[EMAIL PROTECTED] wrote:
>
> > I have to use Linux kernel version 2.4.1 for my sh architecture.
>
> OK; the patch adding the hcca support was posted pretty
> recently, you presumably found it in the archives. Or just
> use the latest OHCI driver (from 2.4.3).
>
> > But for my architecture there is a problem with pci_alloc_consistent:
>
> Hmm, this would seem to raise the question of whether this
> architecture fits in the linux/Documentation/DMA-mapping.txt
> framework at all. Why does pci_alloc_consistent() exist if it's
> not allocating uncachable memory? Is that a fixable bug?
We are working to solve this bug. We hope to produce our own patch in a
few days.
>
> Seems like every driver on SH would need explicit cache flushes
> all over the place. Is that what other drivers are doing?
Yes, that's a problem for other drivers.
Best regards
Orazio.
>
> - Dave
>
> > void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
> > dma_addr_t * dma_handle)
> > {
> > void *ret;
> > int gfp = GFP_ATOMIC;
> >
> > printk("BUG: pci_alloc_consistent() called - not yet
> > supported\n");
> > /* We ALWAYS need DMA memory on the overdrive hardware,
> > * due to it's extreme wierdness
> > * Need to flush the cache here as well, since the memory
> > * can still be seen through the cache!
> > */
> > gfp |= GFP_DMA;
> > ret = (void *) __get_free_pages(gfp, get_order(size));
> >
> > if (ret != NULL) {
> > memset(ret, 0, size);
> > *dma_handle = virt_to_bus(ret);
> > }
> > return ret;
> > }
>
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