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SAMA5D4-EK: Add logic to mount an SD card as a boot device

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This commit is contained in:
Gregory Nutt
2014-09-03 08:34:28 -06:00
parent 9a8c90d35c
commit c8da2db7be
5 changed files with 193 additions and 38 deletions
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configs/sama5d4-ek/README.txt
+58 -19
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@@ -1611,7 +1611,8 @@ HSMCI Card Slots
CONFIG_SCHED_WORKQUEUE=y : Driver needs work queue support
Application Configuration -> NSH Library
CONFIG_NSH_ARCHINIT=y : NSH board-initialization
CONFIG_NSH_ARCHINIT=y : NSH board-initialization, OR
CONFIG_BOARD_INITIALIZE=y
Using the SD card
-----------------
@@ -3726,25 +3727,63 @@ Configurations
2014-8-29: System call interface verified.
kernel:
A configuration used to test the SAMA5D kenel build configuration. This configuration is based on the elf configuration. Primary differences in
the two configurations are noted below:
Build Setup -> Build Configuration -> Memory Organization
CONFIG_BUILD_KERNEL=y : Kernel build enabled
RTOS Features -> Tasks and Scheduling
CONFIG_INIT_FILEPATH=y : Start-up is via an ELF file
CONFIG_USER_INITPATH="/bin/init" : The location of the startup
RTOS Features -> System call support
CONFIG_SYS_RESERVED=5 : More reserved SYSCALLs
Memory Management
CONFIG_MM_KERNEL_HEAP=y : Enable a kernel heap
CONFIG_MM_KERNEL_HEAPSIZE=8192 : (temporary.. will change)
A configuration used to test the SAMA5D kenel build configuration.
More to come... this is still a work in progress as of this writing.
Since this configuration is based on the ELF configuration, all of the notes for that configuration apply.
NOTES:
Since this configuration is based on the ELF configuration, all of
the notes for that configuration also apply.
1. This configuration is based on the elf configuration. Primary
differences between the two configurations are noted below:
Build Setup -> Build Configuration -> Memory Organization
CONFIG_BUILD_KERNEL=y : Kernel build enabled
RTOS Features -> Tasks and Scheduling
CONFIG_INIT_FILEPATH=y : Start-up is via an ELF file
CONFIG_USER_INITPATH="/bin/init" : The location of the startup
RTOS Features -> System call support
CONFIG_SYS_RESERVED=5 : More reserved SYSCALLs
Memory Management
CONFIG_MM_KERNEL_HEAP=y : Enable a kernel heap
CONFIG_MM_KERNEL_HEAPSIZE=8192 : (temporary.. will change)
2. Board initialization is performed performed before the application
is started:
RTOS Features -> RTOS Hooks
CONFIG_BOARD_INITITIALIZE=y
The board initialization will mount the FAT filesystem on an SD card
inserted int the HSMCI0 slot (full size). The SAMA4D4-EK provides
two SD memory card slots: (1) a full size SD card slot (J10), and
(2) a microSD memory card slot (J11). The full size SD card slot
connects via HSMCI0; the microSD connects vi HSMCI1. See the relevant
configuration settings above in the paragraph entitled "HSMCI Card
Slots" above.
The SD card is mounted at /bin by this board initialization logic.
NuttX will boot from the SD card so there are some special operational
requirements to use this configuration:
a. The SD card must contain a NuttX executable called 'init'
b. The SD card must be in the HSCMCI slot when NuttX boots and must
not be removed while NuttX is running.
The NuttX automounter is *not* enabled. It cannot be used it would
mount the boot file system with a delay. In this configuration. The
file system must be mounted immediately at boot up. To accomplish
this, the board logic supports these special configurations:
Board Selection ->
CONFIG_SAMA5D4EK_HSMCI0_AMOUNT=y
CONFIG_SAMA5D4EK_HSMCI0_MOUNT_BLKDEV="/dev/mmcsd0"
CONFIG_SAMA5D4EK_HSMCI0_MOUNT_FSTYPE="vfat"
CONFIG_SAMA5D4EK_HSMCI0_MOUNT_MOUNTPOINT="/bin"
nsh: