topic Re: Accessing eMMC in i.MX6 - Linux in i.MX Processors

Accessing eMMC in i.MX6 - Linux

JHY — Tue, 09 Jun 2015 05:52:52 GMT

Hi, i am using SABRE-SDP, Linux 3.10.53 and SD card boot.

Uboot, Kernel and file systems are all in SD Card.

After boot process, it is shown in console when typing '# cat /proc/partitions'.

31 0 32 mtdblock0

179 0 3872256 mmcblk2 <-- 4G byte SD Card

179 1 8192 mmcblk2p1

179 2 991232 mmcblk2p2

179 8 31344 mmcblk3

My question is that where is eMMC. I can not find eMMC, it is on my board but not displayed.

How can I mount eMMC to my linux system?

Re: Accessing eMMC in i.MX6 - Linux

jimmychan — Tue, 09 Jun 2015 06:46:53 GMT

please check the mmcblk* in /dev/

Re: Accessing eMMC in i.MX6 - Linux

JHY — Tue, 09 Jun 2015 08:12:19 GMT

root@imx6qsabresd:~# ls /dev/mmcblk*

/dev/mmcblk2 /dev/mmcblk2p1 /dev/mmcblk2p2 /dev/mmcblk3

root@imx6qsabresd:~#

There are only mmcblk2 and mmcblk3.

Re: Accessing eMMC in i.MX6 - Linux

jimmychan — Tue, 09 Jun 2015 08:17:59 GMT

mmcblk3 is eMMC

Re: Accessing eMMC in i.MX6 - Linux

jimmychan — Tue, 09 Jun 2015 08:19:47 GMT

For more details, please read i.MX_Linux_User's_Guide.pdf. You can download it in i.MX 6 Series Software and Development Tool R|Freescale

Re: Accessing eMMC in i.MX6 - Linux

JHY — Tue, 09 Jun 2015 09:15:32 GMT

root@imx6qsabresd:~# fdisk /dev/mmcblk3 -l

Disk /dev/mmcblk3: 30.6 MiB, 32096256 bytes, 62688 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

root@imx6qsabresd:~#

mmcblk3 is 32096256 bytes. SABRE has 8GB eMMC, so i think it is not eMMC.

Re: Accessing eMMC in i.MX6 - Linux

jimmychan — Tue, 09 Jun 2015 10:40:39 GMT

please try the following command in u-boot:

> mmc dev 2

> mmcinfo

and show me the result.

Re: Accessing eMMC in i.MX6 - Linux

JHY — Wed, 10 Jun 2015 04:27:17 GMT

=> mmc list

FSL_SDHC: 0

FSL_SDHC: 1

FSL_SDHC: 2

=> mmc dev 2

Timeout waiting for DAT0 to go high!

It seems like no activated device.

Does my board have some troubles?

Re: Accessing eMMC in i.MX6 - Linux

jimmychan — Wed, 10 Jun 2015 05:40:13 GMT

yes, seems the eMMC is not working properly.