Re: DMA API issues

[Ian Molton]

On 18 Jun 2004 13:20:43 -0500
James Bottomley <James.Bottomley@xxxxxxxxxxxx> wrote:

> 
> Erm, well this isn't unusual.  A lot of devices have on board memory
> to offload accesses to.  All the later Symbios SCSI chips for
> instance.  If you look at the drivers, you'll see they ioremap the
> region and then use it via the normal memory accessors.

Thats all well and good for devices which have their own drivers, but
thats not the case always.

the device I described is an OHCI controller, and in theory, it should
be able to use the OHCI driver in the kernel without any modification,
*as long as* the DMA API returns valid device and virtual addresses,
which, at present, it does not.

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