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Diffstat (limited to 'NOTES')
| -rw-r--r-- | NOTES | 9 |
1 files changed, 9 insertions, 0 deletions
@@ -1,3 +1,12 @@ +Memory Addressing +================= + There is 3 types of addresses: virtual, physical, and bus. For DMA a bus + address is used. However, on x86 physical and bus addresses are the same (on + other architectures it is not guaranteed). Anyway, this assumption is still + used by xdma driver, it uses phiscal address for DMA access. I have ported + in the same way. Now, we need to provide additionaly bus-addresses in kmem + abstraction and use it in NWL DMA implementation. + DMA Access Synchronization ========================== - At driver level, few types of buffers are supported: |