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Re: Alpha Miata IDE disk problem

On Wed, May 05, 2004 at 11:44:08AM -0400, Tyson Whitehead wrote:
> > I have a MIATA PWS 500a with a custom Woody installation updated to SID,

> > BUT I get strange filesystem (ext2) corruptions only with the 2.4.26
> > kernel. Untarring the kernel sources I can see random binary data in the
> > sources. I also tried a 2.6.4 kernel but the filesystem corruption was so
> > bad I had to wipe the disk.

> Yeah.  I had this problem to.  Corrupted my backup harddrive as well.  : )

> I finally got bug free access to my IDE drives by not compiling in CMD646 
> support to kernel (i.e. just generic PCI IDE).

> This stops the kernel from enabling any special features (DMA, etc) on the 
> CMD646 chipset.  The downside is IDE disk access is slow.

> - From reading the documentation/source, I understand the CMD64x chipsets are 
> buggier than I'll get out.  Guess the real solution then is to use the SCSI 
> subsystem or a different IDE controller.

FWIW, I was seeing repeated DMA timeouts with my CMD64x IDE controller
when testing with a 2.4.25 kernel in debian-installer.  Crude surgery to
remove the cmd64x module from view fixed this problem handily. :)

Steve Langasek
postmodern programmer

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