Re: Problem with ide=nodma

[Bartlomiej Zolnierkiewicz]

On Sat, 9 Oct 2004 00:32:01 +0100 (BST), Ken Moffat
<ken@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Hi,
> 
>  I'm trying a sii 0680 disk controller at the moment, as a possible
> workaround for some via southbridge problems (this is on a ppc which
> isn't yet supported by the official kernels, but it has been stable here
> since 2.6.7 and looks nearly ready for a first review).  Unfortunately,
> DMA is a big no go at the moment so I have to pass ide=nodma in the
> bootargs.
> 
>  I've got the drives plugged into the sii card, and ide=reverse is doing
> its job.  But although dmesg shows that dma has been turned off,

Is it possible that you are reading it wrong?

> /proc/ide/hda/settings and hdparm show that dma is in use.  This is in
> 2.6.9-rc3.
> 
>  Doesn't ide=nodma work for off-board chipsets ?

siimage host driver doesn't respect "ide=nodma".
You can hack siimage.c and comment out "hwif->autodma = 1".
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