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

[Kautuk Consul]

I have tested it both on Qemu and Ventana's internal simulator.

On Tue, Nov 29, 2022 at 12:06 PM Bin Meng <bmeng.cn at gmail.com> wrote:

> 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
>