Messages in this thread | | | Date | Sat, 13 Mar 1999 11:18:42 -0800 | From | Guy Sotomayor <> | Subject | Re: > 1GB on alpha. Patch to 1TB? |
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Quoted mail: > 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.
---End quote This is also a problem when you have multiple PCI busses. There is no really good near term solution but 32bit PCI on large memory systems + multiple PCI busses should probably be delt with together since they will likely hit the same parts of the code.
TTFN - Guy
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