lansecd 发布的最佳帖子

@yuzukitsuru 用的芒果派Tina-Linux_20220818这个固件，我也怀疑就是II2这的问题，如果我不配置IIC AS CCI就不会段错误，这个一配上就会段错误，我再捋一下

@a892755772

@jr_online 这两个地方和你的一样，还是没有跑起来

[    2.345411] hub 2-0:1.0: USB hub found
[    2.349659] hub 2-0:1.0: 1 port detected
[    2.357934] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[    2.369727] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[    2.377228] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[    2.380544] clk: Not disabling unused clocks
[    2.386918] cfg80211: failed to load regulatory.db
[    2.391717] ALSA device list:
[    2.400452]   #0: audiocodec
[    2.403812] alloc_fd: slot 0 not NULL!
[    2.408372] /dev/root: Can't open blockdev
[    2.413024] VFS: Cannot open root device "ubiblock0_5" or unknown-block(0,0): error -6
[    2.421929] Please append a correct "root=" boot option; here are the available partitions:
[    2.431306] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    2.440572] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.61 #108
[    2.447397] Hardware name: Generic DT based system
[    2.452786] [<c010e248>] (unwind_backtrace) from [<c010a870>] (show_stack+0x10/0x14)
[    2.461472] [<c010a870>] (show_stack) from [<c07600a0>] (dump_stack+0x7c/0x98)
[    2.469573] [<c07600a0>] (dump_stack) from [<c011956c>] (panic+0x104/0x3d8)
[    2.477380] [<c011956c>] (panic) from [<c0b01270>] (mount_block_root+0x254/0x2fc)
[    2.485771] [<c0b01270>] (mount_block_root) from [<c0b014d0>] (prepare_namespace+0x138/0x178)
[    2.495329] [<c0b014d0>] (prepare_namespace) from [<c07745a0>] (kernel_init+0x8/0x10c)
[    2.504206] [<c07745a0>] (kernel_init) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[    2.512688] Exception stack(0xc7825fb0 to 0xc7825ff8)
[    2.518348] 5fa0:                                     00000000 00000000 00000000 00000000
[    2.527514] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    2.536680] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[    2.544098] CPU1: stopping
[    2.547131] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.61 #108
[    2.553956] Hardware name: Generic DT based system
[    2.559329] [<c010e248>] (unwind_backtrace) from [<c010a870>] (show_stack+0x10/0x14)
[    2.568011] [<c010a870>] (show_stack) from [<c07600a0>] (dump_stack+0x7c/0x98)
[    2.576108] [<c07600a0>] (dump_stack) from [<c010c648>] (handle_IPI+0xcc/0x168)
[    2.584305] [<c010c648>] (handle_IPI) from [<c033849c>] (gic_handle_irq+0x70/0x78)
[    2.592793] [<c033849c>] (gic_handle_irq) from [<c01021cc>] (__irq_svc+0x6c/0xa8)
[    2.601177] Exception stack(0xc7865f80 to 0xc7865fc8)
[    2.606838] 5f80: 0000063c c7ecb4f4 00000000 c0114b40 00000002 c7864000 c0c04e28 c0c04e64
[    2.616006] 5fa0: 4000406a 410fc075 00000000 00000000 c0c627d0 c7865fd0 c0107f94 c0107f84
[    2.625169] 5fc0: 60000113 ffffffff
[    2.629080] [<c01021cc>] (__irq_svc) from [<c0107f84>] (arch_cpu_idle+0x1c/0x38)
[    2.637373] [<c0107f84>] (arch_cpu_idle) from [<c013de94>] (do_idle+0xd0/0x120)
[    2.645568] [<c013de94>] (do_idle) from [<c013e180>] (cpu_startup_entry+0x18/0x20)
[    2.654054] [<c013e180>] (cpu_startup_entry) from [<40102bec>] (0x40102bec)
[    2.661872] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---

回复: T113+tina，RMII连接10Mbps/Half，能发送，不能接收

用UART5非标准波率通信，波特率设置为1M，应用程序中串口配置如下：

	//open uart
	fd = open("/dev/ttyS5", O_RDWR);
	if (fd < 0)
	{
		printf("open failed\n");
		return -1;
	}

	/*set baudrate*/
	tcgetattr(fd, &options);
	cfsetispeed(&options, B1000000);
	cfsetospeed(&options, B1000000);
	options.c_cflag |= (CLOCAL | CREAD);

	/*set databits*/
	options.c_cflag &= ~CSIZE;
	options.c_cflag |= CS8;

	/*set crc*/
	options.c_cflag &= ~PARENB;
	options.c_cflag &= ~CSTOPB;

	/*set stopbits*/
	options.c_cflag &= ~CSTOPB; 

	/*set parity*/
	options.c_cflag &= ~PARENB;

	options.c_lflag  &= ~(ICANON | ECHO | ECHOE | ISIG);  
	options.c_oflag  &= ~OPOST;  

	options.c_cc[VTIME] = 0;
	options.c_cc[VMIN] = 0;

系统启动后，启动应用程序，发现报如下错误：

[  241.774864] sw_uart_check_baudset()837 - uart5, select set 5, baud 1000000, uartclk 24000000 beyond rance[31000000, 120000000]

发现串口的时钟源为24MHZ，不支持该波特率设置，于是查看Linux_UART_开发指南.pdf，查找波特率的修改方法，具体可以查看该开发指南，这里贴出修改方法。

修改设备树，修改串口的时钟源
/lichee/linux-5.4/arch/arm/boot/dts/sun8iw20p1.dtsi

uart5: uart@2501400 {
	compatible = "allwinner,sun8i-uart";
	device_type = "uart5";
	reg = <0x0 0x02501400 0x0 0x400>;
	interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
	sunxi,uart-fifosize = <256>;
	clocks = <&ccu CLK_BUS_UART5>;
	clock-names = "uart5";
	resets = <&ccu RST_BUS_UART5>;
	uart5_port = <5>;
	uart5_type = <2>;
	status = "disabled";
};

编译，烧录，启动发现终端乱码，这里把终端串口的时钟源也进行修改

uart0: uart@2500000 {
	compatible = "allwinner,sun8i-uart";
	device_type = "uart0";
	reg = <0x0 0x02500000 0x0 0x400>;
	interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
	sunxi,uart-fifosize = <64>;
	clocks = <&ccu CLK_BUS_UART0>,<&ccu CLK_APB1>,<&ccu CLK_PSI_AHB>;
	clock-frequency = <50000000>;
	clock-names = "uart0";
	resets = <&ccu RST_BUS_UART0>;
	uart0_port = <0>;
	uart0_type = <2>;
	status = "disabled";
};

再次，烧录，启动，运行程序，进行数据收发测试

可以参考这个
链接文本

@lansecd Tina-Linux-20220815

@lyg116 T113-S3可以做到双屏（mipi+mipi）同显和异显。可以看看你那边具体是啥样的需求了，也可以发过来看看（meetyoo93@163.com）