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List:       linux-arm-kernel
Subject:    Forcing PIO Mode on IDE
From:       "Thomas E. Besemer" <tbesemer () tbcorp ! com>
Date:       2004-10-06 18:13:34
Message-ID: MKEPJNALGBMOOLJPBOCOCELOEBAA.tbesemer () tbcorp ! com
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Does anybody know how to force PIO mode on IDE?  I am working with
IXP425, SnapGear 3.1.1, 2.4.24 release.  I am using the HPT371, which
has some troubles using DMA on the hardware I am working with.  What
I'd like to do is just force PIO - the connected device (disk) is a
Compact Flash device, and performance is not an issue.

I updated hpt366.h to change from AUTODMA to NODMA, but then the
kernel panics during start, with a null pointer problem.  I think
what is happening is that I did disable DMA on device, but kernel
does not know about this.  If I turn of DMA with xconfig for IDE, then I
cannot configure the HPT3xx in in.

Any help appreciated.

Thanks,

tom


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