[ELDK] TQM5200: IDE not in UDMA mode, hdparm not working

Detlev Zundel dzu at denx.de
Wed Aug 10 14:40:06 CEST 2011

Hi Marc,

> Is it possible to use the IDE-Interface in UDMA2 mode with the TQM5200?

As far as I can remember, there were always problems reported on the
PowerPC mailing list in connection to using ATA with DMA modes
(e.g. [1]).  Our latest experiences with 5200B shows that you may be
able to get around the problems by disabling bestcomm prefetching and
XLB snooping altogether.  Yes, I know what that does to performance ;)


> Is this a kernel config issue, or a mismatch Denx-Kernel /
> Debian-hdparm, or is it just not possible with the TQM5200?

In the meantime all of our relevant changes have been merged into
upstream, so you should try with the latest and greatest kernel from
mainline and report problems on the regular PowerPC mailing list:

"PowerPC developers ML" <linuxppc-dev at ozlabs.org>

Best wishes

[1] http://article.gmane.org/gmane.linux.ports.ppc64.devel/50509

Math and Alcohol don't mix, so...

[Motto of the society: Mathematicians Against Drunk Deriving]
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