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SubjectRe: [ACPI] Re: mem= option for broken bioses
From
On Thu, Feb 27, 2003 at 04:19:07PM +0100, Pavel Machek wrote:
> Hi!
>
> > >>OK, looks reasonable. Can you also gen up a patch documenting this in
> > >>kernel-parameters.txt?
> > >>
> > >>
> > >
> > >You can, assuming you took the patch ;-).
> > >
> > >
> > well how can i find the correct value`s to put in ??
>
> Well, similar method to how you use mem=123@456 parameters. You just
> guess them. [Given kernel messages, it is actually quite easy.]
>

If I understand you, you then just have to mem= with the correct
value reported via, for example:

ducrot@novae:~$ dmesg | grep 'ACPI data'
BIOS-e820: 000000000fef0000 - 000000000feff000 (ACPI data)

Interresting :)

Ok. Here is actually a method:
A phoenix bios (and you have one) will reserved typically 64ko
for ACPI data below ACPI NVS.

ducrot@novae:~$ dmesg | grep -i 'ACPI NVS'
BIOS-e820: 000000000feff000 - 000000000ff00000 (ACPI NVS)
ducrot@novae:~$ python
Python 2.1.1+ (#1, Jan 8 2002, 00:37:12)
[GCC 2.95.4 20011006 (Debian prerelease)] on linux2
Type "copyright", "credits" or "license" for more information.
>>> 0x000000000feff000 - 65536
267317248

If my bios will be incorrect, I will then pass
mem=267317248#65536
and voila.


But big problem though. It is really really strange that the
BIOS mainteners have broken e820 call, are you sure you have
enabled acpi in BIOS, and/or power management ?

Cheers,

--
Ducrot Bruno

-- Which is worse: ignorance or apathy?
-- Don't know. Don't care.
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