On 27/09/07 16:27 -0700, H. Peter Anvin wrote:
> Jordan Crouse wrote:
> > On 27/09/07 15:47 -0700, H. Peter Anvin wrote:
> >> Jordan Crouse wrote:
> >>> Breaks on the Geode - original behavior.
> >>>
> >>> I think that having boot_prams.e820_entries != 0 makes the kernel
> >>> assume the e820 data is correct.
> >>>
> >> Okay, now I'm utterly baffled how 2.6.22 ever worked on this Geode,
> >> because this, to the best of my reading, mimics the 2.6.22 behavior
> >> exactly. DID IT REALLY, and/or did you make any kind of configuration
> >> changes?
> >
> > I copied in a 2.6.22 kernel to see that it really did work, and it did.
> > But here's the crazy part - I did a dmesg, and it looks like it
> > *is* using e820 data, and it looks complete (I see the entire map -
> > including the ACPI and reserved blocks way up high).
> >
> > So apparently it was the 2.6.22 code that was buggy, but reading it,
> > I don't immediately see how.
> >
>
> Oh bugger, looks like this one might be genuinely my fault after all.
> The ID check in the new code is buggy.
>
> Can you please test this revised patch out (against current -git)?
> -hpa
>
>
>
> diff --git a/arch/i386/boot/memory.c b/arch/i386/boot/memory.c
> index bccaa1c..84939b7 100644
> --- a/arch/i386/boot/memory.c
> +++ b/arch/i386/boot/memory.c
> @@ -34,17 +34,7 @@ static int detect_memory_e820(void)
> "=m" (*desc)
> : "D" (desc), "a" (0xe820));
>
> - /* Some BIOSes stop returning SMAP in the middle of
> - the search loop. We don't know exactly how the BIOS
> - screwed up the map at that point, we might have a
> - partial map, the full map, or complete garbage, so
> - just return failure. */
> - if (id != SMAP) {
> - count = 0;
> - break;
> - }
> -
> - if (err)
> + if (id != SMAP || err)
> break;
>
> count++;
That looks the same as the previous patch you sent?
Jordan
--
Jordan Crouse
Systems Software Development Engineer
Advanced Micro Devices, Inc.
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