Messages in this thread | | | Subject | Re: Alpha: virt_to_bus/GFP_DMA problem | From | Jes Sorensen <> | Date | 10 Dec 1999 17:39:06 +0100 |
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>>>>> "Andrea" == Andrea Arcangeli <andrea@suse.de> writes:
Andrea> On Fri, 10 Dec 1999, Thomas Sailer wrote: >> Doesn't the definition of GFP_DMA imply that its bus address should >> lie below 16M?
Andrea> No. On different alpha architectures you have different Andrea> limits. Have a look at include/asm-alpha/dma.h. The GFP_DMA Andrea> returns memory that must work for doing ISA_DMA.
Yes it does, ISA DMA by definition is limited to 24 bit on the bus side afaik, it's a bit hard to feed a 64 bit address to a device which only has space for 24 bit in it's registers.
Jes
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