[coreboot] [GSOC 2016] Coreboot panic room

Denis 'GNUtoo' Carikli GNUtoo at no-log.org
Mon May 16 18:08:06 CEST 2016


On Thu, 10 Mar 2016 22:34:45 +0000
Antonello Dettori <dev at dettori.io> wrote:

> Hello everyone,
Hi,

> I would like to concentrate most of my efforts towards improving and 
> upstreaming the previous efforts, implementing a way to easily access 
> the recovery mode when needed and further the integration between 
> coreboot, serialICE and flashrom for this use-case.
> 
> Regarding the existing patches I would like to know if they would
> need to stay romc-compatible or should the scope be limited to CAR
> boards?
How was it implemented?

I see several building blocks:
- nvramtool and the fallback/normal mecanism.
- Many hardware also do have watchdogs, but I believe it's disabled by
  coreboot.
- SerialICE: I'm not sure it can work from coreboot, or how to
  integrate it in the same flash. Patches to add some kind of support
  for it in coreboot might exist in gerrit.
- libhwremote: works with SerialICE, and was made to work with pciutils
  and superiotool
- Coreboot also has gdb support, and even something like gdbwait, but
  only in ramstage.
- Coreboot also has some code to write to some flash chips, in order to
  store its logs there.

Denis.
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