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How to change eMMC(usdhc) frequency from uboot ?

Question asked by Rakesh Patel on Feb 26, 2020
Latest reply on Mar 2, 2020 by Rakesh Patel

Hi,

 

 

How to changes frequency for usdhc frequency in imx6sx board with kernel version: 4.1.15. 

We have custom board based on imx6sx and we are using eMMC with it.

 

We have changed value in following but changes are not reflected.

File: board/freescale/mx6sxsabresd/mx6sxsabresd.c

API: board_mmc_init

Code :

usdhc_cfg[2].sdhc_clk = 190000000;
printf("DEBUG: Passing new EMMC value 190000000\n");

 

Output from Linux:

cat /sys/kernel/debug/mmc3/clock
198000000

 

 

Is it possible to change eMMC frequency for kernel(or dts file) ?

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