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

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Kilian,

On Thu, 10 Aug 2023 11:20:49 +0200
Kilian Zinnecker <kilian.zinnecker@mail.de> wrote:

> > Ah, ah, I was working on this as well!  
> 
> Nice, then let's do it together?

Sure, why not. You seem to be ahead of me already, so let me know when
you have something and I can give it a test. Or if you face some issue,
I can have a look and try to help.

> > Backport commit 1dde977518f13824b847e23275001191139bc384 from upstream
> > U-Boot on top of this vendor branch, it will solve your problem.  
> 
> Great, thanks, that did the trick!

I know, because I already encountered this exactly same problem while
trying to build U-Boot for the BeagleV-Ahead :-)

> I however run into a similar problem with opensbi afterwards. As I use the 
> beaglev_defconfig as basis, I also used the opensbi version defined there:
> 
> https://gitlab.com/buildroot.org/buildroot/-/blob/3a4ce27f/configs/
> beaglev_defconfig#L29

I'm not sure it makes sense to use the same OpenSBI version as the one
that was used for the original BeagleV. You probably want to check the
Yocto layers for the BeagleV-Ahead to see which OpenSBI
version/configuration they are building.

> However, the (2 years old) opensbi version (currently defined in the 
> beaglev_defconfig) does not define the neccessary flags for the zicsr and 
> zifencei extensions, needed by gcc12, as seen here in the newer opensbi 
> release-1.3.x version:
> 
> https://github.com/riscv-software-src/opensbi/blob/release-1.3.x/Makefile#L274
> 
> So my build broke until I changed to release-1.3.x. This makes me wonder about 
> the current beaglev_defconfig: It might be broken since bumbing gcc to v12, but 
> I actually don't know. I could try building an image for the beaglev later 
> today?

The beaglev_defconfig indeed fails to build in U-Boot:
https://gitlab.com/buildroot.org/buildroot/-/jobs/4839059972

However, I think beaglev_defconfig should probably be removed, this
board is not produced.

> Now, regarding the bealgev-ahead, it seems to build opensbi on my machine. But 
> I don't know whether the official opensbi is actually needed, or the custom 
> version, i.e.:
> 
> https://git.beagleboard.org/beaglev-ahead/beaglev-ahead-opensbi

See
https://git.beagleboard.org/beaglev-ahead/xuantie-yocto/-/tree/Linux_SDK_V1.1.2-light-beagle/meta-light/recipes-bsp/opensbi
for how they are building OpenSBI.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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