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risc-v/qemu-rv/rv-virt: Add support to loader ROMFS image in kernel

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Use ROMFS to load user applications in kernel mode instead of using
hostfs.
This commit is contained in:
Tiago Medicci Serrano
2024-01-31 14:49:11 -03:00
committed by Xiang Xiao
parent c86cb9e7ef
commit cb32e6d50a
8 changed files with 282 additions and 2 deletions
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Documentation/platforms/risc-v/qemu-rv/boards/rv-virt/index.rst
+28 -2
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@@ -150,6 +150,29 @@ To build it, use the following command::
Run it with QEMU using the default command for 32-bit RISC-V.
In `nsh`, applications can be run from the `/system/bin` directory::
nsh> /system/bin/hello
knsh32_romfs
------------
Similar to the `knsh32`_ configuration, but uses ROMFS instead of `hostfs`.
A ROMFS image is generated and linked to the kernel. This requires re-running ``make``::
$ make V=1 -j$(nproc)
$ make export V=1 -j$(nproc)
$ pushd ../apps
$ ./tools/mkimport.sh -z -x ../nuttx/nuttx-export-*.tar.gz
$ make import V=1 -j$(nproc)
$ ./tools/mkromfsimg.sh ../nuttx/arch/risc-v/src/board/romfs_boot.c
$ popd
$ make V=1 -j$(nproc)
To run it, use the following command::
$ qemu-system-riscv32 -M virt,aclint=on -cpu rv32 -smp 8 -bios none -kernel nuttx -nographic
In `nsh`, applications can be run from the `/system/bin` directory::
nsh> /system/bin/hello
@@ -310,13 +333,16 @@ If needed, one should also load the application symbols using the following comm
``address`` refers to the ``.text`` section of the application and can be retrieved from the ELF file using the following command::
$ readelf -WS <file> | grep .text
$ riscv-none-elf-readelf -WS <file> | grep .text
For instance, to check the ``.text`` section address of the ``hello`` application, use the following command::
$ readelf -WS ../apps/bin/hello | grep .text
$ riscv-none-elf-readelf -WS ../apps/bin/hello | grep .text
[ 1] .text PROGBITS c0000000 001000 0009e0 00 AX 0 0 2
.. note:: Pay attention that ``riscv-none-elf-readelf`` refers to your toolchain's readelf utility. Adjust accordingly if you are
using a different toolchain.
Then, look for the ``.text`` section address and use the ``c0000000`` as the address to load the symbols.
For instance, if you want to load the ``hello`` application, you can use the following command in GDB::