Re: [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk uponpanic

[Jeff Garzik]

On 01/25/2011 05:16 PM, Randy Dunlap wrote:
> On Tue, 25 Jan 2011 17:10:49 -0500 Mark Lord wrote:
>
> > On 11-01-25 12:05 PM, Ahmed S. Darwish wrote:
> > > My current x86 laptop includes the very common ATA PIIX controller.
> >
> >
> > ata_piix is just about ideal for this sort of thing.
> >
> > Except, don't use the BIOS to write the logs,
> > but rather code/use a very simple set of polling-PIO
> > functions to talk directly through the PIIX to the drive.
> >
> > Really really simple code to do that, and it would likely
> > work with anything ata-piix, and most other non-AHCI chipsets too.
> >
> > Not perfect, but probably good enough for a lot of scenarios.
> > The old hd.c driver shows how to read/write a sector at a time,
> > and that kind of code is easily converted to simply poll for completion.
>
> I don't know how/where to find it, but Rusty Russell had a version of this
> many, many years ago.

You beat me to the reply :)

http://lwn.net/Articles/9905/

but IIRC there were updates and improvements.

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