topic Re: EMMC 5.0 support in i.MX Processors

EMMC 5.0 support

cilymo — Thu, 20 Jul 2017 09:38:50 GMT

Hi,

Can imx6 BSP-4.1.15-2.0.1 support EMMC 5.0 ? not use as EMMC 4.4.

Re: EMMC 5.0 support

art — Thu, 20 Jul 2017 10:11:55 GMT

The i.MX6 series processors do not support the eMMC 5.0 specification in hardware. Only the backward-compatible eMMC 4.4 use is possible.

Have a great day,
Artur

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Re: EMMC 5.0 support

cilymo — Fri, 21 Jul 2017 00:56:18 GMT

Hi Artur,

So, how to modify this(use eMMC 5.0 as eMMC 4.4) int BSP version 4.1.15-2.0.1?

The "mmc_read_ext_csd" function is not the same as "https://community.nxp.com/docs/DOC-332187" said.

Thanks,

Cily

Re: EMMC 5.0 support

joanxie — Fri, 21 Jul 2017 09:17:23 GMT

try to change check value of card->ext_csd.rev, change 6 to 7.

now eMMC 5.0 can work as an eMMC 4.4.

Re: EMMC 5.0 support

cilymo — Mon, 24 Jul 2017 10:21:24 GMT

Hi Artur,

I only find this below, please see "is change this 6 to 7 ?";

/*
* Enable power_off_notification byte in the ext_csd register
*/
if (card->ext_csd.rev >= 6) {    //is change this 6 to 7 ?
  err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
     EXT_CSD_POWER_OFF_NOTIFICATION,
     EXT_CSD_POWER_ON,
     card->ext_csd.generic_cmd6_time);
  if (err && err != -EBADMSG)
   goto free_card;

  /*
   * The err can be -EBADMSG or 0,
   * so check for success and update the flag
   */
  if (!err)
   card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
}

Is it correct ?

Thanks,

Cily