Messages in this thread |  | | Date | Fri, 13 Oct 2000 13:40:36 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: A20 Gate enable sequence (setup.S) |
| |
On Fri, 13 Oct 2000, Alan Cox wrote:
> > Some boards (especially in the embedded PC area) implement only the > > latter method (some don't even _have_ a keyboard controller). > > With these boards, Linux fails to boot. > > Try the current 2.2.18pre. This has fast A20 too and I suspect will boot > on your box. Its had no problems on 2.2.18pre reported against it so far. I've > not done a 2.4 test patch but yours seems to be the sam ething > > AMD ELAN ?
The AMD/Elan box snoops for the sequence sent to the keyboard controller to enable A<20>. However, it also respects the port 0x92 control. Linux-2.2.17 doesn't have the 0x92 control so it must have been added recently.
The AMD/Elan chip also comes to life after a hardware reset with A<20> enabled. So, if you don't turn it OFF, there won't be any problem during the protected-mode transition.
Cheers, Dick Johnson
Penguin : Linux version 2.2.17 on an i686 machine (801.18 BogoMips).
"Memory is like gasoline. You use it up when you are running. Of course you get it all back when you reboot..."; Actual explanation obtained from the Micro$oft help desk.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |