Bean <[EMAIL PROTECTED]> writes: > On Wed, Jun 25, 2008 at 4:38 AM, Javier Martín <[EMAIL PROTECTED]> wrote: >> El mié, 25-06-2008 a las 04:11 +0800, Bean escribió: >>> 2. Macbook will halt if we disable a20, so I add a new option >>> --keep-a20 to keep the a20 gate open. >> Does any OS fail to boot if it has A20 enabled when it is jumped to? >> AFAIK some BIOS even had an option to enable it at POST time, so I think >> we should make this new option the default and have an option called >> "--reset-a20" or something like that. > > I don't know of any os that would fail if a20 is enabled. Normally, > they try to enable it as soon as possible as they need to access upper > memory. So making it default is not a bad idea.
It's disabled for legacy reasons. Some old DOS applications expect addresses to wrap around. And thus a20 gate should be disabled. -- Marco _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
