[Letux-kernel] DMA driver (was Re: [PATCH 00/20] A bunch of JZ4730 fixups for letux-kernel)
Dr. H. Nikolaus Schaller
hns at goldelico.com
Fri Jan 15 22:23:52 CET 2021
Would you have or know some sample Code?
On The Road
> Am 15.01.2021 um 21:04 schrieb Paul Boddie <paul at boddie.org.uk>:
> On Friday, 15 January 2021 09:49:34 CET H. Nikolaus Schaller wrote:
>>> Am 15.01.2021 um 00:49 schrieb Paul Boddie <paul at boddie.org.uk>:
>> Thanks! I gave it a try but we still have the waiting for mmc issue.
> Yes, it was a long shot, but definitely something that needed fixing.
>> Hm. Maybe we need a different test strategy.
>> Boot with non-dma MMC driver and try to use DMA for something else after
>> successful boot. Maybe a dummy driver which just tries to copy bytes around
>> which can be loaded through modprobe from the command line?
>> Then we can easily inspect register values and activities of the isolated
>> driver and how it interacts with the DMA controller registers.
> Yes, this was effectively what I was doing in my own environment. Just
> scheduling some memory-to-memory transfers via DMA would be informative.
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