板子上我只连了一个USB转串口的监视线和一个5V电源。之前都一直好好的，可以正常启动。今天就一直进不了系统了，卡在最后一步，最后一部分的启动日志如下：
U-Boot 2016.07-g0536cf2a27 (Dec 09 2019 - 22:40:32 -0800)
TEGRA210
Model: NVIDIA P3450-Porg
Board: NVIDIA P3450-PORG
DRAM: 4 GiB
MMC: Tegra SD/MMC: 0, Tegra SD/MMC: 1
SF: Detected MX25U3235F with page size 256 Bytes, erase size 4 KiB, total 4 MiB
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: No ethernet found.
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc1 is current device
Scanning mmc 1:1...
Found /boot/extlinux/extlinux.conf
Retrieving file: /boot/extlinux/extlinux.conf
733 bytes read in 161 ms (3.9 KiB/s)
1: primary kernel
Retrieving file: /boot/initrd
5487751 bytes read in 288 ms (18.2 MiB/s)
Retrieving file: /boot/Image
34191368 bytes read in 1532 ms (21.3 MiB/s)
append: tegraid=21.1.2.0.0 ddr_die=4096M@2048M section=512M memtype=0 vpr_resize usb_port_owner_info=0 lane_owner_info=0 emc_max_dvfs=0 touch_id=0@63 video=tegrafb no_console_suspend=1 console=ttyS0,115200n8 debug_uartport=lsport,0 earlyprintk=uart8250-32bit,0x70006000 maxcpus=4 usbcore.old_scheme_first=1 lp0_vec=0x1000@0xff780000 core_edp_mv=1125 core_edp_ma=4000 root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyS0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 quiet
## Flattened Device Tree blob at 83100000
Booting using the fdt blob at 0x83100000
reserving fdt memory region: addr=80000000 size=20000
Using Device Tree in place at 0000000083100000, end 00000000831776f0
Starting kernel ...
<hit enter to activate fiq debugger>
[ 1.015526] tegradc tegradc.1: dpd enable lookup fail:-19
[ 1.521701] Host read timeout at address 545c00c4
[ 1.721065] imx219 7-0010: imx219_board_setup: error during i2c read probe (-121)
[ 1.721097] imx219 7-0010: board setup failed
[ 1.745174] imx219 8-0010: imx219_board_setup: error during i2c read probe (-121)
[ 1.745208] imx219 8-0010: board setup failed
[ 2.614140] cgroup: cgroup2: unknown option "nsdelegate"
[ 3.742652] using random self ethernet address
[ 3.747460] using random host ethernet address
[ 4.227897] random: crng init done
[ 4.231302] random: 7 urandom warning(s) missed due to ratelimiting
[ 5.005810] using random self ethernet address
[ 5.013513] using random host ethernet address
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