about cma

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about cma

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changbaoma
Contributor III

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?

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b36401
NXP Employee
NXP Employee

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.

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b36401
NXP Employee
NXP Employee

[deleted]

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changbaoma
Contributor III

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?

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749 Views
b36401
NXP Employee
NXP Employee

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.