Re: [coreboot] C720 - ROM file

[Carmelo Ingrao]

Le 4 févr. 2014 à 16:22, Aaron Durbin  a écrit :
> On Tue, Feb 4, 2014 at 9:12 AM, Carmelo Ingrao  wrote:
> > Hi Aaron, first thanks to take the time to answer :)
> >
> > Le 4 févr. 2014 à 16:03, Aaron Durbin  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

C720 - ROM file

[Aaron Durbin]

On Tue, Feb 4, 2014 at 9:26 AM, Carmelo Ingrao  wrote:
> Le 4 févr. 2014 à 16:22, Aaron Durbin  a écrit :
> > On Tue, Feb 4, 2014 at 9:12 AM, Carmelo Ingrao  wrote:
> > > Hi Aaron, first thanks to take the time to answer :)
> > >
> > > Le 4 févr. 2014 à 16:03, Aaron Durbin  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.

Got it. It's clearer now.
> > > > > 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

It definitely is gone, but I am not sure why.

I would use the script Kevin posted in
http://permalink.gmane.org/gmane.comp.bios.coreboot.seabios/7572 to
build a new SeaBIOS and flash it to the RW_LEGACY in the SPI. The
script looks to be well documented and straight forward.

-Aaron