Compiler/PROCESSOR-SDK-DRA7X: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Tool/software: TI C/C++ Compiler

Hello，

I need to solve this issue which I have got at the moment on J6. It was successful that  I boot linux kernel from SD card and it can mount root file system .

The issue I am facing is that unabashed to mount the root file system when the boot mode was emmc boot mode. And this work refer to this http://processors.wiki.ti.com/index.php/Processor_SDK_Linux_Automotive_Software_Developers_Guide#Using_eMMC_Boot .

I see this fragment in the log:

[   2.304766] ALSA device list:

[   2.307743]   #0: DRA7xx-EVM

[   2.310645]   #1: HDMI 58040000.encoder

[   2.314491]   #2: DRA7xx-JAMR3

[   2.318230] VFS: PARTUUID= is invalid.

[   2.318230] Expected PARTUUID=<valid-uuid-id>[/PARTNROFF=%d]

[   2.327708] Disabling rootwait; root= is invalid.

[   2.332711] VFS: Cannot open root device "PARTUUID=" or unknown-block(0,0): error -6

[   2.340532] Please append a correct "root=" boot option; here are the available partitions:

[   2.348944] 1f00             256 mtdblock0 (driver?)

[   2.354077] 1f01           1024 mtdblock1 (driver?)

[   2.359188] 1f02             512 mtdblock2 (driver?)

[   2.364382] 1f03             64 mtdblock3 (driver?)

[   2.369465] 1f04             64 mtdblock4 (driver?)

[   2.374566] 1f05           8192 mtdblock5 (driver?)

[   2.379646] 1f06           22656 mtdblock6 (driver?)

[   2.384742] b300         7602176 mmcblk0 driver: mmcblk

[   2.390086]   b301           65536 mmcblk0p1 5181ef41-01

[   2.395444]   b302         7527176 mmcblk0p2 5181ef41-02

[   2.400800] b320           8192 mmcblk0boot1 (driver?)

[   2.406142] b310           8192 mmcblk0boot0 (driver?)

[   2.411492] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

But,if the SD card is plugged in the board ,the board can boot linux kernel from emmc and mount root file system.