按照论坛里的大佬操作也不行，按官方文档更改也不行，还是通过emmc启动，启动报错如下，麻烦大佬们帮我看一下，谢谢了。```
code_text
gned bus number 1
[ 2.353817] sunxi-ehci 4200000.ehci1-controller: irq 49, io mem 0x04200000
[ 2.384935] sunxi-ehci 4200000.ehci1-controller: USB 2.0 started, EHCI 1.00
[ 2.393865] hub 1-0:1.0: USB hub found
[ 2.398191] hub 1-0:1.0: 1 port detected
[ 2.403801] get ohci1-controller wakeup-source is fail.
[ 2.409835] sunxi ohci1-controller don't init wakeup source
[ 2.416130] [sunxi-ohci1]: probe, pdev->name: 4200400.ohci1-controller, sunxi _ohci: 0xffffffe000662680
[ 2.426925] sunxi-ohci 4200400.ohci1-controller: 4200400.ohci1-controller sup ply hci not found, using dummy regulator
[ 2.439400] sunxi-ohci 4200400.ohci1-controller: OHCI Host Controller
[ 2.446694] sunxi-ohci 4200400.ohci1-controller: new USB bus registered, assi gned bus number 2
[ 2.456578] sunxi-ohci 4200400.ohci1-controller: irq 50, io mem 0x04200400
[ 2.530026] hub 2-0:1.0: USB hub found
[ 2.534267] hub 2-0:1.0: 1 port detected
[ 2.541719] get usb_detect_mode is fail, -22
[ 2.546608] get det_vbus is fail, -84
[ 2.550691] get id is fail, -84
[ 2.556759] platform regulatory.0: Direct firmware load for regulatory.db fai led with error -2
[ 2.566462] clk: Not disabling unused clocks
[ 2.571262] ALSA device list:
[ 2.574570] #0: audiocodec
[ 2.577863] cfg80211: failed to load regulatory.db
[ 2.583268] alloc_fd: slot 0 not NULL!
[ 2.588002] VFS: Cannot open root device "mmcblk0p5" or unknown-block(0,0): e rror -6
[ 2.596728] Please append a correct "root=" boot option; here are the availab le partitions:
[ 2.606158] 1f00 1024 mtdblock0
[ 2.606162] (driver?)
[ 2.613450] 1f01 4096 mtdblock1
[ 2.613452] (driver?)
[ 2.620855] 1f02 1024 mtdblock2
[ 2.620859] (driver?)
[ 2.628184] 1f03 124928 mtdblock3
[ 2.628187] (driver?)
[ 2.635496] Kernel panic - not syncing: VFS: Unable to mount root fs on unkno wn-block(0,0)
[ 2.644713] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.61 #130
[ 2.651306] Call Trace:
[ 2.654047] [<ffffffe000023d56>] walk_stackframe+0x0/0x70
[ 2.660069] [<ffffffe000027d2c>] panic+0xdc/0x266
[ 2.665318] [<ffffffe000000d9c>] mount_block_root+0x1fe/0x266
[ 2.671728] [<ffffffe000000fc2>] prepare_namespace+0x136/0x144
[ 2.678231] [<ffffffe0004242a2>] rest_init+0xbc/0xc0
[ 2.683765] [<ffffffe0004242b0>] kernel_init+0xa/0xe8
[ 2.689393] [<ffffffe0004242a2>] rest_init+0xbc/0xc0
[ 2.694926] [<ffffffe000022d5c>] ret_from_syscall+0xa/0xe
[ 2.700953] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---