random mmc error

javiermarto — Thu, 12 Mar 2015 17:17:27 GMT

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)

Re: random mmc error

igorpadykov — Fri, 13 Mar 2015 01:01:31 GMT

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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Re: random mmc error

markusniebel — Fri, 13 Mar 2015 08:08:56 GMT

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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