Hi all,
I'm trying to send some data through DMA from a memory buffer to a PCI
video card VRAM.
While I got that I need to alloc the src buffer through
dma_alloc_coherent, I don't understand which address I should give as
the dst address.
I tried both the mapped hw address and an address received from
pci_map_single, but even if the DMA transfer completes "correctly", I
have the wrong data in the VRAM in the end.
I read about all the PCI DMA manuals, but it seems they are for letting
some external DMA device on the PCI bus read/write from/to the main memory.
How do you do that?
Thanks,
Matteo
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