i.MX Processors中的主题 i.MX7D M4 and eMMC

i.MX7D M4 and eMMC

indirokanovic — Thu, 22 Feb 2018 12:39:28 GMT

Can M4 have access to eMMC while A7 cores are in sleep?

Re: i.MX7D M4 and eMMC

Carlos_Musich — Thu, 22 Feb 2018 21:48:07 GMT

Hi Indir,

it should be possible, but in this case you must have a driver for M4 to access eMMC and NXP does not provide such driver. With a driver you should be able to access directly to the memory to read/write raw data or you may use a file system.

Regards,
Carlos
NXP Technical Support
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Re: i.MX7D M4 and eMMC

mtx512 — Fri, 23 Feb 2018 08:28:52 GMT

We did something similar using the M4 on the imx6sx but connected to a SD card reader (see SD Card interfacing from M4 via SPI). Points to note:

1. You may not be able to use DMA as this is controlled from the Linux side.

2. If A7 is in sleep mode then certain clocks may not be available or running at reduce speed which will effect data transfer rate.