A good first pass is to enable YABEL instead of native execution and watch what it does. That's how I've had to debug graphics before.
Also, if you can do a serial console only setup, you can run the VBIOS once linux is booted and try to debug it that way. It's very hard to debug a VBIOS issue as you are doing it now, however. It will take years off of your life :-) ron On Sun, Mar 22, 2015 at 9:07 AM Martin Roth <[email protected]> wrote: > My experience is that the aspeed chip based graphics card that comes with > Mohon Peak has a bug in the vbios causing it to hang when run. If you need > to use this specific card, you'll need to debug it, probably with a jtag > debugger, going through the assembly, and see what's causing the issue. My > initial guess is that they're looking for some value in the bda or ebda > that isn't present, but I'm not sure what this might be. > > Martin > > On Sun, Mar 22, 2015 at 8:45 AM, Kevin O'Connor <[email protected]> > wrote: > >> On Fri, Mar 20, 2015 at 12:30:38PM +0300, Kuzmichev Viktor wrote: >> > I tried not to include any VBIOS file in coreboot ROM much earlier, in >> my >> > first tests. With 'Run VGA Option ROMs' option checked the board just >> hung. >> > >> > And as I mentioned in my previous email VGA works fine with vendor's >> BIOS. >> > So the card itself should be fine. >> > >> > Sadly, I don't have another card to try. Even if I had, I still would >> need >> > to make this one work somehow as Mohon Peak is just a reference board >> and >> > the target board will have a similar VGA controller. >> > >> > So please, let me know if there are some other things I could try or if >> I am >> > mistaken somewhere. >> >> Hi Viktor, >> >> It seems you've tried a bunch of different configurations. However, >> this is making your trouble report hard to understand as it becomes >> unclear which config had which results. >> >> If you have an external VGA card, then please build coreboot with >> CONFIG_VGA_ROM_RUN, CONFIG_ON_DEVICE_ROM_RUN, CONFIG_VGA_BIOS, and >> CONFIG_PXE_ROM all disabled. Please use either the SeaBIOS provided >> by coreboot, or build SeaBIOS with a default config (only >> CONFIG_COREBOOT and if needed CONFIG_DEBUG_SERIAL changed from the >> seabios defaults). This is described at: >> http://www.coreboot.org/SeaBIOS >> >> In particular, there should be no "pciXXXX,YYYY.rom" or "vgaroms/XXX" >> files in your cbfs rom. >> >> If the above does not work, please use the above config and recompile >> SeaBIOS at debug level 8, and post the full debug log along with the >> output of "cbfstool print". >> >> Cheers, >> -Kevin >> >> -- >> coreboot mailing list: [email protected] >> http://www.coreboot.org/mailman/listinfo/coreboot >> > > -- > coreboot mailing list: [email protected] > http://www.coreboot.org/mailman/listinfo/coreboot
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