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SubjectSB600 64-bit DMA BIOS misconfiguration (formerly RE: [PATCH 2.6.34] ehci-hcd: add option to enable 64-bit DMA support)

> it doesn't work. Based on the libata experience with AHCI which has a
> similar 64-bit feature flag, there are some controllers that didn't do
> it properly, but not many (only ATI SB600 it appears, and only on
> certain boards, as it seems it was a BIOS configuration issue).
It seems it was solved by a DMI whitelist, but if it is a BIOS configuration issue, I think it would be better if it could be detected directly instead by reading the configuration directly from the device and correcting it if possible. Is that possible?

Yuhong Bao

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