Messages in this thread |  | | | Date | Tue, 1 Jan 2002 18:40:04 +0100 | | From | Jens Axboe <> | | Subject | Re: [linux-usb-devel] Re: "sr: unaligned transfer" in 2.5.2-pre1 |
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On Mon, Dec 31 2001, Matthew Dharm wrote: > Jens -- > > Thanks for the info. It may have been discussed 'here' (tho, this is > crosposted to two different lists), but I've been focused on 2.4 bugs (one > more left!) and hadn't seen this item.
oh sorry, 'here' means linux-kernel to me :-)
> I think for the first 2.5 kernels, we'll o with your 'vaddr' line, but I > think that being able to set highmem_io is a worthwhile thing. Which leads > me to two questions:
indeed
> (1) Do the USB HCDs support highmem? I seem to recall they do, but I'm not > certain.
most likely, I don't know though. I would imagine they support full 32-bit dma.
> (2) How do I pass a highmem address to the HCDs? The URB structures we use > don't seem particularly well-suited for this.
you need to use the pci dma mapping interface, see Documentation/DMA-mapping.txt
-- Jens Axboe
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