AM335x UART0 debug problem

I will forward this to the software team.

After replace rootfs from tisdk-rootfs-image-am335x-evm.tar.gz, could not access to command line (could not type any character include "Enter", but could insert any character or key before the last log displayed bellow.


[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Initializing cgroup subsys cpuacct
[ 0.000000] Linux version 4.1.18-gbbe8cfc (linux64@linux64) (gcc version 4.9.3 20150413 (prerelease) (Linaro GCC 4.9-2015.05) ) #46
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Machine model: TI AM335x EVM
[ 0.000000] cma: Reserved 24 MiB at 0x9d800000
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] AM335X ES2.1 (sgx neon )
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 129920
[ 0.000000] Kernel command line: console=ttyS0,115200n8 root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait
[ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.000000] Memory: 484564K/524288K available (6771K kernel code, 278K rwdata, 2272K rodata, 272K init, 235K bss, 15148K reserved,)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
[ 0.000000] vmalloc : 0xe0800000 - 0xff000000 ( 488 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xe0000000 ( 512 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .text : 0xc0008000 - 0xc08dd05c (9045 kB)
[ 0.000000] .init : 0xc08de000 - 0xc0922000 ( 272 kB)
[ 0.000000] .data : 0xc0922000 - 0xc09679c0 ( 279 kB)
[ 0.000000] .bss : 0xc096a000 - 0xc09a4fc8 ( 236 kB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Preemptible hierarchical RCU implementation.
[ 0.000000] Additional per-CPU info printed with stalls.
[ 0.000000] NR_IRQS:16 nr_irqs:16 16
[ 0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
[ 0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[ 0.000030] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000078] clocksource timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000103] OMAP clocksource: timer1 at 24000000 Hz
[ 0.000480] Console: colour dummy device 80x30
[ 0.000549] Calibrating delay loop... 298.59 BogoMIPS (lpj=1492992)
[ 0.067580] pid_max: default: 32768 minimum: 301
[ 0.067835] Security Framework initialized
[ 0.067951] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.067979] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.069512] Initializing cgroup subsys blkio
[ 0.069565] Initializing cgroup subsys memory
[ 0.069657] Initializing cgroup subsys devices
[ 0.069694] Initializing cgroup subsys freezer
[ 0.069728] Initializing cgroup subsys perf_event
[ 0.069792] CPU: Testing write buffer coherency: ok
[ 0.070559] Setting up static identity map for 0x80008200 - 0x80008270
[ 0.074173] devtmpfs: initialized
[ 0.106249] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[ 0.141043] omap_hwmod: debugss: _wait_target_disable failed
[ 0.210932] clocksource jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.215622] pinctrl core: initialized pinctrl subsystem
[ 0.218803] NET: Registered protocol family 16
[ 0.224287] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.247660] cpuidle: using governor ladder
[ 0.277646] cpuidle: using governor menu
[ 0.288932] OMAP GPIO hardware version 0.1
[ 0.311758] omap-gpmc 50000000.gpmc: could not find pctldev for node /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/nandflash_pins_dee
[ 0.319908] No ATAGs?
[ 0.319969] hw-breakpoint: debug architecture 0x4 unsupported.
[ 0.393302] edma 49000000.edma: TI EDMA DMA engine driver
[ 0.404275] vgaarb: loaded
[ 0.406128] SCSI subsystem initialized
[ 0.406941] usbcore: registered new interface driver usbfs
[ 0.407130] usbcore: registered new interface driver hub
[ 0.407411] usbcore: registered new device driver usb
[ 0.408551] omap_i2c 44e0b000.i2c: could not find pctldev for node /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, de
[ 0.408674] omap_i2c 4802a000.i2c: could not find pctldev for node /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c1_pins, de
[ 0.409025] media: Linux media interface: v0.10
[ 0.409198] Linux video capture interface: v2.00
[ 0.409344] pps_core: LinuxPPS API ver. 1 registered
[ 0.409365] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.409443] PTP clock support registered
[ 0.411550] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[ 0.412137] Advanced Linux Sound Architecture Driver Initialized.
[ 0.414254] Switched to clocksource timer1
[ 0.442183] NET: Registered protocol family 2
[ 0.444119] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.444408] TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.444534] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.444714] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.444766] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.445158] NET: Registered protocol family 1
[ 0.445936] RPC: Registered named UNIX socket transport module.
[ 0.445971] RPC: Registered udp transport module.
[ 0.445989] RPC: Registered tcp transport module.
[ 0.446007] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.448011] CPU PMU: Failed to parse /pmu/interrupt-affinity[0]
[ 0.448125] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
[ 0.453256] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.453483] audit: initializing netlink subsys (disabled)
[ 0.453624] audit: type=2000 audit(0.440:1): initialized
[ 0.473283] VFS: Disk quotas dquot_6.6.0
[ 0.473779] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.479444] NFS: Registering the id_resolver key type
[ 0.479587] Key type id_resolver registered
[ 0.479609] Key type id_legacy registered
[ 0.479796] jffs2: version 2.2. (NAND) (SUMMARY) �© 2001-2006 Red Hat, Inc.
[ 0.488464] NET: Registered protocol family 38
[ 0.488616] io scheduler noop registered
[ 0.488649] io scheduler deadline registered
[ 0.488788] io scheduler cfq registered (default)
[ 0.491496] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
[ 0.497869] backlight supply power not found, using dummy regulator
[ 0.501986] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
[ 0.504940] Serial: 8250/16550 driver, 10 ports, IRQ sharing enabled
[ 0.514209] console [ttyS0] disabled
[ 0.514873] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, base_baud = 3000000) is a 8250
[ 1.173453] console [ttyS0] enabled
[ 1.179301] 48022000.serial: ttyS1 at MMIO 0x48022000 (irq = 159, base_baud = 3000000) is a 8250
[ 1.190418] 48024000.serial: ttyS2 at MMIO 0x48024000 (irq = 160, base_baud = 3000000) is a 8250
[ 1.201430] 481a6000.serial: ttyS3 at MMIO 0x481a6000 (irq = 161, base_baud = 3000000) is a 8250
[ 1.212391] 481a8000.serial: ttyS4 at MMIO 0x481a8000 (irq = 162, base_baud = 3000000) is a 8250
[ 1.225469] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20
[ 1.232535] [drm] Initialized drm 1.1.0 20060810
[ 1.238463] panel panel: pins are not configured
[ 1.246316] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.252994] [drm] No driver support for vblank timestamp query.
[ 1.278014] Console: switching to colour frame buffer device 30x40
[ 1.287412] tilcdc 4830e000.lcdc: fb0: frame buffer device
[ 1.293369] tilcdc 4830e000.lcdc: registered panic notifier
[ 1.324331] [drm] Initialized tilcdc 1.0.0 20121205 on minor 0
[ 1.357138] brd: module loaded
[ 1.373473] loop: module loaded
[ 1.380128] mtdoops: mtd device (mtddev=name/number) must be supplied
[ 1.394867] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.401478] ehci-pci: EHCI PCI platform driver
[ 1.406312] ehci-platform: EHCI generic platform driver
[ 1.412149] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 1.418508] ohci-pci: OHCI PCI platform driver
[ 1.423528] usbcore: registered new interface driver cdc_wdm
[ 1.429441] usbcore: registered new interface driver uas
[ 1.435109] usbcore: registered new interface driver usb-storage
[ 1.441292] usbcore: registered new interface driver ums_eneub6250
[ 1.447690] usbcore: registered new interface driver ums-freecom
[ 1.453917] usbcore: registered new interface driver ums-sddr55
[ 1.461150] mousedev: PS/2 mouse device common for all mice
[ 1.466996] i2c /dev entries driver
[ 1.472276] sdhci: Secure Digital Host Controller Interface driver
[ 1.478721] sdhci: Copyright(c) Pierre Ossman
[ 1.485071] omap_hsmmc 48060000.mmc: Got CD GPIO
[ 1.639168] usbcore: registered new interface driver ushc
[ 1.645099] ledtrig-cpu: registered to indicate activity on CPUs
[ 1.653053] remoteproc0: wkup_m3 is available
[ 1.657905] remoteproc0: Note: remoteproc is still under development and considered experimental.
[ 1.668132] remoteproc0: THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.
[ 1.678951] remoteproc0: Direct firmware load for am335x-pm-firmware.elf failed with error -2
[ 1.691605] pinctrl-single 44e10800.pinmux: pin 44e1090c.0 already requested by 48024000.serial; cannot claim for 4803c000.mcasp
[ 1.703575] remoteproc0: Falling back to user helper
[ 1.709155] pinctrl-single 44e10800.pinmux: pin-67 (4803c000.mcasp) status -22
[ 1.716598] pinctrl-single 44e10800.pinmux: could not request pin 67 (44e1090c.0) from group am335x_evm_audio_pins on device pince
[ 1.729376] davinci-mcasp 4803c000.mcasp: Error applying setting, reverse things back
[ 1.739765] oprofile: using arm/armv7
[ 1.744479] Initializing XFRM netlink socket
[ 1.748884] NET: Registered protocol family 17
[ 1.753450] NET: Registered protocol family 15
[ 1.758348] Key type dns_resolver registered
[ 1.763405] omap_voltage_late_init: Voltage driver support not added
[ 1.770922] cpu cpu0: of_pm_voltdm_notifier_register: Failed to get cpu0 regulator/voltdm: -517
[ 1.779890] cpu cpu0: cpu0 clock notifier not ready, retry
[ 1.786403] ThumbEE CPU extension supported.
[ 1.790772] Registering SWP/SWPB emulation handler
[ 1.801466] omap-gpmc 50000000.gpmc: GPMC revision 6.0
[ 1.806978] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
[ 1.816449] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda
[ 1.822855] nand: Micron MT29F2G08ABAEAWP
[ 1.827108] nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
[ 1.834919] nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme
[ 1.840506] 10 ofpart partitions found on MTD device 8000000.nand
[ 1.846766] Creating 10 MTD partitions on "8000000.nand":
[ 1.852226] 0x000000000000-0x000000020000 : "NAND.SPL"
[ 1.860387] 0x000000020000-0x000000040000 : "NAND.SPL.backup1"
[ 1.868829] 0x000000040000-0x000000060000 : "NAND.SPL.backup2"
[ 1.877309] 0x000000060000-0x000000080000 : "NAND.SPL.backup3"
[ 1.885729] 0x000000080000-0x0000000c0000 : "NAND.u-boot-spl-os"
[ 1.894125] 0x0000000c0000-0x0000001c0000 : "NAND.u-boot"
[ 1.902413] 0x0000001c0000-0x0000001e0000 : "NAND.u-boot-env"
[ 1.910595] 0x0000001e0000-0x000000200000 : "NAND.u-boot-env.backup1"
[ 1.919585] 0x000000200000-0x000000a00000 : "NAND.kernel"
[ 1.930777] 0x000000a00000-0x000010000000 : "NAND.file-system"
[ 2.067360] tps65217 0-0024: TPS65217 ID 0xe version 1.2
[ 2.072814] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[ 2.082292] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz
[ 2.090721] omap_hsmmc 48060000.mmc: Got CD GPIO
[ 2.139144] cpu cpu0: of_pm_voltdm_notifier_register: Fail calculating voltage latency[950000<->1260000]:-22
[ 2.150229] cpu cpu0: of_pm_voltdm_notifier_register: Fail calculating voltage latency[950000<->1260000]:-22
[ 2.167304] hctosys: unable to open rtc device (rtc0)
[ 2.176742] wlan-en-regulator: disabling
[ 2.180715] lis3_reg: disabling
[ 2.183965] vbat: disabling
[ 2.187009] ALSA device list:
[ 2.190035] No soundcards found.
[ 2.194889] Waiting for root device /dev/mmcblk0p2...
[ 2.213128] mmc1: host does not support reading read-only switch, assuming write-enable
[ 2.224476] mmc1: new high speed SDHC card at address aaaa
[ 2.230726] mmcblk0: mmc1:aaaa SL08G 7.40 GiB
[ 2.236976] mmcblk0: p1 p2
[ 2.319471] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 2.327890] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[ 2.338291] devtmpfs: mounted
[ 2.341815] Freeing unused kernel memory: 272K (c08de000 - c0922000)
INIT: version 2.88 booting
Starting udev
cmp: EOF on /etc/udev/cache.data
udev: Not using udev cache because of changes detected in the following files:
udev: /proc/version /proc/cmdline /proc/devices
udev: lib/udev/rules.d/* etc/udev/rules.d/*
udev: The udev cache will be regenerated. To identify the detected changes,
udev: compare the cached sysconf at /etc/udev/cache.data
udev: against the current sysconf at /dev/shm/udev.cache
[ 3.167928] udevd[94]: starting version 182
[ 4.813885] remoteproc0: powering up wkup_m3
[ 4.852694] remoteproc0: Booting fw image am335x-pm-firmware.elf, size 219803
[ 4.972170] remoteproc0: remote processor wkup_m3 is now up
[ 4.977921] wkup_m3_ipc 44e11324.wkup_m3_ipc: CM3 Firmware Version = 0x191
[ 7.645527] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 8.003643] EXT4-fs (mmcblk0p2): warning: mounting fs with errors, running e2fsck is recommended
[ 8.015885] EXT4-fs (mmcblk0p2): re-mounted. Opts: data=ordered
bootlogd: cannot allocate pseudo tty: No such file or directory
[ 8.153443] random: dd urandom read with 54 bits of entropy available
Populating dev cache
ALSA: Restoring mixer settings...
/usr/sbin/alsactl: load_state:1729: No soundcards found...
hwclock: can't open '/dev/misc/rtc': No such file or directory
Fri Jan 8 23:20:04 UTC 2016
hwclock: can't open '/dev/misc/rtc': No such file or directory
INIT: Entering runlevel: 5
Configuring network interfaces... ifconfig: SIOCGIFFLAGS: No such device
done.
Starting system message bus: dbus.
Starting telnet daemon.
Starting rpcbind daemon...rpcbind: cannot create socket for udp6
rpcbind: cannot create socket for tcp6
done.
starting statd: done
hwclock: can't open '/dev/misc/rtc': No such file or directory
Starting syslogd/klogd: done
Starting thttpd.
Enabling thermal zones...
/etc/rc5.d/S98thermal-zone-init: line 7: /sys/class/thermal/thermal_zone*/mode: No such file or directory

_____ _____ _ _
| _ |___ ___ ___ ___ | _ |___ ___ |_|___ ___| |_
| | _| .'| . | . | | __| _| . | | | -_| _| _|
|__|__|_| |__,|_ |___| |__| |_| |___|_| |___|___|_|
|___| |___|

Arago Project http://arago-project.org am335x-evm /dev/ttyS0

Arago 2015.12 am335x-evm /dev/ttyS0

am335x-evm login:

In kernel , I try to print info with printk in timer callback function, in a simple driver I added.
It could display info. before the last kernel log. After that, the debug port display nothing.

Hi, Kemal,

Thanks for your reply.

For debug port, I modified the inittab refer to .  The root file system could boot up with other version kernel linux 3.2.0 and 3.12.0, which I got from TI's SDK.

Best Regards

Lield

Hi, Kemal

      How about this loopback?

Thanks