i.MX ProcessorsのトピックRe: mmc0: error -84 whilst initialising MMC card

mmc0: error -84 whilst initialising MMC card

xrztech_wen — Wed, 05 Aug 2015 12:41:48 GMT

hi,everyone,

I met a problem about the EMMC:

When the unit bootup from the EMMC,it would report this error:

mmc0: error -84 whilst initialising MMC card

Follow the source code,I found when the emmc tried to send this command:

#define MMC_ALL_SEND_CID 2 /* bcr R2 */

it would met error.

when we tried to init the EMMC,we need tried to Fetch CID from card,but it couldnot fetch it:

* Fetch CID from card.

if (mmc_host_is_spi(host))

err = mmc_send_cid(host, cid);

else{

err = mmc_all_send_cid(host, cid); ---> process this funtion,it would report error -84

printk("%s,[%d],err =%d \n",__func__,__LINE__,err);

}

if (err)

goto err;

Do you know why ? and how to solve this problem? Thanks very much in advance.

BTW,

1.My BSP version is :android 4.0.4 (android-13.5.0-ga.01);

2.The kernel version is:Linux 3.0.35;

3.the CPU is:CPU identified as i.MX6SoloLite, silicon rev 1.2

3.Here is the mmcinfo:

MX6Sl Z970B U-Boot > mmc dev 1

mmc1(part 0) is current device

MX6Sl Z970B U-Boot > mmcinfo

Device: FSL_USDHC

Manufacturer ID: 11

OEM: 100

Name: 008GE

Tran Speed: 25000000

Rd Block Len: 512

MMC version 4.0

Clock: 52000000

High Capacity: Yes

Capacity: 7818182656 Bytes

Bus Width: 4-bit DDR

Current Partition for boot: Not bootable

MX6Sl Z970B U-Boot >

4.For more informations,please refer to the attachment file.

Original Attachment has been moved to: emmc_84_error.txt.zip

Re: mmc0: error -84 whilst initialising MMC card

jimmychan — Fri, 07 Aug 2015 02:59:08 GMT

your EMMC is 4bit width?

Re: mmc0: error -84 whilst initialising MMC card

xrztech_wen — Fri, 07 Aug 2015 05:01:57 GMT

No,it was 8 Bit width.

Re: mmc0: error -84 whilst initialising MMC card

jimmychan — Fri, 07 Aug 2015 06:34:04 GMT

are you config the emmc like this?

.always_present = 1,

.keep_power_at_suspend = 1,

.support_8bit = 1,

.delay_line = 0,

.cd_type = ESDHC_CD_PERMANENT,

Re: mmc0: error -84 whilst initialising MMC card

xrztech_wen — Fri, 07 Aug 2015 09:09:03 GMT

Sorry for reply later.

Here is my sd's config:

static const struct esdhc_platform_data mx6_evk_sd2_data __initconst = {

.cd_gpio = MX6SL_INVALID_GPIO,

.wp_gpio = MX6SL_INVALID_GPIO,

.support_8bit = 1,

.support_18v = 0,

.keep_power_at_suspend = 1,

.delay_line = 0,

.always_present = 1,

.cd_type = ESDHC_CD_PERMANENT,

.platform_pad_change = mx6sl_evk_plt_sd_pad_change,

};

Re: mmc0: error -84 whilst initialising MMC card

chayishuang — Tue, 20 Dec 2016 12:10:06 GMT

How do you solve that problem? Thanks very much in advance.

Re: mmc0: error -84 whilst initialising MMC card

marcocavallini — Tue, 06 Jun 2017 14:57:40 GMT

Error -84 is happens when we try to fetch CID from EMMC
For that reason you should replace the boot parameters to

    root=/dev/mmcblk2p2

instead of

    root=PARTUUID=${uuid}