On Wed, 19 Mar 2025, Michael Tokarev wrote:
Hi!
Commit fc8c745d50150a63f6c "spapr: Implement Open Firmware client interface"
in Jun-2021 added a new file, pc-bios/vof-nvram.bin, to qemu sources.
But there's nothing in the sources which refers to this file, and there's
no mentions about its contents and how it has been generated.
What's the procedure to create this image? It would be great if such
procedure can be run during package build time to generate this image anew.
How it is supposed to be used?
See hw/ppc/spapr.c::spapr_create_nvram(). Looks like it would add a drive
give with -drive if=pflash,index=0 as the nvram backing file. I don't know
if it generates the default if an empty file is passed or maybe SLOF would
do that which then could be used for VOF too and that's how it was made?
So you could try running -machine spapr with an empty nvram with slof then
compare that to the default for VOF.
Should it be shipped in a downstream distribution?
If is't not auto-created with the default values and not easy to create
then maybe more convenient for users to get an example.
Regards,
BALATON Zoltan
