Subject: Re: Issue with /usr/src/sys/arch/i386/stand/lib/gatea20.c
To: Marcin Jessa <email@example.com>
From: Perry E. Metzger <firstname.lastname@example.org>
Date: 06/21/2005 16:47:32
David Laight <email@example.com> writes:
>> No I have not but I will now. Thanks Jukka.
>> But if it works, why the heck isn't it commited?
> Because the code that is there was added for a reason - probably to
> make some other motherboard work properly.
In fact, there are a very large number of boards that require (or used
to require) the Gate A20 hack.
> Unless and until you understand the full ramifications of such a
> change, you are likely to break the boot code on some other
> The A20 gate is a horrid hack, and it is probably difficult to find any
> reasonable amount of documentation about it.
What we might do is explicitly check whether or not the device is
there before hitting gate A20, but on the other hand I don't know if
there is an easy way to do that.
Perry E. Metzger firstname.lastname@example.org