This is probably a very stupid question but I can't immediately find the answer. Our application uses the same mechanism as the RPi cam bounty (DMA from PL, memory reserved in DT, and transferred to the application using mmap). Right now I have a cache coherence problem. In the post dated June 30th in this thread tnt said: 1) Map the memory you use for DMA as uncached in the userspace process : This is what's done currently.
My question is: How is it done? Where did you make a modification in order to use that memory as uncached?
I put the question in this threat, bacause it refers to a discussion earlier in here. Maybe it should be put somewhere else.
Thanks.Statistics: Posted by wiegmink — Mon May 15, 2017 11:23 am
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