Pioneer boot process

Pioneer
1

Hi,
I’m trying to port a new distro to the Pioneer board – unfortunately except for the prebuilt OS images that could be reverse engineered, I couldn’t find any documentation on the boot process.

The Fedora image seems to have something resembling a UEFI partition (but without the typical ef00 marker in the partition table), containing a fip.bin and zsbl.bin, a RISC-V grub binary without a config, and a kernel image as a UEFI binary; and then there’s another boot partition that looks like something u-boot would like to see (extlinux configs and all).

That seems a bit duplicated (and possibly still not enough because there may be some special offset zsbl, opensbi etc. must be copied to) - is there any documentation on the actual boot process?

Thanks
bero

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2

Hi,

On the phone and supposed to sleep rn, so bit of a short answer - but maybe helps as a pointer already

The boot process works around the first partition being a FAT32 from which the fip.bin is loaded, which is the firmware bringing up the memory and rest of the system and then loading I guess the zsbl.

This has some more, maybe that helps: https://github.com/sophgo/sophgo-doc/blob/main/SG2042/HowTo/bootflow.rst

3

Thanks, that’s very useful. Is the source for fip.bin available somewhere, or is it a binary that must be copied around?

4

Binary file, sadly

Having that open would have helped a lot in diagnosing the boot problems all around the forum^^`

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5

I created some issues in the sophgo repos asking for more information about fip.bin:

Based on documentation from some of their other systems it seems like it might be generated from the u-root trees somehow.

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