How alloc non-cache type memory?
yuka.muromachi at gmail.com
Thu Aug 4 07:37:03 GMT 2005
I meet some problem with nvidia chip, the dma buffer data seems incorrect.
Windows NT can use MmAllocatePagesForMdl() to allocate nonpaged
physical memory and use MmMapLockedPagesSpecifyCache() map to kernel
MmMapLockedPagesSpecifyCache() also can set page cachetype to MmNonCached.
Then use MmGetPhysicalAddress() to get physical address fill to DMA
If I set cache type to MmNonCached, it will work.
Is there any way to allocate Non-Cached type physical memory for dma
transfer in FreeBSD?
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