[coreboot] C720 - ROM file

[Carmelo Ingrao]

Le 4 févr. 2014 à 16:22, Aaron Durbin <adurbin at chromium.org> a écrit :

> 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?

First, I had ChromeOS
Then I installed Fedora
Then I reinstall ChromeOS (no more Fedora), and at this moment I played with 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

Yes I have right now ChromeOS in dev mode but it can’t find the iotools (when I start the laptop it says « press space to enable security)

Here the output :

localhost / # dd iflag=sync if=/dev/mem bs=2M skip=2046 count=1 | hexdump -C
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
1+0 records in
1+0 records out
2097152 bytes (2.1 MB) copied, 1.30793 s, 1.6 MB/s
00200000


Carmelo

> 
> -Aaron