x86, hpet: Add reference to chipset erratum documentation for disable-hpet-msi-quirk
(At the moment the "SB700 Family Product Errata" document is available at http://support.amd.com/us/Embedded_TechDocs/46837.pdf) Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> LKML-Reference: <20100517164324.GB10254@alberich.amd.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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@ -495,6 +495,9 @@ void force_hpet_resume(void)
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/*
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* HPET MSI on some boards (ATI SB700/SB800) has side effect on
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* floppy DMA. Disable HPET MSI on such platforms.
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* See erratum #27 (Misinterpreted MSI Requests May Result in
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* Corrupted LPC DMA Data) in AMD Publication #46837,
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* "SB700 Family Product Errata", Rev. 1.0, March 2010.
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*
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* Also force the read back of the CMP register in hpet_next_event()
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* to work around the problem that the CMP register write seems to be
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