Messages in this thread | | | Date | Thu, 2 May 2002 15:52:53 -0600 (MDT) | From | Kurt Ferreira <> | Subject | Re: Bug: Discontigmem virt_to_page() [Alpha,ARM,Mips64?] |
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> On Thu, May 02, 2002 at 03:20:39PM -0700, Martin J. Bligh wrote: > > IIRC, there are some funny games you can play with 32bit PCI DMA. > > You're not necessarily restricted to the bottom 4Gb of phys addr space, > > you're restricted to a 4Gb window, which you can shift by programming > > a register on the card. Fixing that register to point to a window for the > > node in question allows you to allocate from a node's pg_data_t and > > assure DMAable RAM is returned. > > M. > > > Woops, I forgot about the BAR, thanks. Heck, IIRC you were even the one > who told me about this trick. > By this do you mean setting bits BAR[2:1]=b'10? Just making sure I get it.
Thanks Kurt
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