Re: Anyone kicked at the SiFive P550 ?

Perhaps a long shot, but it looks like there's a micro SD slot on the board, which in my experience tends to be better supported by vendor uboot than USB. Odds are decent the USB stack won't work out of the box anyways on FreeBSD right now, so it would seem like an sd/mmc would have a better chance of a successfully loaded kernel finding a filesystem. 

You haven't said much about exactly what you've been trying beyond mentioning USB, so I don't know what you'd consider obvious. But my first instinct would be to try adapting the process several of us have used to boot on the VisionFive 2, originally written up by Rob Norris AFAIK: https://github.com/robn/freebsd-vf2. You should be able to just swap a newer image (some snapshot of 15-CURRENT) into that script and find the correct DTB for the board (probably from SiFive's Ubuntu media) and swap that in. No guarantee of course that the DTB isn't full of new vendor tweaks that aren't recognized yet by FreeBSD drivers, but this seems like the place to start if you haven't already tried something similar. It should at least get the kernel booting far enough to hit some other problem.

If booting from the memory disk works, then you can try mounting the actual SD card, and if that works then you could try booting without the memory image (but still loading the new DTB).

-Colin

On Fri, Mar 14, 2025, at 08:44, Dennis Clarke wrote:
> On 3/8/25 15:20, Dennis Clarke wrote:
> > 
> > Just a dumb question from the outskirts of sanity here :
> > 
> >      https://www.genunix.com/dclarke/riscv/p550_running.png
> > 
> > Has anyone tried to do anything with FreeBSD on this ... thing ?
> > 
> 
>      A few days later .... nothing but silence. Crickets.
> 
>      I have been trying to get the thing to boot from the USB port using
> a 15.0-CURRENT memstick image but the UBOOT stuff is baffling.
> 
>      If anyone wants to give it a whirl then I am happy to provide the
> serial console access and whatever .. to the right people of course.
> 
> 
> 
> 
> -- 
> --
> Dennis Clarke
> RISC-V/SPARC/PPC/ARM/CISC
> UNIX and Linux spoken
> 
>