TI中文支持网大家好，我们的板子现在uart3操作不正常，具体是在串口发送数据时返回失败(return -1)，接收也全是误码，后来看了一下属性如下：
root@am335x-evm:~# ls -l /dev/ttyO*
crw——- 1 root tty 245, 0 Apr 24 11:09 /dev/ttyO0
crw-rw—- 1 root dialout 245, 1 Apr 24 11:06 /dev/ttyO1
crw-rw—- 1 root dialout 245, 2 Apr 24 11:06 /dev/ttyO2
crw–w—- 1 root tty 245, 3 Apr 24 11:06 /dev/ttyO3
crw-rw—- 1 root dialout 245, 4 Apr 24 11:06 /dev/ttyO4
crw-rw—- 1 root dialout 245, 5 Apr 24 11:06 /dev/ttyO5
为什么我ttyO1到O5只有O3属于tty，而其他的都属于dialout？会和这个有关系么？在哪可以改成dialout？
Jian Zhou：
请问是哪个版本的Linux？
Zhihua Zhang：
额，改过了，和用户组没关系
Zhihua Zhang：
回复 Jian Zhou:
在ti-processor-sdk-linux-am335x-evm-03.02.00.05上开发的
Zhihua Zhang：
回复 Jian Zhou:
Hi,Jian Zhou,
为什么在系统启动的时候会调用ttyO3这个串口？不停的往里面写入数据，我在tty_io.c的tty_write函数里增加了打印信息，发现在系统启动过程中不停的调用tty_write，再有Started Serial Getty on ttyO3这是启动什么服务？打印如下：
[ 1.180094] [drm] Initialized drm 1.1.0 20060810[ 1.194723] loop: module loaded[ 1.203025] libphy: Fixed MDIO Bus: probed[ 1.269063] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6[ 1.275507] davinci_mdio 4a101000.mdio: detected phy mask fffffff5[ 1.283714] libphy: 4a101000.mdio: probed[ 1.287959] davinci_mdio 4a101000.mdio: phy[1]: device 4a101000.mdio:01, driver unknown[ 1.296517] davinci_mdio 4a101000.mdio: phy[3]: device 4a101000.mdio:03, driver unknown[ 1.305916] cpsw 4a100000.ethernet: Detected MACID = 84:eb:18:bd:a8:9c[ 1.313178] cpsw 4a100000.ethernet: cpts: overflow check period 850[ 1.320895] cpsw 4a100000.ethernet: cpsw: Detected MACID = 84:eb:18:bd:a8:9e[ 1.330283] mousedev: PS/2 mouse device common for all mice[ 1.336959] i2c /dev entries driver[ 1.342082] cpuidle: enable-method property 'ti,am3352' found operations[ 1.350323] omap_hsmmc 48060000.mmc: Got CD GPIO[ 1.392690] ledtrig-cpu: registered to indicate activity on CPUs[ 1.408458] NET: Registered protocol family 10[ 1.415253] sit: IPv6 over IPv4 tunneling driver[ 1.421301] NET: Registered protocol family 17[ 1.426374] Key type dns_resolver registered[ 1.431398] omap_voltage_late_init: Voltage driver support not added[ 1.443078] omap-gpmc 50000000.gpmc: GPMC revision 6.0[ 1.448674] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000[ 1.455260] mmc0: host does not support reading read-only switch, assuming write-enable[ 1.465497] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda[ 1.472393] nand: Micron MT29F2G08ABAEAWP[ 1.476762] mmc0: new high speed SDHC card at address 59b4[ 1.482585] nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64[ 1.491431] mmcblk0: mmc0:59b4 00000 14.9 GiB[ 1.496687] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme[ 1.502910] 10 ofpart partitions found on MTD device 8000000.nand[ 1.509524] mmcblk0: p1 p2[ 1.512812] Creating 10 MTD partitions on "8000000.nand":[ 1.518513] 0x000000000000-0x000000020000 : "NAND.SPL"[ 1.526476] 0x000000020000-0x000000040000 : "NAND.SPL.backup1"[ 1.534168] 0x000000040000-0x000000060000 : "NAND.SPL.backup2"[ 1.541841] 0x000000060000-0x000000080000 : "NAND.SPL.backup3"[ 1.549519] 0x000000080000-0x0000000c0000 : "NAND.u-boot-spl-os"[ 1.557353] 0x0000000c0000-0x0000001c0000 : "NAND.u-boot"[ 1.564890] 0x0000001c0000-0x0000001e0000 : "NAND.u-boot-env"[ 1.572502] 0x0000001e0000-0x000000200000 : "NAND.u-boot-env.backup1"[ 1.580880] 0x000000200000-0x000000a00000 : "NAND.kernel"[ 1.590852] 0x000000a00000-0x000010000000 : "NAND.file-system"[ 1.707967] tps65217 0-0024: TPS65217 ID 0x6 version 1.2[ 1.716450] rtc-ds3232 0-0068: rtc core: registered ds3232 as rtc0[ 1.723060] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz[ 1.731133] ubi0: attaching mtd9[ 2.713573] ubi0: scanning is finished[ 2.727635] ubi0: attached mtd9 (name "NAND.file-system", size 246 MiB)[ 2.734724] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes[ 2.741989] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 512[ 2.749066] ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096[ 2.756401] ubi0: good PEBs: 1968, bad PEBs: 0, corrupted PEBs: 0[ 2.762834] ubi0: user volume: 1, internal volumes: 1, max. volumes count: 128[ 2.770461] ubi0: max/mean erase counter: 2/0, WL threshold: 4096, image sequence number: 350408399[ 2.780006] ubi0: available PEBs: 0, total reserved PEBs: 1968, PEBs reserved for bad PEB handling: 40[ 2.789838] ubi0: background thread "ubi_bgt0d" started, PID 62[ 2.796948] rtc-ds3232 0-0068: setting system clock to 2018-04-24 13:51:20 UTC (1524577880)[ 2.810488] ALSA device list:[ 2.813644] No soundcards found.[ 2.829059] UBIFS (ubi0:0): background thread "ubifs_bgt0_0" started, PID 63[ 2.856602] UBIFS (ubi0:0): recovery needed[ 2.929433] UBIFS (ubi0:0): recovery completed[ 2.934260] UBIFS (ubi0:0): UBIFS: mounted UBI device 0, volume 0, name "rootfs"[ 2.942097] UBIFS (ubi0:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes[ 2.952565] UBIFS (ubi0:0): FS size: 242905088 bytes (231 MiB, 1913 LEBs), journal size 9023488 bytes (8 MiB, 72 LEBs)[ 2.963862] UBIFS (ubi0:0): reserved for root: 0 bytes (0 KiB)[ 2.970032] UBIFS (ubi0:0): media format: w4/r0 (latest is w4/r0), UUID CCEA4194-22A7-4F64-88E2-BE0C3D297256, small LPT model[ 2.983524] VFS: Mounted root (ubifs filesystem) on device 0:14.[ 2.991205] devtmpfs: mounted[ 2.994775] Freeing unused kernel memory: 260K (c08b9000 – c08fa000)[ 3.001510] This architecture does not have kernel memory protection.[ 3.276066] random: systemd: uninitialized urandom read (16 bytes read, 7 bits of entropy available)[ 3.309169] random: systemd: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 3.332729] systemd[1]: systemd 229 running in system mode. (+PAM -AUDIT -SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP -LIBCRYPTSETUP -GCRYPT +GNUTLS +ACL +XZ -LZ4 -SECCOMP +BLKID -ELFUTILS +KMOD -IDN)[ 3.353407] systemd[1]: Detected architecture arm.
Welcome to 1mArago 2016.100m!
[ 3.381458] systemd[1]: Set hostname to <am335x-evm>.[ 3.576765] random: systemd-sysv-ge: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 3.611523] random: systemd-sysv-ge: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 3.677418] random: systemd: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 3.738376] random: systemd: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 3.748800] random: systemd: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 3.759907] random: systemd: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 3.825145] random: systemd: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 3.861553] random: systemd: uninitialized urandom read (16 bytes read, 8 bits of entropy available)[ 4.147355] systemd[1]: Listening on /dev/initctl Compatibility Named Pipe.[0;32m OK 0m] Listening on /dev/initctl Compatibility Named Pipe.[ 4.180845] systemd[1]: Listening on Network Service Netlink Socket.[0;32m OK 0m] Listening on Network Service Netlink Socket.[ 4.209775] systemd[1]: Listening on udev Control Socket.[0;32m OK 0m] Listening on udev Control Socket.[ 4.229764] systemd[1]: Started Forward Password Requests to Wall Directory Watch.[0;32m OK 0m] Started Forward Password Requests to Wall Directory Watch.[ 4.290656] systemd[1]: Created slice User and Session Slice.[0;32m OK 0m] Created slice User and Session Slice.[ 4.319988] systemd[1]: Listening on Journal Socket.[0;32m OK 0m] Listening on Journal Socket.[ 4.341023] systemd[1]: Created slice System Slice.[0;32m OK 0m] Created slice System Slice.[ 4.361071] systemd[1]: Created slice system-serial\x2dgetty.slice.[0;32m OK 0m] Created slice system-serial\x2dgetty.slice.[ 4.396272] systemd[1]: Mounting Temporary Directory… Mounting Temporary Directory…[ 4.435470] systemd[1]: Mounting Debug File System… Mounting Debug File System…[ 4.516958] systemd[1]: Starting Setup Virtual Console… Starting Setup Virtual Console…[ 4.589619] systemd[1]: Reached target Slices.[0;32m OK 0m] Reached target Slices.[ 4.609480] systemd[1]: Reached target Remote File Systems.[0;32m OK 0m] Reached target Remote File Systems.[ 4.629644] systemd[1]: Listening on Syslog Socket.[0;32m OK 0m] Listening on Syslog Socket.[ 4.651153] systemd[1]: Created slice system-getty.slice.[0;32m OK 0m] Created slice system-getty.slice.[ 4.689995] systemd[1]: Starting Apply Kernel Variables… Starting Apply Kernel Variables…[ 4.729879] systemd[1]: Listening on Journal Socket (/dev/log).[0;32m OK 0m] Listening on Journal Socket (/dev/log).[ 4.765045] systemd[1]: Starting Journal Service… Starting Journal Service…[ 4.814379] systemd[1]: Starting Create list of required static device nodesfor the current kernel… Starting Create list of required st… nodes for the current kernel…[ 4.890027] systemd[1]: Started Dispatch Password Requests to Console Directory Watch.[0;32m OK 0m] Started Dispatch Password Requests to Console Directory Watch.[ 4.929594] systemd[1]: Reached target Paths.[0;32m OK 0m] Reached target Paths.[ 4.959563] systemd[1]: Reached target Swap.[0;32m OK 0m] Reached target Swap.[ 4.995166] systemd[1]: Starting Remount Root and Kernel File Systems… Starting Remount Root and Kernel File Systems…[ 5.060762] systemd[1]: Listening on udev Kernel Socket.[0;32m OK 0m] Listening on udev Kernel Socket.[ 5.144969] systemd[1]: Mounting POSIX Message Queue File System… Mounting POSIX Message Queue File System…[ 5.228769] systemd[1]: Mounted Debug File System.[0;32m OK 0m] Mounted Debug File System.[ 5.249688] systemd[1]: Mounted POSIX Message Queue File System.[0;32m OK 0m] Mounted POSIX Message Queue File System.[ 5.269549] systemd[1]: Mounted Temporary Directory.[0;32m OK 0m] Mounted Temporary Directory.[ 5.290312] systemd[1]: Started Journal Service.[0;32m OK 0m] Started Journal Service.[0;32m OK 0m] Started Setup Virtual Console.[0;32m OK 0m] Started Apply Kernel Variables.[0;32m OK 0m] Started Create list of required sta…ce nodes for the current kernel.[0;32m OK 0m] Started Remount Root and Kernel File Systems. Starting udev Coldplug all Devices… Starting Create Static Device Nodes in /dev… Starting Flush Journal to Persistent Storage…[0;32m OK 0m] Started Create Static Device Nodes in /dev.[ 6.956940] systemd-journald[93]: Received request to flush runtime journal from PID 1[0;32m OK 0m] Started Flush Journal to Persistent Storage.[0;32m OK 0m] Reached target Local File Systems (Pre). Mounting /media/ram… Mounting /var/volatile… Starting udev Kernel Device Manager…[0;32m OK 0m] Mounted /var/volatile.[0;32m OK 0m] Mounted /media/ram.[0;32m OK 0m] Started udev Kernel Device Manager. Starting Load/Save Random Seed…[0;32m OK 0m] Reached target Local File Systems. Starting Create Volatile Files and Directories…[0;32m OK 0m] Started Load/Save Random Seed.[0;32m OK 0m] Started Create Volatile Files and Directories.[ 9.402985] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec[ 9.472106] 47401300.usb-phy supply vcc not found, using dummy regulator[ 9.621925] 47401b00.usb-phy supply vcc not found, using dummy regulator[0;32m OK 0m] Started udev Coldplug all Devices.[ 10.138227] spidev spi1.1: buggy DT: spidev listed directly in DT[0;32m OK 0m] Found device /dev/ttyO0.[ 10.175510] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20[ 10.235961] ————[ cut here ]————[ 10.295512] WARNING: CPU: 0 PID: 169 at drivers/spi/spidev.c:719 spidev_probe+0x1a8/0x1c4 [spidev]()[ 10.410793] Modules linked in: omap_rng rng_core spidev(+) musb_am335x omap_wdt sch_fq_codel[ 10.442564] CPU: 0 PID: 169 Comm: systemd-udevd Not tainted 4.4.32-gadde2ca9f8 #71[ 10.512782] Hardware name: Generic AM33XX (Flattened Device Tree)[ 10.570717] Backtrace:[ 10.573386] [<c00134e4>] (dump_backtrace) from [<c00136e0>] (show_stack+0x18/0x1c)[ 10.728813] r7:bf00e360 r6:000002cf r5:00000009 r4:00000000[ 10.772889] [<c00136c8>] (show_stack) from [<c02a8688>] (dump_stack+0x24/0x28)[ 10.848796] omap_hwmod: pruss: _wait_target_ready failed: -16[ 10.870385] [<c02a8664>] (dump_stack) from [<c0031d0c>] (warn_slowpath_common+0x88/0xb4)[ 10.878947] [<c0031c84>] (warn_slowpath_common) from [<c0031ddc>] (warn_slowpath_null+0x24/0x2c)[ 10.926904] ti-pruss 4a300000.pruss: couldn't enable pruss[ 10.985765] ti-pruss: probe of 4a300000.pruss failed with error -16[ 11.006706] r8:0000000f[0;32m OK 0m] Found device /dev/ttyO3. r7:bf00f4a4 r6:bf00f494 r5:cf3f6400 r4:cf3f6400[ 11.074527] [<c0031db8>] (warn_slowpath_null) from [<bf00e360>] (spidev_probe+0x1a8/0x1c4 [spidev])[ 11.111780] omap-sham 53100000.sham: hw accel on OMAP rev 4.3[ 11.228701] [<bf00e1b8>] (spidev_probe [spidev]) from [<c0435758>] (spi_drv_probe+0x84/0xb0)[ 11.291737] r8:0000000f r7:bf00f4a4 r6:bf00f494 r5:00000000 r4:cf3f6400[ 11.298898] [<c04356d4>] (spi_drv_probe) from [<c03db7fc>] (driver_probe_device+0x204/0x2f8)[ 11.475716] r7:bf00f4a4 r6:00000000 r5:cf3f6400 r4:c097c088[ 11.497754] [<c03db5f8>] (driver_probe_device) from [<c03db984>] (__driver_attach+0x94/0x98) Starting Network Time Synchronization… Starting Update UTMP about System Boot/Shutdown…[ 11.679188] r9:308d409c r8:cf72bf88 r7:00000000 r6:cf3f6434 r5:bf00f4a4 r4:cf3f6400[ 11.687446] [<c03db8f0>] (__driver_attach) from [<c03d9904>] (bus_for_each_dev+0x70/0xa4)[ 11.889161] r7:00000000 r6:c03db8f0 r5:bf00f4a4 r4:00000000[ 11.895215] [<c03d9894>] (bus_for_each_dev) from [<c03db0e8>] (driver_attach+0x24/0x28)[ 12.026280] r6:c0931ec8 r5:cf771380 r4:bf00f4a4[ 12.144550] [<c03db0c4>] (driver_attach) from [<c03dad24>] (bus_add_driver+0x1a8/0x220)[ 12.244188] [<c03dab7c>] (bus_add_driver) from [<c03dc19c>] (driver_register+0x80/0x100)[ 12.368045] omap-aes 53500000.aes: OMAP AES hw accel rev: 3.2[ 12.377974] r7:cf72b380 r6:bf00f47c r5:bf00f6c0 r4:bf00f4a4[ 12.450510] [<c03dc11c>] (driver_register) from [<c0435694>] (__spi_register_driver+0x60/0x64)[ 12.596548] r5:bf00f6c0 r4:c08feca0[ 12.650648] [<c0435634>] (__spi_register_driver) from [<bf011098>] (spidev_init+0x98/0xd0 [spidev])[0;32m OK 0m] Started Network Time Synchronization.[ 12.784675] [<bf011000>] (spidev_init [spidev]) from [<c00096bc>] (do_one_initcall+0x98/0x1e4)[ 12.942376] r6:c08feca0 r5:bf011000 r4:c08feca0[ 12.947335] [<c0009624>] (do_one_initcall) from [<c00b2e00>] (do_init_module+0x68/0x390)[ 13.120552] remoteproc0: wkup_m3 is available[ 13.125264] remoteproc0: Note: remoteproc is still under development and considered experimental.[ 13.150894] r10:bf00f500 r9:308d409c r8:cf72bf88 r7:00000001 r6:cf72bf40 r5:00000001[ 13.264172] r4:bf00f500[ 13.266933] [<c00b2d98>] (do_init_module) from [<c00936ec>] (load_module+0x1d38/0x1f88)[ 13.355253] remoteproc0: THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.[ 13.408893] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle[ 13.439166] r6:cf72bf80 r5:00000001 r4:cf7cdf44[ 13.444120] [<c00919b4>] (load_module) from [<c0093b28>] (SyS_finit_module+0x88/0x98)[ 13.575480] PM: Cannot get wkup_m3_ipc handle[ 13.605518] remoteproc0: powering up wkup_m3[ 13.628345] r10:00000000[ 13.662580] remoteproc0: Booting fw image am335x-pm-firmware.elf, size 217280[ 13.681772] r9:cf7cc000 r8:c000fbc4 r7:0000017b r6:b6e30d90 r5:00000007[ 13.688890] r4:00000000[ 13.726766] PM: bootloader does not support rtc-only![ 13.812292] remoteproc0: remote processor wkup_m3 is now up[ 13.812329] wkup_m3_ipc 44e11324.wkup_m3_ipc: CM3 Firmware Version = 0x192[ 13.839170][ 13.840833] [<c0093aa0>] (SyS_finit_module) from [<c000fa00>] (ret_fast_syscall+0x0/0x3c)[ 13.930956] r6:00000000 r5:7f5df928 r4:00000000[ 13.935879] —[ end trace f3fc4c1dd27b4946 ]—[0;32m OK 0m] Started Update UTMP about System Boot/Shutdown.[ 14.970619] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some datamay be corrupt. Please run fsck.[0;32m OK 0m] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.[0;32m OK 0m] Reached target System Time Synchronized. Starting Synchronize System and HW clocks…[0;32m OK 0m] Started Synchronize System and HW clocks.[0;32m OK 0m] Reached target System Initialization.[0;32m OK 0m] Listening on D-Bus System Message Bus Socket.[0;32m OK 0m] Started Daily Cleanup of Temporary Directories.[0;32m OK 0m] Reached target Timers.[0;32m OK 0m] Listening on RPCbind Server Activation Socket.[0;32m OK 0m] Reached target Sockets.[0;32m OK 0m] Reached target Basic System. Starting Permit User Sessions…[0;32m OK 0m] Started D-Bus System Message Bus. Starting Network Service… Starting sshd.service…[0;32m OK 0m] Started System Logging Service.[0;32m OK 0m] Started Kernel Logging Service. Starting Login Service… Starting Print notice about GPLv3 packages…[0;32m OK 0m] Started Permit User Sessions.[ 18.650483] usbcore: registered new interface driver usbfs[ 18.656391] usbcore: registered new interface driver hub[ 18.797655] usbcore: registered new device driver usb[ 19.184041] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver[ 19.254022] musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned busnumber 1[ 19.312984] hub 1-0:1.0: USB hub found[ 19.324279] hub 1-0:1.0: 1 port detected[ 19.408259] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver[0;32m OK 0m] Started Network Service.[ 19.499218] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned busnumber 2[ 19.546994] hub 2-0:1.0: USB hub found[ 19.563321] hub 2-0:1.0: 1 port detected[ 19.606017] net eth1: initializing cpsw version 1.12 (0)[ 19.634600] net eth0: initialized cpsw ale version 1.4[ 19.659252] net eth0: ALE Table size 1024[ 19.789517] net eth1: phy found : id is : 0x20005ce1[ 19.822497] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready[ 19.909637] net eth0: initializing cpsw version 1.12 (0)[ 20.029497] net eth0: phy found : id is : 0x20005ce1[ 20.093054] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready[0;32m OK 0m] Started sshd.service.******************************************************************************************************************************NOTICE: This file system contains the following GPLv3 packages: binutils dosfstools m4
If you do not wish to distribute GPLv3 components please removethe above packages prior to distribution. This can be done usingthe opkg remove command. i.e.: opkg remove <package>Where <package> is the name printed in the list above
NOTE: If the package is a dependency of another package you will be notified of the dependent packages. You should use the –force-removal-of-dependent-packages option to also remove the dependent packages as well******************************************************************************************************************************[ 23.040268] cpsw 4a100000.ethernet eth0: Link is Up – 100Mbps/Full – flow control rx/tx[[ 23.069381] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready0;32m OK 0m] Started Print notice about GPLv3 packages.[0;32m OK 0m] Started Login Service. Starting rng-tools.service…[0;32m OK 0m] Reached target Network. Starting Network Name Resolution…[0;32m OK 0m] Started Getty on tty1.[0;32m OK 0m] Started Serial Getty on ttyO0.[0;32m OK 0m] Started Serial Getty on ttyO3.[ 23.532279] random: nonblocking pool is initialized[0;32m OK 0m] Started rng-tools.service.[0;32m OK 0m] Started Network Name Resolution. Starting userconfig.service… Starting thermal-zone-init.service…[0;32m OK 0m] Started thermal-zone-init.service.[0;32m OK 0m] Started userconfig.service. Starting appstart.service…[0;32m OK 0m] Started appstart.service.[ 29.573718] kernel:tty(3) write data len is 2
_____ _____ _ [ 29.588409] kernel:tty(3) write data len is 1 _| _ |___ ___ ___ ___ | _ |___ ___ |_|___ ___| |_| | _| .'| . | . | [ 29.606425] kernel:tty(3) write data len is 1 | __| _| . | | | -_| _| _||__|__|_| |__,|_ |___| |__| |_| |___|_| |___|___|_| [ 29.623517] kernel:tty(3) write data len is 1
|___| |___|
Arago Project http:[ 29.640162] kernel:tty(3) write data len is 1//arago-project.org am335x-evm ttyO0
Arago 2016.10 am335x-evm ttyO0
[ 29.653870] kernel:tty(3) write data len is 1[ 29.663606] kernel:tty(3) write data len is 1[ 29.668585] kernel:tty(3) write data len is 1am335x-evm login: [ 29.679477] kernel:tty(3) write data len is 1[ 29.687859] kernel:tty(3) write data len is 1[ 29.699707] kernel:tty(3) write data len is 1[ 29.705055] kernel:tty(3) write data len is 1[ 29.716529] kernel:tty(3) write data len is 1[ 29.725623] kernel:tty(3) write data len is 1[ 29.734750] kernel:tty(3) write data len is 1[ 29.743731] kernel:tty(3) write data len is 1[ 29.748485] kernel:tty(3) write data len is 1
Zhihua Zhang：
回复 Jian Zhou:
顶一下！
有没有大神能给点指导啊？急！
其余五个串口都正常，就uart3不正常，开始能有几帧数据发送正常，然后再写就return -1了，跟踪了一下驱动代码，返回-1时根本没有进到tty_write函数，有时应用层没有调用write但是驱动层一直在tty_write不停的循环，着到底是哪的问题？
现在可以确定的是硬件肯定没问题，有内核可以在上面正常运行！！！
Zhihua Zhang：
回复 Jian Zhou:
又测了一下，如果我在dts文件里把uart3_rxd配置成为其他脚（原来是spi0_cs1 0x160）后，发送就正常了，一直往外发数据，PC机也能正常接收，是我这个rxd脚用得不对么？原来配置如下：
uart3_pins: pinmux_uart3_pins {pinctrl-single,pins = <0x160 ( PIN_INPUT_PULLUP | MUX_MODE1 ) /* (C15) spi0_cs1.uart3_rxd */0x164 ( PIN_OUTPUT_PULLDOWN | MUX_MODE1 ) /* (C18) eCAP0_in_PWM0_out.uart3_txd */>;};uart3_pins_sleep: pinmux_uart3_pins_sleep {pinctrl-single,pins = <0x160 ( PIN_INPUT_PULLDOWN | MUX_MODE7 ) /* (C15) spi0_cs1.uart3_rxd */0x164 ( PIN_INPUT_PULLDOWN | MUX_MODE7 ) /* (C18) eCAP0_in_PWM0_out.uart3_txd */>;};
Zhihua Zhang：
回复 Jian Zhou:
发现问题了，为什么会同时在ttyO0和ttyO3输出console信息？
_____ _____ _ _ | _ |___ ___ ___ ___ | _ |___ ___ |_|___ ___| |_ | | _| .'| . | . | | __| _| . | | | -_| _| _||__|__|_| |__,|_ |___| |__| |_| |___|_| |___|___|_| |___| |___|
Arago Project http://arago-project.org am335x-evm ttyO3
Arago 2016.10 am335x-evm ttyO3
am335x-evm login:
_____ _____ _ _| _ |___ ___ ___ ___ | _ |___ ___ |_|___ ___| |_| | _| .'| . | . | | __| _| . | | | -_| _| _||__|__|_| |__,|_ |___| |__| |_| |___|_| |___|___|_| |___| |___|
Arago Project http://arago-project.org am335x-evm ttyO0
Arago 2016.10 am335x-evm ttyO0
am335x-evm login:
两个串口同时有！！！
user5215744：
回复 Zhihua Zhang:
你好，我QQ 52551578，遇到同样问题，求交流，大哥
