[PATCH v2 0/3] Add riscv semihosting support in u-boot

[Pali Rohár]

Hello! I'm not riscv maintainer and therefore I'm not going to review
this patch series. Please do not spam me with unrelated emails and
patches as I would loose track of patches and emails which are import
and which I should review. Thanks.

On Friday 16 September 2022 13:42:30 Kautuk Consul wrote:
> Semihosting is a mechanism that enables code running on
> a target to communicate and use the Input/Output
> facilities on a host computer that is running a debugger.
> This patchset adds support for semihosting in u-boot
> for RISCV64 targets.
> 
> CHANGES since v1:
> -   Moved the identical smh_* and semihosting_enabled/disable_semihosting
> 	code of ARM and RISC-V to lib/semihosting.c
> -	Extend the handle_trap() functionality to call disable_semihosting()
> 	if the cause is a breakpoint (i.e. ebreak instruction)
> -	Change our implementation of semihosting_enabled to be exactly the
> 	same as the way ARM implemented it
> -	Additionally enable the CONFIG_SPL_FS_EXT4 and CONFIG_SPL_FS_FAT
> 	configs for qemu defconfigs so that CONFIG_SPL_FS_LOAD_PAYLOAD_NAME
> 	gets automatically enabled instead of us #defining it in
> 	include/configs/qemu-riscv.h
> 
> Compilation and test commands for SPL and S-mode configurations
> =================================================================
> 
> U-Boot S-mode on QEMU virt
> ----------------------------
> // Compilation of S-mode u-boot
> ARCH=riscv
> CROSS_COMPILE=riscv64-unknown-linux-gnu-
> make qemu-riscv64_smode_defconfig
> make
> // Run riscv 64-bit u-boot with opensbi on qemu
> qemu-system-riscv64 -M virt -m 256M -display none -serial stdio -bios\
> opensbi/build/platform/generic/firmware/fw_jump.bin -kernel\
> u-boot/u-boot.bin
> 
> U-Boot SPL on QEMU virt
> ------------------------
> // Compilation of u-boot-spl
> ARCH=riscv
> CROSS_COMPILE=riscv64-unknown-linux-gnu-
> make qemu-riscv64_spl_defconfig
> make OPENSBI=opensbi/build/platform/generic/firmware/fw_dynamic.bin
> // Run 64-bit u-boot-spl in qemu
> qemu-system-riscv64 -M virt -m 256M -display none -serial stdio -bios\
> u-boot/spl/u-boot-spl.bin -device\
> loader,file=u-boot/u-boot.itb,addr=0x80200000
> 
> Kautuk Consul (3):
>   lib: Add common semihosting library
>   arch/riscv: add semihosting support for RISC-V
>   board: qemu-riscv: enable semihosting
> 
>  arch/arm/Kconfig                     |   2 +
>  arch/arm/lib/semihosting.c           | 179 +-------------------------
>  arch/riscv/Kconfig                   |  47 +++++++
>  arch/riscv/include/asm/semihosting.h |  11 ++
>  arch/riscv/include/asm/spl.h         |   1 +
>  arch/riscv/lib/Makefile              |   2 +
>  arch/riscv/lib/interrupts.c          |  11 ++
>  arch/riscv/lib/semihosting.c         |  24 ++++
>  configs/qemu-riscv32_defconfig       |   4 +
>  configs/qemu-riscv32_smode_defconfig |   4 +
>  configs/qemu-riscv32_spl_defconfig   |   7 +
>  configs/qemu-riscv64_defconfig       |   4 +
>  configs/qemu-riscv64_smode_defconfig |   4 +
>  configs/qemu-riscv64_spl_defconfig   |   7 +
>  include/semihosting.h                |  11 ++
>  lib/Kconfig                          |   3 +
>  lib/Makefile                         |   2 +
>  lib/semihosting.c                    | 186 +++++++++++++++++++++++++++
>  18 files changed, 331 insertions(+), 178 deletions(-)
>  create mode 100644 arch/riscv/include/asm/semihosting.h
>  create mode 100644 arch/riscv/lib/semihosting.c
>  create mode 100644 lib/semihosting.c
> 
> -- 
> 2.34.1
>