Ok,
I answer to myself, to whomever it may interest: the DMA controller to
use is the PCI_DMA controller, and not the generic DMA controller.
Right now, I'm trying to figure out if there's a generic PCI API I can
extend to talk to the PCI DMA controller.
Matteo Fortini ha scritto:
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
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
