Messages in this thread |  | | Date | Sat, 6 Jun 2009 15:56:36 +0100 | From | Alan Cox <> | Subject | Re: Kernel 2.6.30rc7 limits IDE to UDMA33 |
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> I wouldn't rule out the possibility of a bug. The code in pata_via looks > a bit fishy, it reports a 40-wire cable if either the GTM data wasn't > present or valid, or if it reports a mode of UDMA2 or less. In the > former case it seems like ATA_CABLE_PATA_UNK would be the safer choice > since we really don't know, and we should then use drive-side detection, > rather than assuming a 40-wire cable by default..
Drive side detection doesn't work for many VIA boards, the neccessary components are not included.
About the only other check I can think to try is to see if the BIOS programmed modes > UDMA2 for either device. That has its own problems (suspend-resume/hotplug/non-bios devices) which is why we currently don't do it.
Alan
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