i.MX ProcessorsのトピックRe: about cma

about cma

changbaoma — Thu, 19 Aug 2021 14:03:48 GMT

camera and display interface do not exist in my imx6ull board，but ip camera may be used.

1. can i disable the reserved-memory(cma) node in imx6ull dts？ if yes, is there any bad effect?

2. which driver may use that CMA area?

Re: about cma

b36401 — Wed, 25 Aug 2021 05:52:20 GMT

[deleted]

Re: about cma

changbaoma — Fri, 20 Aug 2021 10:49:23 GMT

when CMA aera enable, will all DMA transfers of imx6 Peripherals use the CMA aera？

is there any bad effect if disable CMA node in dts?

Re: about cma

b36401 — Wed, 25 Aug 2021 05:51:08 GMT

I considered with collegues and it is not good idea to disable CMA.
Many peripherals on i.MX6ULL used DMA and needs CMA.
Of course you can change their drivers for not using DMA but then you loose the performance.