On 2025.07.24 17:47, Dennis Clarke wrote:
On 7/24/25 17:24, Javier Martinez wrote:
> Dennis
>
> You have reached to the trully nightmare of embeeded devices. How
the
> hell can I boot this shoe box, I spent nearly 4 months in make
rockpi
> boot.
>
> Have you thought in specify the rootfs by device instead by uuid?
as in
> root=/dev/mmcblk0p3. If it works the trouble is that someone has not
> UUID support.
>
I am indeed feeling the pain :/
Here is what I find interesting about this bizarre little board :
1) it has 32G of DDR5 memory
2) when running the supplied Ubuntu image it is okay
2.1) the supplied Ubuntu image does boot towards GRUB
2.2) that GRUB uses a tiny grub.cfg which then points
towards a much larger grub.cfg on the root fs
3) I can flash the SiFive supplied Ubuntu onto the board
and then boot and run that just fine.
4) I can flash the Sifive supplied Yocto onto the board
and then copy/backup all of that onto SATA disk and
it will run entirely from the SATA disk just fine
My initial testing shows the SiFive P550 board is around 75% of
the speed we see in a Raspberry Pi 5. Most things. I tested with
some libGMP and libMPFR stuff and also fairly abusive IEEE-754
strict math stuff. It is about 75% the speed of the Rpi5. Sort of.
Getting Gentoo nice and lean and mean onto this thing is not entirely
a nightmare. More of a pain and frustration wherein the boot process
is a damn mystery. Poorly documented to say the least.
I also have had this board for about four months. It was dead and just
powered off for at least a month because it would not boot anything. I
had to curse and face east on a Tuesday when it was my mothers
birthday
under a full moon to get it to boot anything again. Much gnashing of
teeth as they say.
So here I am doing trial and error to figure out WTF works.
I may post updates as I proceed. At the moment I am rebuilding the
kernel with a USE flag that simply says "grub" :
file /etc/portage/package.use/installkernel says
sys-kernel/installkernel grub
That may result in nothing much. I will take a look at whatever the
Ubuntu /etc/fstab says. It baffles me. The Yocto image runs and mounts
everything just fine with this :
root@hifive-premier-p550:~# cat /etc/fstab
# stock fstab - you probably want to override this with a machine
specific one
/dev/root / auto defaults 1 1
proc /proc proc defaults 0 0
devpts /dev/pts devpts
mode=0620,ptmxmode=0666,gid=5 0 0
tmpfs /run tmpfs
mode=0755,nodev,nosuid,strictatime 0 0
tmpfs /var/volatile tmpfs defaults 0 0
# swap on the external SATA spinning disk
UUID=ab60f3c4-7658-44f9-b944-139378afc9f6 none swap sw
0 0
root@hifive-premier-p550:~#
root@hifive-premier-p550:~# cat /proc/swaps
Filename Type Size
Used Priority
/dev/sda2 partition 4194300
0 -2
root@hifive-premier-p550:~#
Well gee .... there is a bizarre /dev/root thing. I see nothing for
UUID
stuff other than swap.
* baffled *
Are any of those UUIDs in the errors present on the command line in
grub.cfg?
Are they present anywhere in the machine outside the chroot?
Is there any chance at all you did the grub-mkconfig outside the chroot?
