Re: [PATCH 0/5] Improve Microchip Polarfire SoC customization

[Sebastian Huber <sebastian.huber@embedded-brains.de>]

----- Am 20. Feb 2025 um 23:29 schrieb Philippe Mathieu-Daudé philmd@linaro.org:

> Hi Conor,
> 
> On 20/2/25 19:30, Conor Dooley wrote:
>> +cc qemu-riscv, Alistar.
>> 
>> On Fri, Feb 14, 2025 at 07:24:37AM +0100, Sebastian Huber wrote:
>>> Booting the microchip-icicle-kit machine using the latest PolarFire SoC
>>> Hart Software Services (HSS) no longer works since Qemu lacks support
>>> for several registers (clocks, DRAM controller). Also reading from the
>>> SDCard does not work currently.
>> 
>> On that note, I think the inaccurate docs about polarfire should be
>> removed. There's a wiki page here with dead links, or links to things
>> that do not work anymore:
>> https://wiki.qemu.org/Documentation/Platforms/RISCV#Microchip_PolarFire_SoC_Icicle_Kit
>> I think the whole section should be removed, find it kinda odd that
>> there's a polarfire section but not for any other board. Either way,
>> it's talking about something that just does not work, the current HSS
>> and Yocto don't boot.
>> 
>> There's also a docs page here:
>> https://www.qemu.org/docs/master/system/riscv/microchip-icicle-kit.html
>> that has a copy of the table your patch 4 modifies, that probably should
>> be updated to match your changes.
>> 
>> In a similar vein to the wiki, it talks about the HSS and booting a
>> yocto wic image. I think those should be deleted since they don't work.
>> 
>> Alistar/Other RISC-V folks, what do you think? Bin wrote the port but
>> seems to be AFK and I don't have the capacity to fix any of that stuff
>> on top of what I already do in my spare time - do you agree that
>> deleting the now inaccurate docs makes sense?
>> 
>>> In order to allow tests runs for real-time kernels such as RTEMS and
>>> Zephyr, improve the boot customization. This patch set enables a direct
>>> run of kernel executables, for example:
>>>
>>> qemu-system-riscv64 -no-reboot -nographic \
>>>    -serial null -serial mon:stdio \
>>>    -smp 2 \
>>>    -bios none \
>>>    -machine microchip-icicle-kit,clint-timebase-frequency=10000000 \
>>>    -kernel rtos.elf
>> 
>> The series breaks my usage:
>> qemu//build/qemu-system-riscv64 -M microchip-icicle-kit \
>>          -m 3G -smp 5 \
>>          -kernel vmlinux.bin \
>>          -dtb riscvpc.dtb \
>>          -initrd initramfs.cpio.gz \
>>          -display none -serial null \
>>          -serial mon:stdio \
>>          -D qemu.log -d unimp
>> opensbi-riscv64-generic-fw_dynamic.bin: No such file or directory
>> qemu-system-riscv64: could not load firmware
>> 'opensbi-riscv64-generic-fw_dynamic.bin'
>> make: *** [Makefile:305: qemu-icicle] Error 1
>> 
>> Figure it is likely to be your patch 4? The file does exist, so probably
>> some sort of path-to-it issues?
> 
> Maybe missing the -L option?
> 
>   -L path         set the directory for the BIOS, VGA BIOS and keymaps

It was an error in patch 4/5. I sent a v2 version of it.

You have to find the firmware, before you can load it.

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