random mmc error

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random mmc error

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javiermarto
Contributor II

Every once in a while we are starting our custom board and we are getting this panic (mmcblk0: error -84 transferring data...) reading the EMMC memory, any idea of what could be?

[    2.091481] Waiting for root device /dev/mmcblk0p2...

[    2.124622] mmc1: new DDR MMC card at address 0001

[    2.130853] mmcblk0: mmc1:0001 SEM08G 7.39 GiB

[    2.135739] mmcblk0boot0: mmc1:0001 SEM08G partition 1 1.00 MiB

[    2.141926] mmcblk0boot1: mmc1:0001 SEM08G partition 2 1.00 MiB

[    2.148078] mmcblk0rpmb: mmc1:0001 SEM08G partition 3 128 KiB

[    2.160665] mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00

[    2.170093] mmcblk0: retrying using single block read

[    2.175813] mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0

[    2.185118] blk_update_request: I/O error, dev mmcblk0, sector 0

[    2.192554] mmcblk0: error -84 transferring data, sector 1, nr 7, cmd response 0x900, card status 0x0

[    2.201820] blk_update_request: I/O error, dev mmcblk0, sector 1

[    2.208486] mmcblk0: error -84 transferring data, sector 2, nr 6, cmd response 0x900, card status 0x0

[    2.217744] blk_update_request: I/O error, dev mmcblk0, sector 2

[    2.224426] mmcblk0: error -84 transferring data, sector 3, nr 5, cmd response 0x900, card status 0x0

[    2.233683] blk_update_request: I/O error, dev mmcblk0, sector 3

[    2.240334] mmcblk0: error -84 transferring data, sector 4, nr 4, cmd response 0x900, card status 0x0

[    2.249594] blk_update_request: I/O error, dev mmcblk0, sector 4

[    2.256276] mmcblk0: error -84 transferring data, sector 5, nr 3, cmd response 0x900, card status 0x0

[    2.265533] blk_update_request: I/O error, dev mmcblk0, sector 5

[    2.272198] mmcblk0: error -84 transferring data, sector 6, nr 2, cmd response 0x900, card status 0x0

[    2.281431] blk_update_request: I/O error, dev mmcblk0, sector 6

[    2.288133] mmcblk0: error -84 transferring data, sector 7, nr 1, cmd response 0x900, card status 0x0

[    2.297398] blk_update_request: I/O error, dev mmcblk0, sector 7

[    2.303607] Buffer I/O error on dev mmcblk0, logical block 0, async page read

[    2.311805] mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00

[    2.321205] mmcblk0: retrying using single block read

[    2.326917] mmcblk0: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0

[    2.336166] blk_update_request: I/O error, dev mmcblk0, sector 0

[    2.342823] mmcblk0: error -84 transferring data, sector 1, nr 7, cmd response 0x900, card status 0x0

[    2.352071] blk_update_request: I/O error, dev mmcblk0, sector 1

[    2.358705] mmcblk0: error -84 transferring data, sector 2, nr 6, cmd response 0x900, card status 0x0

[    2.368582] mmcblk0: error -84 transferring data, sector 3, nr 5, cmd response 0x900, card status 0x0

[    2.378457] mmcblk0: error -84 transferring data, sector 4, nr 4, cmd response 0x900, card status 0x0

[    2.388336] mmcblk0: error -84 transferring data, sector 5, nr 3, cmd response 0x900, card status 0x0

[    2.398203] mmcblk0: error -84 transferring data, sector 6, nr 2, cmd response 0x900, card status 0x0

[    2.408137] mmcblk0: error -84 transferring data, sector 7, nr 1, cmd response 0x900, card status 0x0

[    2.417390] Buffer I/O error on dev mmcblk0, logical block 0, async page read

[    2.424706]  mmcblk0: unable to read partition table

[    2.542241] VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2): error -6

[    2.550165] Please append a correct "root=" boot option; here are the available partitions:

[    2.558638] b300         7757824 mmcblk0  driver: mmcblk

[    2.564084] b318             128 mmcblk0rpmb  (driver?)

[    2.569370] b310            1024 mmcblk0boot1  (driver?)

[    2.574795] b308            1024 mmcblk0boot0  (driver?)

[    2.580274] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)

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markusniebel
Contributor I

Hello Javier,

depending on the eMMC used and the kernel version this can also be a problem in the MMC driver stack. I remember we saw also these kind of errors in some situations on our i.MX base modules.

Background: there is a lot of fixing in handling timout and recover from failed commands in the mainline kernels. If you currently use an SDK kernel, could you try current mainline?

Regards

Markus

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Javier

in general such errors may be caused by signal

integrity (poor signal shape), it may be recommended to

tweak driver strength of i.MX6 pads with IOMUXC_SW_PAD_CTL_PAD

SPEED,DSE,SRE settings and recheck board layout

sect.3.5.8 High speed signal routing recommendations IMX6DQ6SDLHDG

for SD module interfaces. One can try to work with decreased operating frequency.

Best regards

igor

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