[U-Boot-Users] logbuffer

[Michael R. Hines]

That's exactly what I needed. Thank. Instead, however I reduced
it by exactly 16 KB, the size of the logbuffer.

Frank wrote:
> --- "Michael R. Hines" <mhines at google.com> wrote:
>
>   
>> 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...
>>>       
>
> Try reducing it on the kernel cmdline (mem=xxM) by 1Meg increments.
>
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