Mask for DMA to chip ram
13-Oct-94 01:08:05
Sb: #167505-Mask for DMA to chip ram
Fm: Ronald B. Romine 70322,1525
To: John M. Collier 72172,1363
JC >>what mask to use to restrict DMA to chip ram only?<<
I was under the impression that a MASK of 0xfffffe, would restrict DMA to
the first 2-megs of address space. You might try 0xffffe.
Also, you have to set the MASK for EACH partition.
If you have multiple partitions, but only limit the DMA MASK on the first
partition, the other partitions could still try to access a larger DMA
area, and be causingthe lockups.
Ron. – ("I'm not stupid, I'm not expendable, and I'm not going!"
– quote made by any low level RPG player.)