Waiting for root device /dev/mmcblk0p1...

[yektaayduk]

Hi

My custom board (mx53) is booting from SD card (u-boot), loading kernel image from sdcard ,then starting kernel 

then it should read rootfs from sdcard ,but freezes after printing:

Waiting for root device /dev/mmcblk0p1...

-Are CardDetect and WriteProtect HW pins necessary ,I dont have WP signal ?

-My  kernel config  lines (  # MMC/SD/SDIO Card Drivers and # MMC/SD/SDIO Host Controller Drivers )

are  like in  imx5_defconfig file  so I dont have wrong configuration?

-May I use rootfs.jffs2   from L2.6.35_11.09.01_ER_images_MX5X folder ?

Currently I  dont have  hw dependent  custom modules .

Original Attachment has been moved to: minicom3.txt.zip

[王显松]

Hello~I have the same question with you .Have you find the answer about this one?

   If yes,Could you please share your achievement with me!

Best regards!

[williamxu]

hi Wang,

I have the same problem when I porting a customer board.

I want to discuss detail with you,may I?

william

[王显松]

Of course.But I haven't solve the problem!

I have tried every mmcblk ,but it's no use!Somebody told me that it is becouse of WRITING PROTECT! But I don't konw how to deal with it !

[yektaayduk]

Maybe its data clk relation ?

Check SD card  DATA ,CLK relationship with osciloscope .

As far as I remember, in full speed mode clk edge was not  in the center  of data ,but in half speed mode it was .

[王显松]

in which file can I modify the data clk? Only need to modify this one ？

[yektaayduk]

According to my observation data-clk relation changes with one of the switch settings ,related to SDcard speed.

İn imx quickstart board schematics  SW1.6=sSD/mmc speed  SW1.6=0 => high SW1.6=1 =>normal

But if you can get u-boot prompt ,I think you don't have SDcard access problem .

[yektaayduk]

Update : set card_inserted_state , lower max_clk as below:

static struct mxc_mmc_platform_data mmc1_data = {

.max_clk = 20000000,

    .card_inserted_state = 1,

    .status = sdhc_get_card_det_status,

}

minicom output changed as:

mmc0: new high speed SDHC card at address 1234

mmcblk0: mmc0:1234 SA04G 3.63 GiB

mmcblk0: p1

Waiting for root device /dev/mmcblock0p1...  

??

[LeonardoSandova]

Could you post the kernel log and the u-boot environment variables?

[yektaayduk]

I suppose kernel log is  ltib/rootfs/boot/linux.config ,

uboot env vars are in ~/ltib/rpm/BUILD/u-boot-2009.08/include/configs/myboard.h .

Im attaching also minicom.txt  minicom output .

Thanks for your interest .

[LeonardoSandova]

On u-boot console, try to set the kernel cmd line parameter 'root' as the following 'root=/dev/mmcblk0p1', then save the change ('saveenv'). I believe that should solve the issue.

[yektaayduk]

It started to work after I write my own roorfs folder into sdcard, before I was using the rootfs.ext2 in BSP .

Also the kernel commandline is changed to

Kernel command line: console=ttymxc0,115200 ip=192.168.10.1 root=/dev/mmcblk0p1 rootwait

previous kernel commandline was

Kernel command line: console=ttymxc0,115200 ip=192.168.10.1 root=/dev/mmcblock0p1 rootwait

I have copied the rootfs  to sdcard as below:

sudo mkfs.ext3 /dev/sdb1

sudo mount /dev/sdb1 /mnt/sdcard

sudo cp -r  /home/yekta/ltib/rootfs/* /mnt/sdcard

sudo umount /mnt/sdcard

uboot env settings:

MX53-DENETIM U-Boot > printenv

bootdelay=3

baudrate=115200

loadaddr=0x70800000

netdev=eth0

ethprime=smc911x

uboot=u-boot.bin

kernel=uImage

nfsroot=/opt/eldk/arm

bootargs_base=setenv bootargs console=ttymxc0,115200

bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nroot},v3,tcp

bootcmd_net=run bootargs_base bootargs_nfs; tftpboot ${loadaddr} ${kernel}; bootm

bootcmd_mmc=run bootargs_base bootargs_mmc; mmc dev 0;mmc read ${loadaddr} 0x800 0x180 bootm

bootcmd=run bootcmd_mmc

bootargs_mmc=setenv bootargs ${bootargs} ip=192.168.10.2 root=/dev/mmcblk0p1 rootwait bootargs=root=/dev/mmcblk0p1

stdin=serial

stdout=serial

stderr=serial

Environment size: 644/8188 bytes

MX53-DENETIM U-Boot >