From: Alan Cox <alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
To: Andrew Morton <akpm-3NddpPZAyC0@public.gmane.org>
Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
"Udo A. Steinberg"
<us15-IG//nw+yl+iQIjdd1DhZXWfrygkm6VTR@public.gmane.org>
Subject: Re: Fw: [PATCH]: Correctly locate RSDP in EBDA
Date: Tue, 26 Jul 2005 10:53:57 +0100 [thread overview]
Message-ID: <1122371637.1101.12.camel@localhost.localdomain> (raw)
In-Reply-To: <20050725151313.730257bd.akpm-3NddpPZAyC0@public.gmane.org>
On Llu, 2005-07-25 at 15:13 -0700, Andrew Morton wrote:
> * Scan memory looking for the RSDP signature. First search EBDA (low
> * memory) paragraphs and then search upper memory (E0000-FFFFF).
> */
> - rsdp_phys = acpi_scan_rsdp (0, 0x400);
> + rsdp_phys = acpi_scan_rsdp (*(u16*) 0x40E << 4, 0x400);
Close but no cookie. You need to read 0x40E from physical memory not
kernel virtual address space. It may also be zero which indicates that
there isn't an EBDA, sometimes interpreted as an EBDA in the top 1K or
so.
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next prev parent reply other threads:[~2005-07-26 9:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-25 22:13 Fw: [PATCH]: Correctly locate RSDP in EBDA Andrew Morton
[not found] ` <20050725151313.730257bd.akpm-3NddpPZAyC0@public.gmane.org>
2005-07-26 9:53 ` Alan Cox [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-07-25 22:19 Moore, Robert
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