issue in SD card interface

mszeyghami — Tue, 25 Feb 2020 11:57:09 GMT

Hi friends,

I am using iMX6ull processor and want to extend my flash memory by using SD card peripheral. my emmc is 4G and I want to use 16G sd card as database storage. I've followed the official schematic. when I put the sd card in slot I see below log. what's the problem. I have checked the sd card pins with Oscilloscope, all pins have digital signals.

mmc0: host does not support reading read-only switch, assuming write-enable
mmc0: new high speed SD card at address 0002
mmcblk0: mmc0:0002 965 MiB
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmc0: tried to reset card
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmcblk0: retrying using single block read
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0
blk_update_request: I/O error, dev mmcblk0, sector 0
Buffer I/O error on dev mmcblk0, logical block 0, async page read
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmc0: tried to reset card
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmcblk0: retrying using single block read
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0
blk_update_request: I/O error, dev mmcblk0, sector 0
Buffer I/O error on dev mmcblk0, logical block 0, async page read
mmcblk0: unable to read partition table
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmc0: tried to reset card
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmcblk0: retrying using single block read
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0
blk_update_request: I/O error, dev mmcblk0, sector 0
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmc0: tried to reset card
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00
mmcblk0: retrying using single block read
mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0
blk_update_request: I/O error, dev mmcblk0, sector 0
Buffer I/O error on dev mmcblk0, logical block 0, async page read

the dts file content is like below:

&usdhc1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usdhc1>;
cd-gpios = <&gpio1 19 GPIO_ACTIVE_LOW>;
keep-power-in-suspend;
enable-sdio-wakeup;
bus-width = <4>;
status = "okay";
};

Re: issue in SD card interface

igorpadykov — Tue, 25 Feb 2020 23:26:40 GMT

Hi king

reason may be broken sd/emmc and one can try another device.

dts usdhc1 example can be found on:

imx6ull-14x14-evk.dts\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

Best regards
igor
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Re: issue in SD card interface

mszeyghami — Wed, 26 Feb 2020 07:29:14 GMT

Thank you Igor

I have check with 3 different SD cards and the problem still persists

I use default dts file.

Re: issue in SD card interface

igorpadykov — Thu, 27 Feb 2020 01:47:10 GMT

for narrowing down problem one can try basic sd card tests, checking

signals with oscilloscope:

rt-thread/usdhc_test.c at master · RT-Thread/rt-thread · GitHub

Best regards
igor

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