1.251742] using random self ethernet address
[ 1.256381] using random host ethernet address
[ 1.262729] usb0: HOST MAC 96:ed:94:7a:2b:0a
[ 1.267116] usb0: MAC 7e:77:19:2d:4c:a0
[ 1.271133] g_cdc gadget: CDC Composite Gadget, version: King Kamehameha Day 2008
[ 1.278713] g_cdc gadget: g_cdc ready
[ 1.283301] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 1.300806] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 1.307698] vcc3v3: disabling
[ 1.310683] ALSA device list:
[ 1.313732] #0: Loopback 1
[ 1.317488] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 1.326237] cfg80211: failed to load regulatory.db
[ 1.332859] VFS: Cannot open root device "mtdblock3" or unknown-block(0,0): error -19
[ 1.340745] Please append a correct "root=" boot option; here are the available partitions:
[ 1.349176] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 1.357436] CPU: 0 PID: 1 Comm: swapper Not tainted 4.15.0-rc8-licheepi-nano+ #1
[ 1.364810] Hardware name: Allwinner suniv Family
[ 1.369595] [<c010e550>] (unwind_backtrace) from [<c010b6a8>] (show_stack+0x10/0x14)
[ 1.377350] [<c010b6a8>] (show_stack) from [<c0116878>] (panic+0xb8/0x230)
[ 1.384252] [<c0116878>] (panic) from [<c0901190>] (mount_block_root+0x170/0x250)
[ 1.391742] [<c0901190>] (mount_block_root) from [<c0901364>] (mount_root+0xf4/0x120)
[ 1.399574] [<c0901364>] (mount_root) from [<c09014b8>] (prepare_namespace+0x128/0x188)
[ 1.407578] [<c09014b8>] (prepare_namespace) from [<c0900dc0>] (kernel_init_freeable+0x174/0x1b8)
[ 1.416443] [<c0900dc0>] (kernel_init_freeable) from [<c064faf0>] (kernel_init+0x8/0x10c)
[ 1.424619] [<c064faf0>] (kernel_init) from [<c0107dc0>] (ret_from_fork+0x14/0x34)
[ 1.432180] Rebooting in 5 seconds..
[ 7.411416] Reboot failed -- System halted系统烧录后串口打印出来的，无法启动，请问是啥问题
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