RE: ACPI: RSDP - ERROR: Invalid checksum

Moore, Robert
2005-07-01T20:51:45Z

The actual ACPI CA core will continue until it finds a valid "RSD PTR "
string with a valid table checksum, since at least 11/2004:

19 November 2004. Summary of changes for version 20041119:

Modified the RSDP memory scan mechanism to support the extended
checksum for ACPI 2.0 (and above) RSDPs. Note that the search
continues until a valid RSDP signature is found with a valid
checksum.

Unfortunately, I believe that Linux still has two versions of the RSDP
memory scan code, and the "other" version (not within the ACPI CA core)
continues to be down-revved and incorrect.

We really need to get rid of the "other" version so that there is only
one version of this important code.

Bob

> -----Original Message-----
> From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:acpi-devel-
> admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Moore, Robert
> Sent: Tuesday, June 28, 2005 8:20 AM
> To: Klaus Muth; acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Subject: RE: [ACPI] ACPI: RSDP - ERROR: Invalid checksum
>
> Does this work under windows?
> Please post a memory dump of the area in question, I would be very
> interested to see it.
> Bob
>
>
> > -----Original Message-----
> > From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:acpi-devel-
> > admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Klaus Muth
> > Sent: Tuesday, June 28, 2005 12:25 AM
> > To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> > Subject: Re: [ACPI] ACPI: RSDP - ERROR: Invalid checksum
> >
> > Am Donnerstag, 9. Juni 2005 11:13 schrieb Klaus Muth:
> >
> > > It seems to happen, that the IBM BIOS contains just the string
"RSD
> PTR
> > "
> > > exactly at a 16-Byte-Boundary before the real RSDP block, so the
> wrnog
> > > address is returned and acpi_table_init() in drivers/acpi/tables.c
> fails
> > to
> > > checksum this block of course.
> > [... 2.4 kernel finding the real RSDP ...]
> > > Is there any patch to do the same with a vanilla 2.6 Kernel?
> >
> > Ahem. Did I hit a FAQ? If so: I could not find the answer. Could
just
> > someone
> > be so kind to point me in the right direction?
> >
> > TIA
> > --
> > Klaus Muth
> > HAGOS eG Industriestr. 62 fon: (+49) 711
> 78805-
> > 86
> > EDV-Programmierung 70565 Stuttgart fax: (+49) 711
> 78805-
> > 35
> > http://www.hagos.de Germany
> > mailto:muth-5lHx5lHeYlQ@public.gmane.org
> >
> >
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