On 08/19/2013 11:48 AM, Michael Schmitz wrote:
Geert,
On Sun, Aug 18, 2013 at 10:58 AM, Michael Schmitz
<schmitzmic@xxxxxxxxx> wrote:
I'll also need to check the command_block and command_block_dma
addresses -
does the DMA require virtual or physical addresses?
Physical, of course.
:-) VDMA was invented a bit later ...
I'll go check the usage of the DMA API calls again, but as the driver
seems to do DMA fine until the short transfer, that seems the most
likely cause. PIO for dma_count < 7 might be an option.
I see transfers with esp_count=1 and dma_count=7 in the log - wonder
why that works but the short 2/2 byte case does not.
Is it possible that the problem is with memory alignment?
http://fxr.watson.org/fxr/source/arch/amiga/dev/bzivsc.c?v=NETBSD#L360
https://groups.google.com/d/msg/comp.sys.amiga.hardware/FXwaSFoAPxc/zsXeP7PB6RoJ
-Tuomas
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