot.
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- NuttX Configuration
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- Boot sequence
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@@ -2420,6 +2515,10 @@ Watchdog Timer
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the WDT, we cannot disable the watchdog time if CONFIG_SAMA5_WDT=y. So,
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be forewarned: You have only 16 seconds to run your watchdog timer test!
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NOTE: If you are using the dramboot program to run from DRAM as I did,
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beware that the default version also disables the watchdog. You will
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need a special version of dramboot with CONFIG_SAMA5_WDT=y.
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TRNG and /dev/random
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====================
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@@ -2809,6 +2908,9 @@ Configurations
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Summary: Some of the descriptions below are long and wordy. Here is the
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concise summary of the available SAMA4D4-EK configurations:
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dramboot: This is a little program to help debug of code in DRAM. See
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the description below and the section above entitled "Creating and
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Using DRAMBOOT" for more information
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nsh: This is another NSH configuration, not too different from the
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demo configuration. The nsh configuration is, however, bare bones.
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It is the simplest possible NSH configuration and is useful as a
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@@ -2823,6 +2925,86 @@ Configurations
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Now for the gory details:
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dramboot:
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This is a little program to help debug of code in DRAM. It does the
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following:
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- It configures DRAM,
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- It loads and Intel HEX file into DRAM over the terminal port,
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- Waits for you to break in with GDB.
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At that point, you can set the PC and begin executing from SDRAM under
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debug control. See the section entitled "Creating and Using
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DRAMBOOT" above.
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NOTES:
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1. This configuration uses the the USART3 for the serial console
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which is available at the "DBGU" RS-232 connector (J24). That
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is easily changed by reconfiguring to (1) enable a different
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serial peripheral, and (2) selecting that serial peripheral as
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the console device.
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2. By default, this configuration is set up to build on Windows
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under either a Cygwin or MSYS environment using a recent, Windows-
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native, generic ARM EABI GCC toolchain (such as the CodeSourcery
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toolchain). Both the build environment and the toolchain
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selection can easily be changed by reconfiguring:
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CONFIG_HOST_WINDOWS=y : Windows operating system
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CONFIG_WINDOWS_CYGWIN=y : POSIX environment under windows
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CONFIG_ARMV7A_TOOLCHAIN_CODESOURCERYW=y : CodeSourcery for Windows
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If you are running on Linux, make *certain* that you have
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CONFIG_HOST_LINUX=y *before* the first make or you will create a
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corrupt configuration that may not be easy to recover from. See
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the warning in the section "Information Common to All Configurations"
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for further information.
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3. This configuration executes out of internal SRAM flash and is
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loaded into SRAM by the boot RomBoot from NAND, Serial
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DataFlash, SD card or from a TFTPC sever via the Boot ROM.
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Data also is positioned in SRAM.
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2. The default dramboot program initializes the DRAM memory,
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displays a message, loads an Intel HEX program into DRAM over the
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serial console and halts. The dramboot program can also be
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configured to jump directly into DRAM without requiring the
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final halt and go by setting CONFIG_SAMA5D4EK_DRAM_START=y in the
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NuttX configuration.
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3. Be aware that the default dramboot also disables the watchdog.
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Since you will not be able to re-enable the watchdog later, you may
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need to set CONFIG_SAMA5_WDT=y in the NuttX configuration file.
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4. If you put dramboot on the Serial FLASH, you can automatically
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boot to SDRAM on reset. See the section "Creating and Using DRAMBOOT"
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above.
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5. Here are the steps that I use to execute this program in SRAM
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using only the ROM Bootloader:
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a) Hold the DIS_BOOT button and
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b) With the DIS_BOOT button pressed, power cycle the board. A
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reset does not seem to be sufficient.
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c) The serial should show RomBOOT in a terminal window (at 115200
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8N1) and nothing more.
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d) Press ENTER in the terminal window a few times to enable JTAG.
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e) Start the Segger GDB server. It should successfully connect to
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the board via JTAG (if JTAG was correctly enabled in step d)).
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f) Start GDB, connect, to the GDB server, load NuttX, and debug.
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gdb> target remote localhost:2331
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gdb> mon halt (don't do mon reset)
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gdb> load nuttx
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gdb> mon reg pc (make sure that the PC is 0x200040
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gdb> ... and debug ...
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nsh:
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This configuration directory provide the NuttShell (NSH). This is a
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@@ -2830,6 +3012,7 @@ Configurations
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functionality.
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NOTES:
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1. This configuration uses the the USART3 for the serial console
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which is available at the "DBGU" RS-232 connector (J24). That
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is easily changed by reconfiguring to (1) enable a different
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@@ -2917,6 +3100,7 @@ Configurations
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bringing up SDRAM.
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NOTES:
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1. This configuration uses the the USART3 for the serial console
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which is available at the "DBGU" RS-232 connector (J24). That
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is easily changed by reconfiguring to (1) enable a different
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@@ -2942,7 +3126,7 @@ Configurations
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3. This configuration executes out of internal SRAM flash and is
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loaded into SRAM by the boot ROM SDRAM from NAND, Serial
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DataFlash, SD card or from a TFTPC sever via the Boot ROM.
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Data also is positioned in SDRAM.
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Data also is positioned in SRAM.
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Here are the steps that I use to execute this program in SRAM
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using only the ROM Bootloader:
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@@ -0,0 +1,126 @@
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############################################################################
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# configs/sama5d4-ek/dramboot/Make.defs
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#
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# Copyright (C) 2014 Gregory Nutt. All rights reserved.
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# Author: Gregory Nutt <gnutt@nuttx.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
|
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# the documentation and/or other materials provided with the
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# distribution.
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# 3. Neither the name NuttX nor the names of its contributors may be
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
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# POSSIBILITY OF SUCH DAMAGE.
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#
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############################################################################
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include ${TOPDIR}/.config
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include ${TOPDIR}/tools/Config.mk
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include ${TOPDIR}$(DELIM)arch$(DELIM)arm$(DELIM)src$(DELIM)armv7-a$(DELIM)Toolchain.defs
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ifeq ($(CONFIG_SAMA5_BOOT_ISRAM),y)
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LDSCRIPT = isram.ld
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endif
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ifeq ($(CONFIG_SAMA5_BOOT_SDRAM),y)
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LDSCRIPT = ddram.ld
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endif
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ifeq ($(WINTOOL),y)
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# Windows-native toolchains
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ARCHINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)$(DELIM)include}"
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ARCHXXINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)$(DELIM)include}" -isystem "${shell cygpath -w $(TOPDIR)$(DELIM)include$(DELIM)cxx}"
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ARCHSCRIPT = -T "${shell cygpath -w $(TOPDIR)$(DELIM)configs$(DELIM)$(CONFIG_ARCH_BOARD)$(DELIM)scripts$(DELIM)$(LDSCRIPT)}"
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else
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# Linux/Cygwin-native toolchain
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ARCHINCLUDES = -I. -isystem $(TOPDIR)$(DELIM)include
|
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ARCHXXINCLUDES = -I. -isystem $(TOPDIR)$(DELIM)include -isystem $(TOPDIR)$(DELIM)include$(DELIM)cxx
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ARCHSCRIPT = -T$(TOPDIR)$(DELIM)configs$(DELIM)$(CONFIG_ARCH_BOARD)$(DELIM)scripts$(DELIM)$(LDSCRIPT)
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endif
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CC = $(CROSSDEV)gcc
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CXX = $(CROSSDEV)g++
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CPP = $(CROSSDEV)gcc -E
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LD = $(CROSSDEV)ld
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AR = $(ARCROSSDEV)ar rcs
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NM = $(ARCROSSDEV)nm
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OBJCOPY = $(CROSSDEV)objcopy
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OBJDUMP = $(CROSSDEV)objdump
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ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
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ARCHOPTIMIZATION = -g
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endif
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ifneq ($(CONFIG_DEBUG_NOOPT),y)
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ARCHOPTIMIZATION += $(MAXOPTIMIZATION) -fno-strict-aliasing -fno-strength-reduce -fomit-frame-pointer
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endif
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ARCHCPUFLAGS = -mcpu=cortex-a5 -mfpu=vfpv4-d16
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ARCHCFLAGS = -fno-builtin
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ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fno-rtti
|
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ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow
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ARCHWARNINGSXX = -Wall -Wshadow
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ARCHDEFINES =
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ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
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CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
|
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CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
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CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
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CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
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CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
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AFLAGS = $(CFLAGS) -D__ASSEMBLY__
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NXFLATLDFLAGS1 = -r -d -warn-common
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NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)$(DELIM)binfmt$(DELIM)libnxflat$(DELIM)gnu-nxflat-pcrel.ld -no-check-sections
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LDNXFLATFLAGS = -e main -s 2048
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OBJEXT = .o
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LIBEXT = .a
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EXEEXT =
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ifneq ($(CROSSDEV),arm-nuttx-elf-)
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LDFLAGS += -nostartfiles -nodefaultlibs
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endif
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ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
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LDFLAGS += -g
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endif
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HOSTCC = gcc
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HOSTINCLUDES = -I.
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HOSTCFLAGS = -Wall -Wstrict-prototypes -Wshadow -g -pipe
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HOSTLDFLAGS =
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ifeq ($(CONFIG_HOST_WINDOWS),y)
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HOSTEXEEXT = .exe
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else
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||||
HOSTEXEEXT =
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endif
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||||
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ifeq ($(WINTOOL),y)
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# Windows-native host tools
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DIRLINK = $(TOPDIR)$(DELIM)tools$(DELIM)copydir.sh
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||||
DIRUNLINK = $(TOPDIR)$(DELIM)tools$(DELIM)unlink.sh
|
||||
MKDEP = $(TOPDIR)$(DELIM)tools$(DELIM)mknulldeps.sh
|
||||
else
|
||||
# Linux/Cygwin-native host tools
|
||||
MKDEP = $(TOPDIR)$(DELIM)tools$(DELIM)mkdeps$(HOSTEXEEXT)
|
||||
endif
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
Executable
+76
@@ -0,0 +1,76 @@
|
||||
#!/bin/bash
|
||||
# configs/sama5d4-ek/dramboot/setenv.sh
|
||||
#
|
||||
# Copyright (C) 2014 Gregory Nutt. All rights reserved.
|
||||
# Author: Gregory Nutt <gnutt@nuttx.org>
|
||||
#
|
||||
# Redistribution and use in source and binary forms, with or without
|
||||
# modification, are permitted provided that the following conditions
|
||||
# are met:
|
||||
#
|
||||
# 1. Redistributions of source code must retain the above copyright
|
||||
# notice, this list of conditions and the following disclaimer.
|
||||
# 2. Redistributions in binary form must reproduce the above copyright
|
||||
# notice, this list of conditions and the following disclaimer in
|
||||
# the documentation and/or other materials provided with the
|
||||
# distribution.
|
||||
# 3. Neither the name NuttX nor the names of its contributors may be
|
||||
# used to endorse or promote products derived from this software
|
||||
# without specific prior written permission.
|
||||
#
|
||||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
# POSSIBILITY OF SUCH DAMAGE.
|
||||
#
|
||||
|
||||
if [ "$_" = "$0" ] ; then
|
||||
echo "You must source this script, not run it!" 1>&2
|
||||
exit 1
|
||||
fi
|
||||
|
||||
WD=`pwd`
|
||||
if [ ! -x "setenv.sh" ]; then
|
||||
echo "This script must be executed from the top-level NuttX build directory"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
if [ -z "${PATH_ORIG}" ]; then
|
||||
export PATH_ORIG="${PATH}"
|
||||
fi
|
||||
|
||||
# This is the Cygwin path to the location where I installed the Atmel GCC
|
||||
# toolchain under Windows. You will also have to edit this if you install
|
||||
# this toolchain in any other location
|
||||
#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/Atmel/Atmel Toolchain/ARM GCC/Native/4.7.3.99/arm-gnu-toolchain/bin"
|
||||
|
||||
# This is the Cygwin path to the location where I installed the CodeSourcery
|
||||
# toolchain under windows. You will also have to edit this if you install
|
||||
# the CodeSourcery toolchain in any other location
|
||||
#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
|
||||
export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
|
||||
|
||||
# These are the Cygwin paths to the locations where I installed the Atollic
|
||||
# toolchain under windows. You will also have to edit this if you install
|
||||
# the Atollic toolchain in any other location. /usr/bin is added before
|
||||
# the Atollic bin path because there is are binaries named gcc.exe and g++.exe
|
||||
# at those locations as well.
|
||||
#export TOOLCHAIN_BIN="/usr/bin:/cygdrive/c/Program Files (x86)/Atollic/TrueSTUDIO for ARM Pro 2.3.0/ARMTools/bin"
|
||||
#export TOOLCHAIN_BIN="/usr/bin:/cygdrive/c/Program Files (x86)/Atollic/TrueSTUDIO for STMicroelectronics STM32 Lite 2.3.0/ARMTools/bin"
|
||||
|
||||
# This is the Cygwin path to the location where I build the buildroot
|
||||
# toolchain.
|
||||
#export TOOLCHAIN_BIN="${WD}/../misc/buildroot/build_arm/staging_dir/bin"
|
||||
|
||||
# Add the path to the toolchain to the PATH varialble
|
||||
export PATH="${TOOLCHAIN_BIN}:/sbin:/usr/sbin:${PATH_ORIG}"
|
||||
|
||||
echo "PATH : ${PATH}"
|
||||
@@ -62,6 +62,10 @@ ifeq ($(CONFIG_SAMA5_EBICS3_NAND),y)
|
||||
CSRCS += sam_nandflash.c
|
||||
endif
|
||||
|
||||
ifeq ($(CONFIG_SAMA5D4EK_DRAM_MAIN),y)
|
||||
CSRCS += dram_main.c
|
||||
endif
|
||||
|
||||
ifeq ($(CONFIG_MTD_AT25),y)
|
||||
ifeq ($(CONFIG_SAMA5_SPI0),y)
|
||||
CSRCS += sam_at25.c
|
||||
|
||||
@@ -0,0 +1,155 @@
|
||||
/*****************************************************************************
|
||||
* configs/sama5d4-ek/src/dram_main.c
|
||||
*
|
||||
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
|
||||
* Author: Gregory Nutt <gnutt@nuttx.org>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
|
||||
#include <stdio.h>
|
||||
#include <debug.h>
|
||||
|
||||
#include <arch/irq.h>
|
||||
#include <apps/hex2bin.h>
|
||||
|
||||
#include "up_arch.h"
|
||||
#include "mmu.h"
|
||||
#include "cache.h"
|
||||
|
||||
#include "sama5d4-ek.h"
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
|
||||
#define DRAM_ENTRY ((dram_entry_t)SAM_DDRCS_VSECTION)
|
||||
|
||||
#define DRAM_WAIT 1
|
||||
#define DRAM_NOWAIT 0
|
||||
|
||||
#ifdef CONFIG_SAMA5D4EK_DRAM_START
|
||||
# define DRAM_BOOT_MODE DRAM_NOWAIT
|
||||
#else
|
||||
# define DRAM_BOOT_MODE DRAM_WAIT
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Private Types
|
||||
****************************************************************************/
|
||||
|
||||
typedef void (*dram_entry_t)(void);
|
||||
|
||||
/****************************************************************************
|
||||
* Private Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: dram_main
|
||||
*
|
||||
* Description:
|
||||
* dram_main is a tiny program that runs in ISRAM. dram_main will
|
||||
* configure DRAM, present a prompt, load and Intel HEX file into DRAM,
|
||||
* and either start that program or wait for you to break in with the
|
||||
* debugger.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int dram_main(int argc, char *argv)
|
||||
{
|
||||
int ret;
|
||||
|
||||
/* Here we have a in memory value we can change in the debugger
|
||||
* to begin booting in NOR Flash
|
||||
*/
|
||||
|
||||
static volatile uint32_t wait = DRAM_BOOT_MODE;
|
||||
|
||||
/* DRAM was already initialized at boot time, so we are ready to load the
|
||||
* Intel HEX stream into DRAM.
|
||||
*/
|
||||
|
||||
printf("Send Intel HEX file now\n");
|
||||
fflush(stdout);
|
||||
|
||||
ret = hex2mem(0, /* Accept Intel HEX on stdin */
|
||||
(uint32_t)SAM_DDRCS_VSECTION,
|
||||
(uint32_t)(SAM_DDRCS_VSECTION + CONFIG_SAMA5_DDRCS_SIZE),
|
||||
0);
|
||||
if (ret < 0)
|
||||
{
|
||||
/* We failed the load */
|
||||
|
||||
printf("ERROR: Intel HEX file load failed: %d\n", ret);
|
||||
fflush(stdout);
|
||||
for(;;);
|
||||
}
|
||||
|
||||
/* Interrupts must be disabled through the following. In this configuration,
|
||||
* there should only be timer interrupts. Your NuttX configuration must use
|
||||
* CONFIG_SERIAL_LOWCONSOLE=y or printf() will hang when the interrupts
|
||||
* are disabled!
|
||||
*/
|
||||
|
||||
(void)irqsave();
|
||||
|
||||
/* Disable the caches and the MMU. Disabling the MMU should be safe here
|
||||
* because there is a 1-to-1 identity mapping between the physical and
|
||||
* virtual addressing.
|
||||
*/
|
||||
|
||||
cp15_disable_mmu();
|
||||
cp15_disable_caches();
|
||||
|
||||
/* Invalidate caches and TLBs */
|
||||
|
||||
cp15_invalidate_icache();
|
||||
cp15_invalidate_dcache_all();
|
||||
cp15_invalidate_tlbs();
|
||||
|
||||
/* Then jump into NOR flash */
|
||||
|
||||
while (wait)
|
||||
{
|
||||
}
|
||||
|
||||
DRAM_ENTRY();
|
||||
|
||||
return 0; /* We should not get here in either case */
|
||||
}
|
||||
Reference in New Issue
Block a user