Messages in this thread Patch in this message | | | Subject | Re: another Cyrix/mtrr problem? | From | David Wragg <> | Date | 14 Mar 2001 22:57:21 +0000 |
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rct@gherkin.sa.wlk.com (Bob_Tracy) writes: > Unfortunately, when I execute > > echo "base=0xd8000000 size=0x100000 type=write-combining" >| /proc/mtrr > > I get a 2MB region instead of the 1MB region I expected...
Oops, it got broken by the MTRR >32-bit support in 2.4.0-testX. The patch below should fix it.
Joerg, I think this might well fix your Cyrix mtrr problem also.
Let me know how it goes, Dave Wragg
diff -uar linux-2.4.2/arch/i386/kernel/mtrr.c linux-2.4.2.cyrix/arch/i386/kernel/mtrr.c --- linux-2.4.2/arch/i386/kernel/mtrr.c Thu Feb 22 15:24:53 2001 +++ linux-2.4.2.cyrix/arch/i386/kernel/mtrr.c Wed Mar 14 22:28:02 2001 @@ -538,7 +538,7 @@ * Note: shift==0xf means 4G, this is unsupported. */ if (shift) - *size = (reg < 7 ? 0x1UL : 0x40UL) << shift; + *size = (reg < 7 ? 0x1UL : 0x40UL) << (shift - 1); else *size = 0; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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