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Re: port-alpha/40604 (AlphaServer DS20E loses HDs and other Drives when adding 1 GB more RAM)
Synopsis: AlphaServer DS20E loses HDs and other Drives when adding 1 GB more RAM
State-Changed-When: Sun, 18 Jul 2021 14:18:22 +0000
The problem is that the direct-mapped DMA window configured by SRM
is limited in size to 1 GiB. It is partially fixed in -current by
opening another DMA window between 1 GiB to 2 GiB.
There are still some issues in the common bus DMA code for alpha that
prevent this DMA window from being correctly used.
Me and thorpej@ are working on a fix for the above.
SGDMA fallback for PCI seems broken on tsunami for some different reason.
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