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About SD card mode operation in i.MX6DQ.

Question asked by Keita Nagashima on Jul 8, 2015
Latest reply on Jul 9, 2015 by Keita Nagashima

Dear All,

 

Hello.

My customer is using android jb4.2.2_1.1.0 (L3.0.35) of i.MX6DQ.

When the "mmc_sd_init_card" function in kernel_imx/src/drivers/mmc/core/sd.c doesn't call "mmc_sd_switch_hs function", which mode does the SD card work?

- SD/SDIO full speed mode (up to 25 MHz)

- SD/SDIO high speed mode (up to 50 MHz)

- SD/SDIO UHS-I mode (up to 208Mhz in SDR mode, up to 50Mhz in DDR mode)

 

And, when mmc_sd_switch(card,1,0,1,status) function is not called, is there an bad effect?

 

Best Regards,

Keita

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