On Fri, Jun 10, 2005 at 07:08:11PM -0400, Lee Revell wrote: > b44 needs 30 bit: > > #define B44_DMA_MASK 0x3fffffff > > These seem to be all over the place. I guess it saves a tiny bit of > silicon. Don't these all violate the PCI spec? No, it's permitted. What would violate the PCI spec would be failing to decode the full 32/64 bit address and creating aliases (like 10-bit ISA cards did). This is just a reestriction on which parts of memory a card can DMA to. > Should I just add everything from 24 to 63? Actually, it'd be useful to have a central list of what DMA masks devices really take. It might provide some arguments for changing the zone allocater. -- "Next the statesmen will invent cheap lies, putting the blame upon the nation that is attacked, and every man will be glad of those conscience-soothing falsities, and will diligently study them, and refuse to examine any refutations of them; and thus he will by and by convince himself that the war is just, and will thank God for the better sleep he enjoys after this process of grotesque self-deception." -- Mark Twain - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
