[PATCH v5 0/3] Add riscv semihosting support in u-boot

[Bin Meng]

Hi Kautuk,

On Tue, Nov 29, 2022 at 2:29 PM Kautuk Consul <kconsul at ventanamicro.com> wrote:
>
> Hi,
>
> Can someone pick this patchset up ?
>
> It has been reviewed and there has been no comment on this in recent days.
>
> Thanks.
>
> On Fri, Sep 23, 2022 at 12:33 PM Kautuk Consul <kconsul at ventanamicro.com> 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 v4:
>> -       Check arch dependencies for SEMIHOSTING as well as SPL_SEMIHOSTING
>>         config options as per Sean's comment.
>> -       arch/riscv/lib/interrupts.c: Check for post and pre instructions
>>         of the ebreak statement whether they are as per the RISCV
>>         semihosting specification. Only then do a disable_semihosting
>>         and epc += 4 and return.
>>
>> 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
>>

Do you have instructions on how to actually test semihosting? Does it
require a JTAG debugger? But I see you are using QEMU?

Regards,
Bin