Re: port-alpha/40604 (AlphaServer DS20E loses HDs and other Drives when adding 1 GB more RAM)

[tnn%NetBSD.org@localhost]

Synopsis: AlphaServer DS20E loses HDs and other Drives when adding 1 GB more RAM

State-Changed-From-To: open->analyzed
State-Changed-By: tnn%NetBSD.org@localhost
State-Changed-When: Sun, 18 Jul 2021 14:18:22 +0000
State-Changed-Why:
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.