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串口连接线如图所示，核电脑端就是usb连接。
TXD不连接时，可以正常打印，TXD连上后就打印乱码了。切换到uart3后的打印如下：
正常打印：
mount: /oem: wrong fs type, bad option, bad superblock on /dev/mmcblk0p8, missing codepage or helper program, or other error.
[ 1.708077] EXT4-fs (mmcblk0p9): VFS: Can't find ext4 filesystem
mount: /userdata: wrong fs type, bad option, bad superblock on /dev/mmcblk0p9, missing codepage or helper program, or other error.
Starting syslogd: OK
Starting klogd: OK
[ 1.800771] mmc3 mmc_send_io_op_cond err: -110
Running sysctl: OK
Populating /dev using udev: [ 1.874631] udevd[156]: starting version 3.2.10
[ 1.889444] udevd[157]: starting eudev-3.2.10
done
Saving random seed: OK
Will now mount all partitions in /etc/fstab
Note: Will skip fsck, remove /.skip_fsck to enable
Handling /dev/root / ext4 rw,noauto 1
/bin/disk-helper: line 328: findmnt: command not found
Resizing /dev/mmcblk0p7(ext4)
resize2fs 1.46.5 (30-Dec-2021)
[ 2.424787] EXT4-fs (mmcblk0p7): resizing filesystem from 25645 to 1572864 blocks
[ 2.471605] EXT4-fs (mmcblk0p7): resized filesystem to 1572864
Filesystem at /dev/mmcblk0p7 is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/mmcblk0p7 is now 1572864 (4k) blocks long.
Handling tmpfs /tmp tmpfs mode=1777 0
Handling tmpfs /run tmpfs mode=0755,nosuid,nodev 0
Handling proc /proc proc defaults 0
Handling devtmpfs /dev devtmpfs defaults 0
Handling devpts /dev/pts devpts mode=0620,ptmxmode=0666,gid=5 0
Handling tmpfs /dev/shm tmpfs nosuid,nodev,noexec 0
Handling sysfs /sys sysfs defaults 0
Handling configfs /sys/kernel/config configfs defaults 0
Handling debugfs /sys/kernel/debug debugfs defaults 0
Handling pstore /sys/fs/pstore pstore defaults 0
Handling /dev/block/by-name/oem /oem ext2 defaults 2
Mounting /dev/mmcblk0p8(ext2) on /oem with -o defaults
[ 2.911526] FAT-fs (mmcblk0p8): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
mount: /oem: wrong fs type, bad option, bad superblock on /dev/mmcblk0p8, missing codepage or helper program, or other error.
Handling /dev/block/by-name/userdata /userdata ext2 defaults 2
Mounting /dev/mmcblk0p9(ext2) on /userdata with -o defaults
[ 3.013185] FAT-fs (mmcblk0p9): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
mount: /userdata: wrong fs type, bad option, bad superblock on /dev/mmcblk0p9, missing codepage or helper program, or other error.
Log saved to /tmp/mount-all.log
starting bootanim... Starting bootanim: 437...
Starting hook: /etc/bootanim.d/gst-bootanim.sh...
done.
Starting network: OK
Starting /usr/bin/usbdevice start, log saved to /tmp/usbdevice.log
[ 3.531782] file system registered
[ 3.590654] read descriptors
[ 3.590728] read strings
[ 3.657843] dwc3 fcc00000.dwc3: failed to enable ep0out
Starting input-event-daemon: /bin/list-iodomain.sh version: V1.0.1
done
install io command first!!!
root@rk356x:/#
当按前面所述切换为UART3时，uart2上的打印会卡住的位置：
[ 0.003825] Mount-cache hash table entries: 8192 (order: 4, 65536 bytes)
[ 0.004472] Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes)
[ 0.006449] ASID allocator initialised with 32768 entries
[ 0.007075] rcu: Hierarchical SRCU implementation.
[ 0.009547] Platform MSI: interrupt-controller@fd440000 domain created
[ 0.010546] PCI/MSI: /interrupt-controller@fd400000/interrupt-controller@fd440000 domain created
[ 0.012179] smp: Bringing up secondary CPUs ...
I/TC: Secondary CPU 1 initializing
I/TC: Secondary CPU 1 switching to normal world boot
I/TC: Secondary CPU 2 initializing
I/TC: Secondary CPU 2 switching to normal world boot
[ 0.013862] Detected VIPT I-cache on CPU1
[ 0.013894] GICv3: CPU1: found redistributor 100 region 0:0x00000000fd480000
[ 0.013936] CPU1: using LPI pending table @0x0000000008380000
[ 0.013984] CPU1: Booted secondary processor 0x0000000100 [0x412fd050]
[ 0.015313] Detected VIPT I-cache on CPU2
[ 0.015339] GICv3: CPU2: found redistributor 200 region 0:0x00000000fd4a0000
[ 0.015375] CPU2: using LPI pending table @0x0000000008390000
[ 0.015411] CPU2: Booted secondary processor 0x0000000200 [0x412fd050]
[ 0.015512] smp: Brought up 1 node, 3 CPUs
[ 0.020292] SMP: Total of 3 processors activated.
[ 0.020738] CPU features: detected: GIC system register CPU interface
[ 0.021345] CPU features: detected: Privileged Access Never
[ 0.021869] CPU features: detected: LSE atomic instructions
[ 0.022408] CPU features: detected: User Access Override
[ 0.022910] CPU features: detected: 32-bit EL0 Support
[ 0.023395] CPU features: detected: RAS Extension Support
[ 0.024022] CPU: All CPU(s) started at EL2
[ 0.024427] alternatives: patching kernel code
[ 0.029641] devtmpfs: initialized
[ 0.050003] Registered cp15_barrier emulation handler
[ 0.050494] Registered setend emulation handler
[ 0.051159] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6370867519511994 ns
[ 0.052085] futex hash table entries: 1024 (order: 4, 65536 bytes)
[ 0.053313] pinctrl core: initialized pinctrl subsystem
[ 0.054625] NET: Registered protocol family 16
[ 0.058160] cpuidle: using governor menu
[ 0.058552] Registered FIQ tty driver
[ 0.059298] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
[ 0.060884] DMA: preallocated 256 KiB pool for atomic allocations
[ 0.064212] ramoops: dmesg-0 0x20000@0x0000000000110000
[ 0.065829] ramoops: console 0x80000@0x0000000000130000
[ 0.066342] ramoops: pmsg 0x50000@0x00000000001b0000
[ 0.067145] console [pstore-1] enabled
[ 0.067501] pstore: Registered ramoops as persistent store backend
[ 0.068085] ramoops: attached 0xf0000@0x110000, ecc: 0/0
[ 0.090032] platform 7c00000.rpmsg: assigned reserved memory node rpmsg-dma@8000000
[ 0.097822] rockchip-gpio fdd60000.gpio: probed gpio0 (fdd60000.gpio)
[ 0.098968] rockchip-gpio fe740000.gpio: probed gpio1 (fe740000.gpio)
[ 0.100045] rockchip-gpio fe750000.gpio: probed gpio2 (fe750000.gpio)
[ 0.101125] rockchip-gpio fe760000.gpio: probed gpio3 (fe760000.gpio)
[ 0.102227] rockchip-gpio fe770000.gpio: probed gpio4 (fe770000.gpio)
[ 0.102917] rockchip-pinctrl pinctrl: probed pinctrl
[ 0.113739] cryptd: max_cpu_qlen set to 1000
[ 0.115615] console [ttyFIQ0] enabled
[ 0.116003] bootconsole [uart8250] disabled
I/TC: Secondary CPU 3 initializing
I/TC: Secondary CPU 3 switching to normal world boot
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发表于 2025-8-6 17:48:35
楼主
