[U-Boot-Users] logbuffer

Michael R. Hines mhines at google.com
Fri Jun 30 06:56:03 CEST 2006

That's what my first attempt tried to do, but it didn't seem to work.

I reduced mem_size (I think) inside the bd_info struct by 16K.

Just curious if there was a more properly intended way of going about it...

- Michael

Frank wrote:
> --- "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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