[coreboot] C720 - ROM file

Aaron Durbin adurbin at chromium.org
Tue Feb 4 16:22:29 CET 2014

On Tue, Feb 4, 2014 at 9:12 AM, Carmelo Ingrao <carmelo at ingrao.fr> wrote:
> Hi Aaron, first thanks to take the time to answer :)
> Le 4 févr. 2014 à 16:03, Aaron Durbin <adurbin at chromium.org> a écrit :
>> SeaBIOS was loading correctly until you changed the GBB flags, right?
>> And CTRL+L is just not being detected any longer? Can you change the
>> GBB flags back and determine if the legacy booting still works?
> Yes, before doing mess with the gbb flags, the SeaBIOS was correctly working : I have once installed Fedora on my c720
> Now CTRL+L is no longer detected (only a sound out the speakers)
> Yes I can change the GBB flags, but which one do I have to set ?

I was thinking changing them back to 0x00, but it sounds like you
installed Fedora over ChromeOS? And it was working until you changed
the gbb flags?

>>> I have read online it may be caused by the wipe of SeaBIOS part in the
>>> ROM.
>> It's possible. Since you are in dev mode, could you run the following?
>> ' iotools mmio_dump 0xffc00000 0x200000 -b | hexdump -C' It will dump
>> the contents of legacy portion of the flash. We'd know for certain if
>> the area is wiped.
> I have copy/paste your command, and here is what I obtain :
> localhost / # iotools mmio_dump 0xffc00000 0x200000 -b | hexdump -C
> bash: iotools: command not found

Sorry. I thought you were booting ChromeOS in dev mode (I'm just used
to using iotools). Try this:

dd iflag=sync if=/dev/mem bs=2M skip=2046 count=1 | hexdump -C


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