Re: [Buildroot] Interested in board support for BeagleV-Ahead

[Kilian Zinnecker via buildroot <buildroot@buildroot.org>]

Hello Robert,

> > I am interested in adding board support for the BeagleV-Ahead.
> > 
> > I already started trying to setup the board support, but at the moment it
> > does not work yet, due to some gcc 12 and zicsr and zifencei RiscV
> > extension issue (see below).
> 
> Awesome work!

Thanks!

> BTW, i've created a special u-boot branch for mainline gcc situations,
> with *-ubuntu extension on the branch..
> 
> https://git.beagleboard.org/beaglev-ahead/beaglev-ahead-u-boot/-/tree/beagle
> v-v2020.01-1.1.2-ubuntu

So should I try using that branch then?

> Using kernel.org's x86_64-gcc-13.2.0-nolibc-riscv64-linux.tar.xz
> 
> I've been mostly working on mainline for the board with @Drew Fustini
> 
> Otherwise on the mainline we've been using main branch of opensbi and
> linu's 6.5.x-rc (only eMMC wip support).. not much else on the
> mainline branch yet..

Do you suggest, that I should then try to use mainline kernel, instead of 
"beaglev-ahead-linux" (https://git.beagleboard.org/beaglev-ahead/beaglev-ahead-linux)?

You seem to also be a maintainer for the "beaglev-ahead-linux" repository? Is 
the light_defconfig the proper one for the beaglev-ahead? What do you think 
about the issues I encountered regarding vector extension v0.7.1 and recent 
gcc apparently not supporting it? What do you think about maybe removing the 
CONFIG_VECTOR flags from the light_defconfig?

https://git.beagleboard.org/beaglev-ahead/beaglev-ahead-linux/-/blob/beaglev-v5.10.113-1.1.2/arch/riscv/configs/light_defconfig#L21-22

And also as mentioned in my other mail, I encountered an enum-int-mismatch 
error when compiling with (buildroot generated) gcc v13.2 between a functions 
an its prototype, see here:

https://git.beagleboard.org/beaglev-ahead/beaglev-ahead-linux/-/blob/beaglev-v5.10.113-1.1.2/drivers/gpu-viv/hal/os/linux/kernel/gc_hal_kernel_linux.h#L338

https://git.beagleboard.org/beaglev-ahead/beaglev-ahead-linux/-/blob/beaglev-v5.10.113-1.1.2/drivers/gpu-viv/hal/os/linux/kernel/gc_hal_kernel_os.c#L6144

And one more question: I was able to generate some binaries, but so far I 
don't have a clue how to assemble them to a proper image and how I would flash 
that image to the BeagleV-Ahead's eMMC. Do you happen to have some hint(s) for 
me, e.g., some link, some documentation, anything?

Best regards,
Kilian



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