@whycan 解决了，ext2 要打开

T113-S3的can总线有人调通了吗？

内核日志如下：

[ 6.242776] sunxi-i2c sunxi-i2c3: SLA+W has been transmitted; ACK not received
[ 6.250832] sunxi-i2c sunxi-i2c3: engine-mode: xfer failed(dev addr:0x32

是怎么回事

已解决，串口驱动的时钟配置问题，可以搜索其他帖子

T113-S3串口UART0 接收错误，波特率115200时正常，波特率460800时错误

串口错误标志位解读：
FE：帧错误，指示当前字符是否存在帧错误(缺少停止位)并且可能已经损坏
BRK:BREAK检测，指示当前字符是否为BREAK字符，数据位和停止位均为0
OE：接收器超限，指示接收过程中，是否存在数据来不及接收的现象
PRERR：RS-485模式下，它保存接收到的9位RS-485数据的第9个数据位。在RS-232/IrDA模式下，它是奇偶校验错误标志。指示是否检测到当前字符是否具有奇偶校验错误并且可能已经损坏
Error Detect:错误检测，指示RX_DATA字段是否具有错误-OE FE BRK PRERR

测出来的波形，黄色是RS232 绿色是TTL

有没有可能是驱动的问题？

@how0723 @whycan

@whycan
系统中有个文件

@whycan 怎么使用

由RTL8723BU换成RTL8723DU，就驱动不起来

  4.978620] rtk_btusb: Realtek Bluetooth USB driver ver 3.1.981c756.20211102-175222
[    5.022481] rtk_btusb: btusb_probe intf->cur_altsetting->desc.bInterfaceNumber 0
[    5.030838] rtk_btusb: btusb_probe can_wakeup 1, may wakeup 0
[    5.037302] rtk_btusb: patch_add
[    5.040933] rtk_btusb: auto suspend is disabled
[    5.046015] rtk_btusb: pid = 0xd723
[    5.049973] rtk_btusb: patch_add: Reset gEVersion to 0xff
[    5.056060] rtk_btusb: set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
[    5.068458] rtk_btusb: btusb_probe: done
[    5.072425] rtk_btusb: btusb_open start
[    5.073136] usbcore: registered new interface driver rtk_btusb
[    5.077168] rtk_btusb: btusb_open hdev->promisc ==0
[    5.099514] rtk_btusb: download_patch start
[    5.104220] rtk_btusb: chip type value: 0x71
[    5.115795] rtk_btusb: HCI reset.
[    5.169212] rtk_btusb: read_ver_rsp->lmp_subver = 0x8723
[    5.175177] rtk_btusb: read_ver_rsp->hci_rev = 0xd
[    5.175181] rtk_btusb: patch_entry->lmp_sub = 0x8723
[    5.175184] rtk_btusb: load_firmware start
[    5.175188] rtk_btusb: lmp_version = 0x8723
[    5.175191] rtk_btusb: config filename rtl8723du_config
[    5.175412] usb 1-1.1: Direct firmware load for rtl8723du_config failed with error -2
[    5.175424] rtk_btusb: fw name is  rtl8723du_fw
[    5.179453] usb 1-1.1: Direct firmware load for rtl8723du_fw failed with error -2
[    5.219000] rtk_btusb: load firmware failed!
[    5.232288] rtk_btusb: Rtk patch end -1
[    5.257784] rtk_btusb: btusb_open failed

@a850874651 谢谢，请问mbr是什么作用？