Alan Cox wrote:
I've acquired a new CF card that is capable of UDMA2, and with the same
connectors, wiring and adaptor (i.e. I popped out the MWDMA card and
inserted the UDMA one), I can now boot and read data on both devices
without error at reasonable speeds.
Fascinating. Does point more to a driver funny you are right. At the
moment I'm at a loss to guess what
We seem to have had a lot of reports of CF cards failing with MDMA modes recently.
Some of these reports are because of SATA<>PATA bridge chips that don't support MDMA,
others are due to unknowns.
The solution is beginning to look more and more obvious: default to not use MDMA
modes for CF devices at boot. And eventually provide a sysfs or libata parameter
(or support/snoop SET_XFER_MODE) to change the mode later.
Cheers
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