i.MX6 SD Card broken after continous test

[jaganteki]

Hi,

I have i.MX6qdl board where usdhc3 is designed for SD card slot. I'm using Linux from linux-2.6-imx.git - Freescale i.MX Linux Tree  with imx_4.1.15_1.0.0_ga tag.

On the Linux, I have a continuous /dev/urandom test followed by pattern(attached sd_test.sh). Test seems working with single iteration after that it triggers mmc errors. So when I take the card from target and plug-in to host the card seems not mountable, but able to see the partitions.

Here are the pads, I have used:

                        MX6QDL_PAD_SD3_CMD__SD3_CMD    0x17061
                        MX6QDL_PAD_SD3_CLK__SD3_CLK    0x10059
                        MX6QDL_PAD_SD3_DAT0__SD3_DATA0 0x17061
                        MX6QDL_PAD_SD3_DAT1__SD3_DATA1 0x17061
                        MX6QDL_PAD_SD3_DAT2__SD3_DATA2 0x17061
                        MX6QDL_PAD_SD3_DAT3__SD3_DATA3 0x17061

Here are the Linux frequency details.

# cat /sys/kernel/debug/mmc0/ios
clock:          50000000 Hz
actual clock:   49500000 Hz
# cat /sys/kernel/debug/mmc0/clock
50000000

Attached kernel_sd.log for boot log and mmc issues.

Any inputs please let us know.

[jaganteki]

Thanks for the response Igor.

So, are you fine with the pad configurations and drive frequency? Do you think it is stability issue with respect to the existing i.MX kernel?

[igorpadykov]

Hi Jagan

pad configurations and drive frequency can be judged based on emmc waveforms

on oscilloscope, they should be good shape and conform timings given in

sect.4.12.4 Ultra High Speed SD/SDIO/MMC Host Interface (uSDHC) AC Timing

i.MX6Q Datasheet

http://www.nxp.com/docs/en/data-sheet/IMX6DQCEC.pdf 

Best regards
igor

[igorpadykov]

Hi Jagan

one can try with new kernels from source.codeaurora.org/external/imx/linux-imx repository

linux-imx - i.MX Linux kernel 

also one can test with brand new card since issue may be caused by mmc wearing.

Best regards
igor
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