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[bug #17436] Allow writes to system RAM at boot time
From: |
Xuân Baldauf |
Subject: |
[bug #17436] Allow writes to system RAM at boot time |
Date: |
Tue, 15 Aug 2006 19:41:43 +0000 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.6) Gecko/20060728 SUSE/1.0.4-2.1 SeaMonkey/1.0.4 |
URL:
<http://savannah.gnu.org/bugs/?func=detailitem&item_id=17436>
Summary: Allow writes to system RAM at boot time
Project: GNU GRUB
Submitted by: xuan
Submitted on: Dienstag 15.08.2006 um 19:41
Category: Booting
Severity: Major
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Release: 0.97, CVS
Reproducibility: Every Time
Planned Release:
_______________________________________________________
Details:
For correcting some BIOS bugs, it is necessary to write to system RAM as
early as possible.
A tangible example is a notebook computer which has an exchanged TFT display
(because the old one got broken). A broken BIOS might not recognize such a
TFT display correctly and this writes wrong data into system memory.
Operating systems and graphics drivers depend on such data. If the data is
correct, they can correctly initialize the TFT display. If the data is not
correct, they cannot.
The attached patch makes it possible to write arbitrary values into system
memory at boot time. It is highly experimental (and should be discussed and
enhanced), but it is absolutely safe if the new grub shell commands "write"
and "write16" are not used.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Dienstag 15.08.2006 um 19:41 Name:
grub.CVS.2006.08.15.writeMemAtBoot.v2.patch Size: 6,58KB By: xuan
The patch
<http://savannah.gnu.org/bugs/download.php?file_id=10548>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?func=detailitem&item_id=17436>
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