[U-Boot-Users] logbuffer

Frank frannk_m1 at yahoo.com
Fri Jun 30 06:12:14 CEST 2006

--- "Michael R. Hines" <mhines at google.com> wrote:

> I'd like to use the logbuffer functionality in u-boot...
> After #define'ing CONFIG_LOGBUFFER, I can
> successfully see our data getting printed to the reserved
> 16K region in dram. However, we want to grab that data
> back out after linux has booted.
> During the various initializations that linux does on boot,
> (somewhere before init is actually run, I believe), the data
> in the 16K buffer at the end of dram gets over-written
> by somebody inside linux, and is lost.
> I found a thread somewhere on the net where Wolfgang
> mentioned that linux needed a patch to be told not to
> intrude on those logbuffer pages, but nothing more than
> that.
> Is there a proper way to handle this?
> Thanks,
> - Michael R. Hines

I've never used the log buffer before, but I would think you
could just tell the kernel you have less memory then is
physically there. That way the kernel wouldn't touch the area
used by the log buffer...

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