[bugs #509] bad Gate A20 handling

[Peter Missel]

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 of the project: GNU GRUB.

/**************************************************************************/
[bugs #509] Latest Modifications:

Changes by: 
                Peter Missel <address@hidden>
'Date: 
                Mon 10/04/2004 at 08:17 (GMT)

------------------ Additional Follow-up Comments ----------------------------
I beg your pardon? I report a bug and you close the issue because there are no 
bugs?

Let me rephrase: The current Int15h handler in GRUB does not work for boards 
that do not have an A20 gate at all, because these boards report "no A20 gate 
switching method available" through Int15h. Furthermore, GRUB then falls back 
to KBC direct access, and hangs infinitely because these boards inherently do 
not have a KBC either.

Do you want to hear our suggestion on how to fix that?






/**************************************************************************/
[bugs #509] Full Item Snapshot:

URL: <http://savannah.gnu.org/bugs/?func=detailitem&item_id=509>
Project: GNU GRUB
Submitted by: Yoshinori K. Okuji
On: Fri 05/31/2002 at 00:39

Category:  Booting
Severity:  Critical
Priority:  3 - Low
Item Group:  Software Error
Resolution:  Fixed
Privacy:  Public
Assigned to:  okuji
Originator Name:  
Originator Email:  
Status:  Closed
Release:  0.92
Reproducibility:  Every Time
Planned Release:  0.93


Summary:  bad Gate A20 handling

Original Submission:  The current Gate A20 code doesn't work properly in
all systems. See this thread for more information:

http://www.mail-archive.com/bug-grub%40gnu.org/msg05798.html

Okuji

Follow-up Comments
------------------


-------------------------------------------------------
Date: Mon 10/04/2004 at 08:17       By: Peter Missel <pmissel>
I beg your pardon? I report a bug and you close the issue because there are no 
bugs?

Let me rephrase: The current Int15h handler in GRUB does not work for boards 
that do not have an A20 gate at all, because these boards report "no A20 gate 
switching method available" through Int15h. Furthermore, GRUB then falls back 
to KBC direct access, and hangs infinitely because these boards inherently do 
not have a KBC either.

Do you want to hear our suggestion on how to fix that?

-------------------------------------------------------
Date: Tue 09/21/2004 at 15:35       By: Yoshinori K. Okuji <okuji>
I implemented INT 15h support a long time ago, and I hear no bug report on 
this. So I close this bug.

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Date: Mon 08/30/2004 at 09:28       By: Peter Missel <pmissel>
Greetings!

We're currently prototyping a system mainboard that does not have a KBC, and 
promptly have observed GRUB to run into this issue.

We've been implementing Int15h 240x functions, and could think of an improved 
algorithm in GRUB that makes better use of them - particularly in case the 
system does not have a method of switching the A20 gate at all. This is the 
case in systems that follow the MS "Legacy Free" initiative - A20gate is always 
open, and there's no method of closing it at all.

Please let us know how we can participate in getting GRUB to run on these 
systems.

regards,
Peter

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Date: Sun 11/30/2003 at 16:47       By: Yoshinori K. Okuji <okuji>
I did some changes on this bug a long time ago, and I have never heard the same 
problem for a while. So I lower the priority, but not closing it, so that I 
wouldn't forget it.

Okuji




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