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lansecd

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

lansecd

@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) ]---

lansecd

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

lansecd

@whycanservice T113两路CAN，不要用CAN1，用CAN2就可以了

lansecd

@xiaogcc23333 计划这样，贴个SD NAND做数据盘

lansecd

@xiaogcc23333 squashfs

lansecd

@whycanservice 我也怀疑了NAND，NAND用的华邦的，温度也是-40-85。然后重新上电，spl，uboot也没反应，

lansecd

大家有做过T113的低温实验么，零下40度工作出现了下面的情况：

[    3.367765] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[    3.370354] clk: Not disabling unused clocks
[    3.377538] cfg80211: failed to load regulatory.db
[    3.382098] ALSA device list:
[    3.390698]   #0: audiocodec
[    3.391058] hub 1-1:1.0: USB hub found
[    3.393898] alloc_fd: slot 0 not NULL!
[    3.398583] hub 1-1:1.0: 4 ports detected
[    3.410969] VFS: Mounted root (squashfs filesystem) readonly on device 254:0.
[    3.420662] devtmpfs: mounted
[    3.425613] Freeing unused kernel memory: 1024K
[    3.460496] Run /sbin/init as init process
[    3.616526] init: Console is alive
[    3.620561] init: - watchdog -
[    3.624037] init: - preinit -
[    3.637034] SQUASHFS error: zlib decompression failed, data probably corrupt
[    3.647018] SQUASHFS error: squashfs_read_data failed to read block 0x1519f6
[    3.654939] SQUASHFS error: Unable to read fragment cache entry [1519f6]
[    3.662496] SQUASHFS error: Unable to read page, block 1519f6, size 1b4b8
[    3.670246] SQUASHFS error: Unable to read fragment cache entry [1519f6]
[    3.677766] SQUASHFS error: Unable to read page, block 1519f6, size 1b4b8
[    3.685448] SQUASHFS error: Unable to read fragment cache entry [1519f6]
[    3.692995] SQUASHFS error: Unable to read page, block 1519f6, size 1b4b8
[    3.700619] SQUASHFS error: Unable to read fragment cache entry [1519f6]
[    3.708063] SQUASHFS error: Unable to read page, block 1519f6, size 1b4b8
[    3.715684] SQUASHFS error: Unable to read fragment cache entry [1519f6]
[    3.723170] SQUASHFS error: Unable to read page, block 1519f6, size 1b4b8
[    3.731183] init: Failed to start kmodloader
[    3.780731] 8<--- cut here ---
[    3.784146] Unable to handle kernel paging request at virtual address 57ac6e9d
[    3.792152] pgd = a9329b06
[    3.795144] [57ac6e9d] *pgd=00000000
[    3.799103] Internal error: Oops: 805 [#1] PREEMPT SMP ARM
[    3.805176] Modules linked in:
[    3.808559] CPU: 1 PID: 1134 Comm: kworker/1:3 Not tainted 5.4.61 #239
[    3.815791] Hardware name: Generic DT based system
[    3.815806] Workqueue: ubiblock0_5 ubiblock_do_work
[    3.826514] PC is at do_wait_for_common+0xfc/0x168
[    3.831821] LR is at arch_spin_lock+0xc/0x48
[    3.836546] pc : [<c0782ca4>]    lr : [<c014f780>]    psr: 20000193
[    3.843484] sp : c72dda00  ip : 00100100  fp : 00000000
[    3.849267] r10: 00000002  r9 : c078502c  r8 : c7987748
[    3.855050] r7 : c0c04e08  r6 : c72dc000  r5 : c7987744  r4 : 000001f4
[    3.862282] r3 : 57ac6e9d  r2 : c798774c  r1 : c7987748  r0 : 00000000
[    3.862293] Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none
[    3.877506] Control: 10c5387d  Table: 46b9c06a  DAC: 00000051
[    3.883868] Process kworker/1:3 (pid: 1134, stack limit = 0xee25e517)
[    3.891000] Stack: (0xc72dda00 to 0xc72de000)
[    3.895827] da00: 00000001 c7946400 c013a534 c798774c c798774c 2429ebe8 c0c1d898 c7987748
[    3.904887] da20: c7987744 000001f4 00000002 c7987440 c8868000 00000002 c8868000 c0782d78
[    3.913952] da40: c7987440 c72ddb9c c0c2a940 c7af8c00 c7987440 c040ca54 c7ebad80 c72b9980
[    3.923014] da60: 00000113 c7af8ec8 c7986440 c8868000 c7987754 c7af8ec8 c72ddb9c 00000000
[    3.932075] da80: c72ddb9c c72ddb64 c7986000 c7986390 c7af8c00 c7a53410 c7af8ec8 c0407bc8
[    3.941136] daa0: 00000000 00000000 c72ddaec c0785f18 c72ddac0 c7986000 c72ddb20 c72ddb88
[    3.950196] dac0: c72ddb64 c79862a4 00000000 c7a53410 c7a53410 c0408104 c7986000 00000000
[    3.959258] dae0: 00000000 c7986000 c7af8c00 c72ddb64 c7af8ec8 c7986390 c04058e4 00000000
[    3.968321] db00: c79862bc c04084e4 c0c04e08 60000113 00000001 00000000 00000000 c72ddb1c
[    3.977382] db20: c72ddb1c 2429ebe8 c72ddb38 c7af8c00 c72ddb64 c796d9c2 c0c04e08 00000001
[    3.986443] db40: c72ddc7b c7af8c00 c72ddc6a c0408560 c796d9c0 c72ddb64 c796d9c2 c040866c
[    3.995503] db60: 00000002 c72ddbe0 c72ddc2c c7af8c00 00000000 c0405844 c72ddb14 00000003
[    4.004563] db80: 00000000 ffffff8d c72ddb88 c72ddb88 00000000 c72ddb94 c72ddb94 c796d9c0
[    4.013627] dba0: 00000000 00000002 00000000 00000000 00000000 00000000 00000000 00000000
[    4.022687] dbc0: 00000000 00000000 00000802 00000000 00000000 05f5e100 00000000 00000000
[    4.031748] dbe0: c72ddc2c c72ddb64 00000000 c796d9c2 00000001 00000000 00000000 00000000
[    4.040809] dc00: 00000000 00000000 00000000 00000000 00000000 00000810 00000000 00000000
[    4.049869] dc20: 05f5e100 00000000 00000000 c72ddb64 c72ddbe0 2429ebe8 c72ddcb0 c0c04e08
[    4.058931] dc40: c72ddcd8 c72ddc7b c72ddcad c7a2e858 ffff8caa c0c2a210 c0c02d00 c04025e0
[    4.067994] dc60: 00000001 0000000f c00f00c0 2429ebe8 c0c04e08 c04023ac 00a2e858 2429ebe8
[    4.077054] dc80: 2429ebe8 c7a2e858 c72ddcd8 c0c04e08 0000b6f5 08000000 c0c29e8c c7a2e858
[    4.086116] dca0: 00000000 c0402b38 c7a2e84c c000000c f5b60013 2429ebe8 c72ddcd4 00000000
[    4.095175] dcc0: c0c04e08 c7a2e858 00000000 00000000 00000000 c0403574 000002db 00000035
[    4.104235] dce0: 00000000 00000000 00000800 c0b85800 00000000 00000000 00000800 2429ebe8
[    4.113298] dd00: c7a2e880 c7a2e880 c72dddcc c72ddd28 c7a2e840 c03ffa80 c72dddcc c72ddd28
[    4.122358] dd20: c0c2a210 c0c04e08 0000016d 00000035 00000000 00000000 00001000 c0b85000
[    4.131418] dd40: 00000000 00000000 0000ac00 2429ebe8 00000000 c7b80400 00000000 00000000
[    4.140479] dd60: c7b80400 00500000 00000000 c0b84c00 c090f8af c03e1cf0 c72dddcc c03e1cbc
[    4.149538] dd80: c72dddcc 00000000 c7b80400 05674c00 00000000 c03df45c c72dddcc 00000000
[    4.158597] dda0: 05674c00 00000000 c0c04e08 c72dddcc c72dde30 05674c00 00000000 c03df514
[    4.167660] ddc0: c72dddcc c0139868 c7838000 00000000 0000b000 00000400 00000000 00000000
[    4.176720] dde0: 00000000 c0b84c00 00000000 2429ebe8 c7b23000 c7b23000 0000b000 00000159
[    4.185780] de00: 00034c00 00000004 c0b84c00 c03f7ddc 0000b000 c72dde30 c0b84c00 00000000
[    4.194840] de20: 05674c00 00000000 c7b23548 c0c04e08 00000005 2429ebe8 00000005 c7b23000
[    4.203901] de40: 00000000 00000000 00000000 c72dc000 c69a5400 c69a5400 c72dc000 c03f6414
[    4.212964] de60: 0000b000 80150011 00000005 00000159 00000000 c0b84c00 00000000 0000b000
[    4.222024] de80: c6a13cd0 0000b000 c6a13cd0 c72dc000 c7b23000 c69a5400 00000000 c03f65b4
[    4.231085] dea0: 00033c00 0000b000 00000000 c6a13cd8 c7f101e0 c69a5400 00000000 0000b000
[    4.240144] dec0: c7b23000 00033c00 00000005 c6a13cd0 00000000 c03f509c 00033c00 0000b000
[    4.249204] dee0: 00000000 2429ebe8 c6a13c00 00000000 c6a13cd0 0000b000 0000b000 c6a13c00
[    4.258264] df00: c70c2600 00000000 00000000 c03fed20 0000b000 00000000 00000000 c693a600
[    4.267327] df20: c7ec9980 c6a13cb0 ff7f1300 00000000 00000000 c6a13cb4 00000000 c012f434
[    4.276388] df40: c693a600 c6a13cb0 c693a600 c693a614 c7ec9980 c72dc000 c7ec9998 c0c02d00
[    4.285449] df60: c0c0d09c c012fa64 00000000 c7243b00 c72dc000 c693b540 c693a600 c012f830
[    4.294509] df80: c7873ec4 c7243b1c 00000000 c0134270 c693b540 c0134154 00000000 00000000
[    4.303569] dfa0: 00000000 00000000 00000000 c01010e8 00000000 00000000 00000000 00000000
[    4.312631] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    4.321691] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[    4.330763] [<c0782ca4>] (do_wait_for_common) from [<c0782d78>] (wait_for_common+0x30/0x48)
[    4.340020] [<c0782d78>] (wait_for_common) from [<c040ca54>] (sunxi_spi_transfer_one+0x500/0xb84)
[    4.349854] [<c040ca54>] (sunxi_spi_transfer_one) from [<c0407bc8>] (spi_transfer_one_message+0xd8/0x3e0)
[    4.360361]
[    4.360361] insmod_device_driver
[    4.360361]
[    4.360460] [<c0407bc8>] (spi_transfer_one_message) from [<c0408104>] (__spi_pump_messages+0x234/0x4c0)
[    4.367596] sunxi_usb_udc 4100000.udc-controller: 4100000.udc-controller supply udc not found, using dummy regulator
[    4.377695] [<c0408104>] (__spi_pump_messages) from [<c04084e4>] (__spi_sync+ 0x148/0x1a0)
[    4.377703] [<c04084e4>] (__spi_sync) from [<c0408560>] (spi_sync+0x24/0x3c)
[    4.377711] [<c0408560>] (spi_sync) from [<c040866c>] (spi_write_then_read+0xf4/0x17c)
[    4.377721] [<c040866c>] (spi_write_then_read) from [<c04025e0>] (aw_spinand_chip_read_reg+0x30/0x50)
[    4.377731] [<c04025e0>] (aw_spinand_chip_read_reg) from [<c04023ac>] (aw_spinand_chip_wait+0x48/0xd8)
[    4.377741] [<c04023ac>] (aw_spinand_chip_wait) from [<c0402b38>] (aw_spinand_chip_read_single_page+0x160/0x27c)
[    4.377751] [<c0402b38>] (aw_spinand_chip_read_single_page) from [<c0403574>](aw_spinand_chip_read_super_page+0x68/0xcc)
[    4.377764] [<c0403574>] (aw_spinand_chip_read_super_page) from [<c03ffa80>](aw_spinand_read_oob+0x16c/0x1d8)
[    4.400618] device_chose finished 139!
[    4.406265] [<c03ffa80>] (aw_spinand_read_oob) from [<c03e1cf0>] (part_read_oob+0x34/0x6c)
[    4.406276] [<c03e1cf0>] (part_read_oob) from [<c03df45c>] (mtd_read_oob+0x70/0xcc)
[    4.406285] [<c03df45c>] (mtd_read_oob) from [<c03df514>] (mtd_read+0x5c/0x84)
[    4.406296] [<c03df514>] (mtd_read) from [<c03f7ddc>] (ubi_io_read+0x124/0x2cc)
[    4.406309] [<c03f7ddc>] (ubi_io_read) from [<c03f6414>] (ubi_eba_read_leb+0x210/0x2e8)
[    4.516768] [<c03f6414>] (ubi_eba_read_leb) from [<c03f65b4>] (ubi_eba_read_leb_sg+0xc8/0x134)
[    4.516783] [<c03f65b4>] (ubi_eba_read_leb_sg) from [<c03f509c>] (ubi_leb_read_sg+0x74/0xb4)
[    4.535658] [<c03f509c>] (ubi_leb_read_sg) from [<c03fed20>] (ubiblock_do_work+0xf0/0x108)
[    4.535672] [<c03fed20>] (ubiblock_do_work) from [<c012f434>] (process_one_work+0x144/0x210)
[    4.554159] [<c012f434>] (process_one_work) from [<c012fa64>] (worker_thread+0x234/0x2d8)
[    4.563228] [<c012fa64>] (worker_thread) from [<c0134270>] (kthread+0x11c/0x128)
[    4.563240] [<c0134270>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
[    4.579413] Exception stack(0xc72ddfb0 to 0xc72ddff8)
[    4.585006] dfa0:                                     00000000 00000000 00000000 00000000
[    4.594065] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    4.603123] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[    4.610456] Code: 1affffe6 e59d3010 e59d200c e5823004 (e5832000)
[    4.617204] ---[ end trace c70083dfb240bf2b ]---
[    4.622316] note: kworker/1:3[1134] exited with preempt_count 1

lansecd

@how0723更换电脑USB口，更换USB数据线，重启电脑，检查T113板晶振工作情况

lansecd

@lansecd 在设置T113串口波特率为1M 中说：

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";
};

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>,<&ccu CLK_APB1>,<&ccu CLK_PSI_AHB>;
        clock-frequency = <50000000>;
	clock-names = "uart5";
	resets = <&ccu RST_BUS_UART5>;
	uart5_port = <5>;
	uart5_type = <2>;
	status = "disabled";
};

lansecd

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

lansecd

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lansecd

@vecare_yu 请问这个问题解决了么

lansecdLV 5

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