Re: [PATCH v1 0/6] google firmware support

From: Greg KH
Date: Tue Jan 25 2011 - 21:53:18 EST

On Tue, Jan 25, 2011 at 11:58:27AM -0800, Mike Waychison wrote:
> On Mon, Jan 24, 2011 at 7:01 PM, Greg KH <greg@xxxxxxxxx> wrote:
> > On Mon, Jan 24, 2011 at 04:24:34PM -0800, Mike Waychison wrote:
> >>
> >>    - [5] prepares for [6] by introducing prepend_to_dmesg() which
> >>      allows drivers to prepend pre-kernel messages to the dmesg at
> >>      bootup.
> >
> > That seems "rude".  Why can't you just pick out from the kernel log the
> > data you need when it gets printed?  This seems like you feel your code
> > should always get a "First Post!" message.
> Well, the use case we have is that we prepend all the bios output (and
> anything emitted by option roms and boot loaders via int 10h). This
> typically runs in the 100+ lines of output.
> Basically, everything the user sees on the console after power up is
> available to him in the dmesg. We did this out of convenience as it
> makes for a good looking log :)

That's a nice goal, but I don't think the kernel log is the proper place
for this.

> That said, it's dmesg, and we don't build automation on anything in
> there if we can help it. I can move this memory console dump
> elsewhere (/sys/firmware/log ?)

Yes, /sys/firmware/log would be a great place for it. Make it a binary
sysfs file, and just dump the firmware data right into it, not having
the kernel do anything with it at all.

Oh, and document the thing in Documentation/ABI please, so that other
platforms can take advantage of this interface as well in the future.

nice idea,

greg k-h
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