bugGNU GRUB - Bugs: bug #17436, Allow writes to system RAM at boot...

 
 

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bug #17436: Allow writes to system RAM at boot time

Submitted by:  Xuân Baldauf <xuan>
Submitted on:  Tue 15 Aug 2006 07:41:42 PM UTC  
 
Category: BootingSeverity: Major
Priority: 5 - NormalItem Group: None
Status: NonePrivacy: Public
Assigned to: NoneOriginator Name: 
Open/Closed: ClosedRelease: 0.97, CVS
Release: NoneReproducibility: Every Time
Planned Release: None

Sat 15 Dec 2007 09:20:06 PM UTC, comment #1:

We've moved to GRUB 2 as a development platform. Please can you check if this bug still applies there, and if it does, reopen it?

Thanks

Robert Millan <robertmh>
Project Administrator
Tue 15 Aug 2006 07:41:42 PM UTC, original submission:

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.

Xuân Baldauf <xuan>

 

Attached Files
file #10548:  grub.CVS.2006.08.15.writeMemAtBoot.v2.patch added by xuan (7KiB - text/x-patch - The patch)

 

Depends on the following items: None found

Items that depend on this one: None found

 

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  • -unavailable- added by robertmh (Posted a comment)
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    Follow 2 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sat 15 Dec 2007 09:20:06 PM UTCrobertmhOpen/ClosedOpen=>Closed
    Tue 15 Aug 2006 07:41:42 PM UTCxuanAttached File-=>Added grub.CVS.2006.08.15.writeMemAtBoot.v2.patch, #10548

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