STM32MP151c内核找不到rootfs怎么解决？

我有一个基于 STM32MP151c 的定制板，上面有一个 eMMC（没有 SD 卡）。在U-Boot中成功找到eMMC，分区如下：

• part list mmc 0
• Partition Map for MMC device 0  --   Partition Type: EFI
• Part    Start LBA       End LBA         Name
•         Attributes
•         Type GUID
•         Partition GUID
•   1     0x00000400      0x000013ff      "ssbl"
•         attrs:  0x0000000000000000
•         type:   8da63339-0007-60c0-c436-083ac8230908
•         guid:   81ae02b5-e823-4dfa-909e-f18021275bd7
•   2     0x00001400      0x000213ff      "boot"
•         attrs:  0x0000000000000004
•         type:   0fc63daf-8483-4772-8e79-3d69d8477de4
•         type:   linux
•         guid:   8691f7b3-c55d-4979-ad45-ab006af4d469
•   3     0x00021400      0x000293ff      "vendorfs"
•         attrs:  0x0000000000000000
•         type:   0fc63daf-8483-4772-8e79-3d69d8477de4
•         type:   linux
•         guid:   c1241248-0452-4a9d-a181-dd26b1b8dc4a
•   4     0x00029400      0x001a93ff      "rootfs"
•         attrs:  0x0000000000000000
•         type:   0fc63daf-8483-4772-8e79-3d69d8477de4
•         type:   linux
•         guid:   e91c4e10-16e6-4c0e-bd0e-77becf4a3582
•   5     0x001a9400      0x0075fbff      "userfs"
•         attrs:  0x0000000000000000
•         type:   0fc63daf-8483-4772-8e79-3d69d8477de4
•         type:   linux
•         guid:   91050ee0-2f8c-4a37-b0b1-54b16dfb2ec8
  

在启动之前，我将 bootargs 设置如下：

• setenv bootargs root=PARTUUID=e91c4e10-16e6-4c0e-bd0e-77becf4a3582 rw console=ttySTM0,115200
  

但是，内核找不到 rootfs 分区：

• [    3.256832] VFS: Cannot open root device "PARTUUID=e91c4e10-16e6-4c0e-bd0e-77becf4a3582" or unknown-block(0,0): error -6
• [    3.266412] Please append a correct "root=" boot option; here are the available partitions:
• [    3.274832] 0100           65536 ram0
• [    3.274837]  (driver?)
• [    3.280751] 0101           65536 ram1
• [    3.280754]  (driver?)
• [    3.286888] 0102           65536 ram2
• [    3.286892]  (driver?)
• [    3.293295] 0103           65536 ram3
• [    3.293300]  (driver?)
• [    3.299064] 0104           65536 ram4
• [    3.299067]  (driver?)
• [    3.305204] 0105           65536 ram5
• [    3.305207]  (driver?)
• [    3.311270] 0106           65536 ram6
• [    3.311273]  (driver?)
• [    3.317536] 0107           65536 ram7
• [    3.317540]  (driver?)
• [    3.323516] 0108           65536 ram8
• [    3.323520]  (driver?)
• [    3.329580] 0109           65536 ram9
• [    3.329583]  (driver?)
• [    3.335685] 010a           65536 ram10
• [    3.335688]  (driver?)
• [    3.341873] 010b           65536 ram11
• [    3.341876]  (driver?)
• [    3.348065] 010c           65536 ram12
• [    3.348068]  (driver?)
• [    3.354275] 010d           65536 ram13
• [    3.354278]  (driver?)
• [    3.360443] 010e           65536 ram14
• [    3.360446]  (driver?)
• [    3.366635] 010f           65536 ram15
• [    3.366638]  (driver?)
• [    3.372830] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
• [    3.381109] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.56 #1
• [    3.387030] Hardware name: STM32 (Device Tree Support)
• [    3.392210] [] (unwind_backtrace) from [] (show_stack+0x10/0x14)
• [    3.399953] [] (show_stack) from [] (dump_stack+0xb0/0xc4)
• [    3.407192] [] (dump_stack) from [] (panic+0x11c/0x31c)
• [    3.414167] [] (panic) from [] (mount_block_root+0x1cc/0x27c)
• [    3.421663] [] (mount_block_root) from [] (mount_root+0x124/0x148)
• [    3.429597] [] (mount_root) from [] (prepare_namespace+0x180/0x1c4)
• [    3.437622] [] (prepare_namespace) from [] (kernel_init+0x8/0x110)
• [    3.445557] [] (kernel_init) from [] (ret_from_fork+0x14/0x2c)
• [    3.453136] Exception stack(0xcf089fb0 to 0xcf089ff8)
• [    3.458197] 9fa0:                                     00000000 00000000 00000000 00000000
• [    3.466397] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
• [    3.474592] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
• [    3.481232] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---
  

关于什么可能是错误的以及如何纠正它的任何想法？