[flashrom] Need help with failed flash. part 2.1

[Stefan Tauner]

On Tue, 13 Nov 2012 11:33:32 +0100
Simon Riget <simon at paragi.dk> wrote:

> Biso was flashed with backup and are hopefully restored.
> 
> 
> flashrom -p internal -V: http://paste.flashrom.org/view.php?id=1442
> lspci -nnvvvxxx: http://paste.flashrom.org/view.php?id=1443
> superiotool -deV : http://paste.flashrom.org/view.php?id=1444
> flashrom -p internal -r readout.rom: 
> http://paste.flashrom.org/view.php?id=1445

as discussed on IRC it is believed that the chip's "boot block lockout"
is enabled and not possible to be disabled by software and that it is
safe to update the bios by only writing to the unprotected parts.

flashrom supports writing arbitrary address ranges out of the box
(reading, verifying and erasing support has not been merged though).
to do so one has to tell flashrom the flash "partition table" with the
help of a layout file. please consult the manpage about the details for
example how to select an address range to operate on.

your layout file should look like this:
00000000:0003bfff main
0003c000:0003ffff bootblock

and you want to flash the main part only. presuming that the layout
file is named "layout.txt", you will probably want to execute something
like this:

flashrom -p internal -V -l layout.txt -i main -w <imagename>
it should say verified at the as you have seen already. if it does not
for any reason, but tell you the "unknown state" message, please write
the backup again. you should always be able to go back to this safe
state, as long as you dont reboot.

if it says verified then the new contents mixed with the old bootblock
are written correctly. as i explained to you we are not 100% sure that
his is a legit state, but have little doubt and you can reboot then.

-- 
Kind regards/Mit freundlichen Grüßen, Stefan Tauner