[ 1.883516] /dev/root: Can't open blockdev
[ 1.888118] VFS: Cannot open root device "ubiblock0_5" or unknown-block(0,0): error -6
[ 1.897030] Please append a correct "root=" boot option; here are the available partitions:
[ 1.906413] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 1.915691] CPU0: stopping
[ 1.918729] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.61 #43
[ 1.925465] Hardware name: Generic DT based system
[ 1.930859] [<c010df08>] (unwind_backtrace) from [<c010a698>] (show_stack+0x10/0x14)
[ 1.939552] [<c010a698>] (show_stack) from [<c0666870>] (dump_stack+0x88/0xa4)
[ 1.947659] [<c0666870>] (dump_stack) from [<c010c2d4>] (handle_IPI+0xe4/0x180)
[ 1.955864] [<c010c2d4>] (handle_IPI) from [<c032330c>] (gic_handle_irq+0x70/0x78)
[ 1.964362] [<c032330c>] (gic_handle_irq) from [<c01021cc>] (__irq_svc+0x6c/0xa8)
[ 1.972757] Exception stack(0xc0a01f40 to 0xc0a01f88)
[ 1.978425] 1f40: 00000e68 c76b8334 00000000 c0114860 00000001 c0a00000 c0a03de4 c0a03e20
[ 1.987606] 1f60: c0a42000 c77ff540 c09280c0 00000000 00000001 c0a01f90 c0107fd0 c0107fc0
[ 1.996781] 1f80: 60000013 ffffffff
[ 2.000699] [<c01021cc>] (__irq_svc) from [<c0107fc0>] (arch_cpu_idle+0x1c/0x38)
[ 2.009001] [<c0107fc0>] (arch_cpu_idle) from [<c013d694>] (do_idle+0xd4/0x128)
[ 2.017202] [<c013d694>] (do_idle) from [<c013d978>] (cpu_startup_entry+0x18/0x20)
[ 2.025699] [<c013d978>] (cpu_startup_entry) from [<c0900c80>] (start_kernel+0x360/0x3ec)
[ 2.034881] [<c0900c80>] (start_kernel) from [<00000000>] (0x0)
[ 2.041529] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---

使用的是SPI NAND，如果烧录到TF卡就正常启动，用NAND就找不到rootfs,实在是找不到问题了