Messages in this thread | | | Date | Sat, 13 Mar 1999 10:50:23 -0800 (PST) | From | Matthew Jacob <> | Subject | Re: > 1GB on alpha. Patch to 1TB? |
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There are a growing number of 64 bit PCI implementations. Alpha has quite a chunk of this, and so does UltraSparc.
Is there a framework in place or a notion of how the Linux PCI stuff ought to cope with this yet?
On Sat, 13 Mar 1999, Richard Henderson wrote:
> On Wed, Mar 10, 1999 at 11:57:38PM -0600, Bob McElrath wrote: > > It seems simple to me to modify these two files to support up to 1TB memory > > on the alpha, as opposed to the hard-coded limit of 1GB now. It appears the > > 21172 will only decode 40 bits of address, not 64, but that's 1TB... > > With 32-bit PCI devices, it is difficult to get past 2GB RAM. More > than that requires either bounce buffers or that PCI windows be > adjusted at runtime to cope with the various outstanding DMA requests. > Which would be cool, but i think fairly tricky to modify all the > drivers to get right. > > However, there's no reason we can't support 2GB instead of 1. > > > r~ >
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