Messages in this thread | | | From | (H. Peter Anvin) | Subject | Re: x86 36-bit support easier with Xeon? | Date | 6 Jul 1998 22:48:34 GMT |
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Followup to: <199807062200.AAA00813@stefan.sime.com> By author: Stefan Traby <stefan@sime.com> In newsgroup: linux.dev.kernel > > Hi ! > > > 'How do we DMA into >4G physical RAM?' > > > > 2) PCI cards which support 64 bit addresses might work (ie. none of most > > current PCI cards, and i guess chipsets arent too overtested either, > > regarding this feature). > > Hmm, the current "64 bit" PCI-Slots (ex. on Alphas) allow 64 Bit data but > only 32 bit addresses. This is no real problem for current boards > (UX && BX: 6x512M == 3GB max mem); but I'm not shure if the PCI specs > covers 64 bit addresses at all; I don't think so. >
They do, but it's an extension, and most cards don't support them it seems.
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