Re: 2.1.102, IDE DMA and OPTi 82C621

mlord (
Mon, 18 May 1998 13:59:03 -0400

Trevor Johnson wrote:
> > > I have a PC with an Amptron PM-7400 motherboard. The OPTi 82C621 chip is
> > > built onto it. According to the author of the Linux driver for this chip,
> > > it does not support IDE DMA. I compiled Linux 2.1.102 with
> >
> > I am the author of the Linux IDE DMA driver,
> > which is *the* driver for all IDE PCI DMA chipsets,
> > and I don't remember you asking me that.
> I had asked Jaromir Koutek, the author of the OPTi 621 driver for Linux
> (drivers/block/opti621.c).

The opti621.c file is not actually a driver, but rather a chipset
tuning module. That code may get removed sometime soon,
as it is being superceeded by the new /proc/ide/*/config interface.

Try building a kernel *without* the opti621 support,
and see if DMA works then.


The Linux IDE guy

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