DMA changes in 2.3.41 - how the f* do I get this working on ARM?

[Andre Hedrick]

Russell,

I missed covering your a**..........yes this is a WTF.
Where did you find the break point........It will get fixed.

On Sun, 30 Jan 2000, Russell King wrote:

> Hi,
> 
> I've been looking over the 2.3.41 patch, and have come across a major problem
> area for ARM.
> 
> On ARM, there is no such thing as "dma coherent" memory.  Unfortunately, the
> new PCI code (pci_alloc_consistent) appears to assume that there is a way
> of doing this.
> 
> I have had ideas about ways to do this on the ARM, but it will not be trivial
> changes to the mm layer, and certainly has not been implemented yet.
> 
> This effectively means that I seem to have two options:
> 
> 1. either we loose any hope of IDE DMA for the rest of 2.3 and 2.4, or
> 2. the IDE DMA code gets the dma_cache_* macros added back in
> 
> I would have preferred to have heard about the extent of these changes (and
> that the dma_cache_* macros were going to be removed, along with my comments
> marking them with my initials) before it was submitted.
> 
> For now, I'm adding the dma_cache_* macros back in, and if I don't hear anything,
> I will be re-submitting that code back to Linus.
> 
> (very pissed)
>    _____
>   |_____| ------------------------------------------------- ---+---+-
>   |   |         Russell King        rmk en arm.linux.org.uk      --- ---
>   | | | |   http://www.arm.linux.org.uk/~rmk/aboutme.html    /  /  |
>   | +-+-+                                                     --- -+-
>   /   |               THE developer of ARM Linux              |+| /|\
>  /  | | |                                                     ---  |
>     +-+-+ -------------------------------------------------  /\\\  |
> 
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Andre Hedrick
The Linux ATA/IDE guy

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