Followup to: <[EMAIL PROTECTED]>
By author:Alan Cox <[EMAIL PROTECTED]>
In newsgroup: linux.dev.kernel
>
> > This doesn't really work. Neither the fast A20 gate nor the KBC is
> > guaranteed to have immediate effect (on most systems they won't.)
>
> Fast A20 gate happens to be immediate on
> This doesn't really work. Neither the fast A20 gate nor the KBC is
> guaranteed to have immediate effect (on most systems they won't.)
Fast A20 gate happens to be immediate on all the embedded kit I know so its
probably acceptable, and if its too slow it still does the kbc timeout. Since
its g
Followup to: <00110621255000.12156@rob>
By author:Robert Kaiser <[EMAIL PROTECTED]>
In newsgroup: linux.dev.kernel
>
> On Mon, 06 Nov 2000 you wrote:
> H. Peter Anvin wrote
> > I just looked at the code, and it's worse than I first thought: if
> > memory location 0x200 happens to contain 0x00
On Mon, 06 Nov 2000 you wrote:
H. Peter Anvin wrote
> I just looked at the code, and it's worse than I first thought: if
> memory location 0x200 happens to contain 0x0001 when the kernel is
> entered, this code with loop indefinitely.
Ooops, you're right !
How about this one:
diff -ur linux-2
Followup to: <00110620483000.11673@rob>
By author:Robert Kaiser <[EMAIL PROTECTED]>
In newsgroup: linux.dev.kernel
>
> > This doesn't really work. Neither the fast A20 gate nor the KBC is
> > guaranteed to have immediate effect (on most systems they won't.)
>
> In that case, maybe I should
Followup to: <00110618083400.11022@rob>
By author:Robert Kaiser <[EMAIL PROTECTED]>
In newsgroup: linux.dev.kernel
>
> The attached patch fixes this by doing "fast A20" enable first and then
> checking if A20 already is enabled. If it is, the keyboard controller sequence
> is skipped. This w
> This doesn't really work. Neither the fast A20 gate nor the KBC is
> guaranteed to have immediate effect (on most systems they won't.)
In that case, maybe I should do repeated calls to a20_check with a
(not too big) retry count after the port 92 write ?
Problem is, it happens to work this way
Followup to: <00110618083400.11022@rob>
By author:Robert Kaiser <[EMAIL PROTECTED]>
In newsgroup: linux.dev.kernel
>
> Hi all,
>
> a while ago, I posted a request here to add the "fast A20" enable
> sequence to setup.S in order to enable booting Linux on boards that
> don't have a keyboard c
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