AM335x EVM missing UART1-UART5 using SDK7

Hi,

Have you added the missing UARTS to your device tree?

Hi Biser,

Thank you for your reply. I added the code below to the am335x-evmsk.dts file under the am33xx_pinmux function, compiled to get am335x-evmsk.dtb, and copied it into SD card: rootfs/boot/. I now see /dev/ttyO1 and /dev/ttyO4. I'm currently unable to see my devices still. However, have I done this correctly?

Thanks,

Tom

am33xx_pinmux: pinmux@44e10800 {

...

  /* NCD - DEBUG */
  uart1_pins: pinmux_uart1_pins {
    pinctrl-single,pins = < 
    0x178 (PIN_INPUT | MUX_MODE0) /* uart1_ctsn.uart1_ctsn */
    0x17C (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* uart1_rtsn.uart1_rtsn */
    0x180 (PIN_INPUT_PULLUP | MUX_MODE0) /* uart1_rxd.uart1_rxd */
    0x184 (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* uart1_txd.uart1_txd */
    >;
  };

  /* NCD - DEBUG TX: 0x074 0x06, RX: 0x070 0x26 */
  uart4_pins: pinmux_uart4_pins {
    pinctrl-single,pins = <
    0x068 (PIN_INPUT | MUX_MODE0) /* uart4_ctsn.uart4_ctsn */
    0x06C (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* uart4_rtsn.uart4_rtsn */
    0x070 (PIN_INPUT_PULLUP | MUX_MODE0) /* uart4_rxd.uart4_rxd */
    0x074 (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* uart4_txd.uart4_txd */
    >;
  };

  ...

  ocp {
    uart0: serial@44e09000 {
      pinctrl-names = "default";
      pinctrl-0 = <&uart0_pins>;

      status = "okay";
    };

    /* NCD DEBUG /dev/ttyO1 */
    uart1: serial@48022000 {
      pinctrl-names = "default";
      pinctrl-0 = <&uart1_pins>;

      status = "okay";
    };

    /* NCD DEBUG /dev/ttyO4 */
    uart4: serial@481a8000 {
      pinctrl-names = "default";
      pinctrl-0 = <&uart4_pins>;

      status = "okay";
    };

...

  }

...

}

Hi,

looks like your Pin Mux are not set correctly for UART1/4 pins.
Try to follow these steps to resolve the issue:
blog.pignology.net/.../getting-uart2-devttyo1-working-on.html

BR,
Georgi

Thanks for the pointer, Georgi. From your link, I found this: blog.pignology.net/.../getting-uart2-devttyo1-working-on.html , which seems to walk me through what I need to do. However, once it got to this line:

export SLOTS=/sys/devices/bone_capemgr.9/slots

I get stuck again because the EVM SK does not have a bone_capemgr.x I do have uart2pinmux-00A0.dtbo in /lib/firmware. Do you know what to do next?

Thanks,

Tom

Hi Tom,

if you are able to see added uarts in /dev/ttyOx, but cannot use them, try to verify if addresses of added uarts in pinmux_uartX_pins do not conflict with other addreses in dts files you edited.

Also can you share your Starting kernel log?

BR,
Georgi

Hi Georgi,

I have since tried downloading the latest SDK, but the problem is the same. Interestingly, the new default am335x-evmsk.dts file no longer has an ocp function. I wonder if that has anything to do with this line:

[ 1.198337] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/serial@48022000[0]'

I do not see any other instances of the addresses that I added in pinmux_uart1_pins in the .dts file, namely 0x180 and 0x184. Are these what you were referring to?

I apologize if all of my questions are very basic. As you can tell, I'm very new and I'm just trying to get *something* to work!

Thanks,

Tom

Here is my kernel log:

[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 3.14.26-gb9df364-dirty (sysadmin@sitara) (gcc version 4.7.3 20130226 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.03-20130313 - Linaro GCC 2013.03) ) #2 Mon May 25 19:33:12 PDT 2015
[ 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-SK
[ 0.000000] cma: CMA: reserved 24 MiB at 8d800000
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] On node 0 totalpages: 65024
[ 0.000000] free_area_init_node: node 0, pgdat c084cd24, node_mem_map cfbee000
[ 0.000000] Normal zone: 512 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 65024 pages, LIFO batch:15
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] AM335X ES1.0 (sgx neon )
[ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 64512
[ 0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait
[ 0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
[ 0.000000] Memory: 224344K/260096K available (5791K kernel code, 313K rwdata, 2088K rodata, 269K init, 231K bss, 35752K reserved, 0K highmem)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
[ 0.000000] vmalloc : 0xd0800000 - 0xff000000 ( 744 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xd0000000 ( 256 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .text : 0xc0008000 - 0xc07ba054 (7881 kB)
[ 0.000000] .init : 0xc07bb000 - 0xc07fe454 ( 270 kB)
[ 0.000000] .data : 0xc0800000 - 0xc084e760 ( 314 kB)
[ 0.000000] .bss : 0xc084e760 - 0xc0888738 ( 232 kB)
[ 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] Total of 128 interrupts on 1 active controller
[ 0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[ 0.000015] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956969942ns
[ 0.000038] OMAP clocksource: timer1 at 24000000 Hz
[ 0.000320] Console: colour dummy device 80x30
[ 0.000352] Calibrating delay loop... 718.02 BogoMIPS (lpj=3590144)
[ 0.119365] pid_max: default: 32768 minimum: 301
[ 0.119468] Security Framework initialized
[ 0.119526] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.119539] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.127608] CPU: Testing write buffer coherency: ok
[ 0.128017] Setting up static identity map for 0x805ad920 - 0x805ad978
[ 0.129036] devtmpfs: initialized
[ 0.131028] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[ 0.138885] omap_hwmod: tptc0 using broken dt data from edma
[ 0.138974] omap_hwmod: tptc1 using broken dt data from edma
[ 0.139054] omap_hwmod: tptc2 using broken dt data from edma
[ 0.143433] omap_hwmod: debugss: _wait_target_disable failed
[ 0.199601] pinctrl core: initialized pinctrl subsystem
[ 0.200713] regulator-dummy: no parameters
[ 0.203205] NET: Registered protocol family 16
[ 0.205418] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.208204] cpuidle: using governor ladder
[ 0.208222] cpuidle: using governor menu
[ 0.215627] syscon 44e10000.control_module: regmap [mem 0x44e10000-0x44e107fb] registered
[ 0.217255] platform 49000000.edma: alias fck already exists
[ 0.217282] platform 49000000.edma: alias fck already exists
[ 0.217298] platform 49000000.edma: alias fck already exists
[ 0.218246] gpiochip_add: registered GPIOs 0 to 31 on device: gpio
[ 0.218558] OMAP GPIO hardware version 0.1
[ 0.219587] gpiochip_add: registered GPIOs 32 to 63 on device: gpio
[ 0.220725] gpiochip_add: registered GPIOs 64 to 95 on device: gpio
[ 0.221841] gpiochip_add: registered GPIOs 96 to 127 on device: gpio
[ 0.234745] No ATAGs?
[ 0.234772] hw-breakpoint: debug architecture 0x4 unsupported.
[ 0.262952] bio: create slab <bio-0> at 0
[ 0.280262] edma-dma-engine edma-dma-engine.0: TI EDMA DMA engine driver
[ 0.281049] of_get_named_gpiod_flags: can't parse gpios property of node '/fixedregulator@0[0]'
[ 0.281398] vbat: 5000 mV
[ 0.281531] of_get_named_gpiod_flags: can't parse gpios property of node '/fixedregulator@1[0]'
[ 0.281817] lis3_reg: no parameters
[ 0.281933] reg-fixed-voltage fixedregulator.6: could not find pctldev for node /pinmux@44e10800/pinmux_wl12xx_gpio, deferring probe
[ 0.281958] platform fixedregulator.6: Driver reg-fixed-voltage requests probe deferral
[ 0.282054] of_get_named_gpiod_flags exited with status 0
[ 0.282438] vtt: 1500 mV
[ 0.285859] vgaarb: loaded
[ 0.286440] i2c-core: driver [palmas] using legacy suspend method
[ 0.286452] i2c-core: driver [palmas] using legacy resume method
[ 0.287256] SCSI subsystem initialized
[ 0.287837] libata version 3.00 loaded.
[ 0.288866] usbcore: registered new interface driver usbfs
[ 0.289066] usbcore: registered new interface driver hub
[ 0.289284] usbcore: registered new device driver usb
[ 0.290410] omap_i2c 44e0b000.i2c: could not find pctldev for node /pinmux@44e10800/pinmux_i2c0_pins, deferring probe
[ 0.290441] platform 44e0b000.i2c: Driver omap_i2c requests probe deferral
[ 0.290868] pps_core: LinuxPPS API ver. 1 registered
[ 0.290879] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.291018] PTP clock support registered
[ 0.293173] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[ 0.294123] Advanced Linux Sound Architecture Driver Initialized.
[ 0.295832] Switched to clocksource timer1
[ 0.317192] NET: Registered protocol family 2
[ 0.318123] TCP established hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.318161] TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.318192] TCP: Hash tables configured (established 2048 bind 2048)
[ 0.318266] TCP: reno registered
[ 0.318281] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.318302] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.318506] NET: Registered protocol family 1
[ 0.318915] RPC: Registered named UNIX socket transport module.
[ 0.318927] RPC: Registered udp transport module.
[ 0.318934] RPC: Registered tcp transport module.
[ 0.318941] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.318958] PCI: CLS 0 bytes, default 64
[ 0.320097] hw perfevents: enabled with ARMv7 Cortex-A8 PMU driver, 5 counters available
[ 0.323089] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.509272] VFS: Disk quotas dquot_6.5.2
[ 0.509340] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.509892] NFS: Registering the id_resolver key type
[ 0.509978] Key type id_resolver registered
[ 0.509987] Key type id_legacy registered
[ 0.510029] jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
[ 0.510218] msgmni has been set to 486
[ 0.511779] NET: Registered protocol family 38
[ 0.511822] io scheduler noop registered
[ 0.511831] io scheduler deadline registered
[ 0.511853] io scheduler cfq registered (default)
[ 0.513777] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
[ 0.517571] of_get_named_gpiod_flags: can't parse gpios property of node '/backlight[0]'
[ 0.517609] backlight.10 supply power not found, using dummy regulator
[ 0.521470] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 0.524823] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/serial@44e09000[0]'
[ 0.524869] omap_uart 44e09000.serial: no wakeirq for uart0
[ 0.524884] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/serial@44e09000[0]'
[ 0.525045] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0
[ 1.193960] console [ttyO0] enabled
[ 1.198337] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/serial@48022000[0]'
[ 1.198368] omap_uart 48022000.serial: no wakeirq for uart0
[ 1.204187] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/serial@48022000[0]'
[ 1.204393] 48022000.serial: ttyO1 at MMIO 0x48022000 (irq = 89, base_baud = 3000000) is a OMAP UART1
[ 1.215555] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20
[ 1.222974] [drm] Initialized drm 1.1.0 20060810
[ 1.239576] brd: module loaded
[ 1.248885] loop: module loaded
[ 1.252593] (hci_tty): inside hci_tty_init
[ 1.257443] (hci_tty): allocated 249, 0
[ 1.265616] mtdoops: mtd device (mtddev=name/number) must be supplied
[ 1.276647] usbcore: registered new interface driver asix
[ 1.282524] usbcore: registered new interface driver ax88179_178a
[ 1.289083] usbcore: registered new interface driver cdc_ether
[ 1.295406] usbcore: registered new interface driver smsc95xx
[ 1.301575] usbcore: registered new interface driver net1080
[ 1.307684] usbcore: registered new interface driver cdc_subset
[ 1.314052] usbcore: registered new interface driver zaurus
[ 1.320105] usbcore: registered new interface driver cdc_ncm
[ 1.326592] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.333409] ehci-pci: EHCI PCI platform driver
[ 1.338296] ehci-omap: OMAP-EHCI Host Controller driver
[ 1.344249] usbcore: registered new interface driver cdc_wdm
[ 1.350410] usbcore: registered new interface driver usb-storage
[ 1.357880] mousedev: PS/2 mouse device common for all mice
[ 1.365080] TI-am335x-tsc TI-am335x-tsc: ti,charge-delay not specified
[ 1.372492] input: ti-tsc as /devices/ocp.3/44e0d000.tscadc/TI-am335x-tsc/input/input0
[ 1.382383] i2c-core: driver [rtc-ds1307] using legacy suspend method
[ 1.389159] i2c-core: driver [rtc-ds1307] using legacy resume method
[ 1.396636] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as rtc0
[ 1.404034] 44e3e000.rtc: already running
[ 1.409147] i2c /dev entries driver
[ 1.412963] Driver for 1-wire Dallas network protocol.
[ 1.420781] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[ 1.429591] of_get_named_gpiod_flags exited with status 0
[ 1.429611] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@48060000[0]'
[ 1.430110] omap_hsmmc 48060000.mmc: unable to get vmmc regulator -517
[ 1.437215] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral
[ 1.444683] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@481d8000[0]'
[ 1.444695] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@481d8000[0]'
[ 1.444925] omap_hsmmc 481d8000.mmc: unable to get vmmc regulator -517
[ 1.451847] platform 481d8000.mmc: Driver omap_hsmmc requests probe deferral
[ 1.459862] of_get_named_gpiod_flags exited with status 0
[ 1.459883] of_get_named_gpiod_flags exited with status 0
[ 1.459895] of_get_named_gpiod_flags exited with status 0
[ 1.459906] of_get_named_gpiod_flags exited with status 0
[ 1.459920] of_get_named_gpiod_flags exited with status 0
[ 1.460363] of_get_named_gpiod_flags exited with status 0
[ 1.460680] of_get_named_gpiod_flags exited with status 0
[ 1.460949] of_get_named_gpiod_flags exited with status 0
[ 1.461557] ledtrig-cpu: registered to indicate activity on CPUs
[ 1.468240] omap-aes 53500000.aes: OMAP AES hw accel rev: 3.2
[ 1.475586] omap-sham 53100000.sham: hw accel on OMAP rev 4.3
[ 1.483283] usbcore: registered new interface driver usbhid
[ 1.489141] usbhid: USB HID core driver
[ 1.493438] platform 44d00000.wkup_m3: Driver wkup_m3 requests probe deferral
[ 1.504287] oprofile: using arm/armv7
[ 1.508537] TCP: cubic registered
[ 1.511999] Initializing XFRM netlink socket
[ 1.516502] NET: Registered protocol family 17
[ 1.521181] NET: Registered protocol family 15
[ 1.525964] Key type dns_resolver registered
[ 1.531153] cpu cpu0: of_pm_voltdm_notifier_register: Failed to get cpu0 regulator/voltdm: -517
[ 1.540293] cpu cpu0: cpu0 clock notifier not ready, retry
[ 1.546130] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe deferral
[ 1.554544] PM: bootloader does not support rtc-only!
[ 1.559950] ThumbEE CPU extension supported.
[ 1.564441] Registering SWP/SWPB emulation handler
[ 1.571086] lis3_reg: disabling
[ 1.574376] vbat: disabling
[ 1.577411] regulator-dummy: disabling
[ 1.584902] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.591882] [drm] No driver support for vblank timestamp query.
[ 1.648356] Console: switching to colour frame buffer device 60x34
[ 1.657190] tilcdc 4830e000.lcdc: fb0: frame buffer device
[ 1.663007] tilcdc 4830e000.lcdc: registered panic notifier
[ 1.668854] [drm] Initialized tilcdc 1.0.0 20121205 on minor 0
[ 1.675699] of_get_named_gpiod_flags exited with status 0
[ 1.676256] vwl1271: 1800 mV
[ 1.681524] tps65910 0-002d: No interrupt support, no core IRQ
[ 1.692225] vrtc: 1800 mV
[ 1.695349] vrtc: supplied by vbat
[ 1.700726] vio: at 1500 mV
[ 1.703822] vio: supplied by vbat
[ 1.709194] vdd_mpu: 912 <--> 1375 mV at 1137 mV
[ 1.714186] vdd_mpu: supplied by vbat
[ 1.719905] vdd_core: 912 <--> 1150 mV at 1137 mV
[ 1.724983] vdd_core: supplied by vbat
[ 1.730424] vdd3: 5000 mV
[ 1.734675] vdig1: at 1800 mV
[ 1.737977] vdig1: supplied by vbat
[ 1.743055] vdig2: at 1800 mV
[ 1.746338] vdig2: supplied by vbat
[ 1.751404] vpll: at 1800 mV
[ 1.754593] vpll: supplied by vbat
[ 1.759556] vdac: at 1800 mV
[ 1.762731] vdac: supplied by vbat
[ 1.767761] vaux1: at 1800 mV
[ 1.771034] vaux1: supplied by vbat
[ 1.776115] vaux2: at 3300 mV
[ 1.779379] vaux2: supplied by vbat
[ 1.784462] vaux33: at 3300 mV
[ 1.787850] vaux33: supplied by vbat
[ 1.792994] vmmc: 1800 <--> 3300 mV at 3300 mV
[ 1.797881] vmmc: supplied by vbat
[ 1.803390] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[ 1.809897] of_get_named_gpiod_flags exited with status 0
[ 1.809917] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@48060000[0]'
[ 1.846336] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@481d8000[0]'
[ 1.846359] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/mmc@481d8000[0]'
[ 1.925011] mmc0: host does not support reading read-only switch. assuming write-enable.
[ 1.936525] mmc0: new high speed SDHC card at address e624
[ 1.942962] mmcblk0: mmc0:e624 SU08G 7.40 GiB
[ 1.951266] mmcblk0: p1 p2
[ 1.966607] remoteproc0: wkup_m3 is available
[ 1.971256] remoteproc0: Note: remoteproc is still under development and considered experimental.
[ 1.980656] remoteproc0: THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.
[ 1.991683] remoteproc0: Direct firmware load failed with error -2
[ 1.998305] remoteproc0: Falling back to user helper
[ 2.004074] cpu cpu0: of_pm_voltdm_notifier_register: Fail calculating voltage latency[1100000<->1260000]:-22
[ 2.075875] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
[ 2.082256] davinci_mdio 4a101000.mdio: detected phy mask fffffffe
[ 2.089608] libphy: 4a101000.mdio: probed
[ 2.093806] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver Atheros 8031 ethernet
[ 2.104405] cpsw 4a100000.ethernet: Detected MACID = 6c:ec:eb:b8:e3:e6
[ 2.112645] cpsw 4a100000.ethernet: cpsw: Detected MACID = 6c:ec:eb:b8:e3:e7
[ 2.121579] of_get_named_gpiod_flags exited with status 0
[ 2.121609] of_get_named_gpiod_flags exited with status 0
[ 2.121625] of_get_named_gpiod_flags exited with status 0
[ 2.121638] of_get_named_gpiod_flags exited with status 0
[ 2.122521] input: gpio_buttons.9 as /devices/gpio_buttons.9/input/input1
[ 2.130524] omap_rtc 44e3e000.rtc: setting system clock to 2014-03-31 05:17:40 UTC (1396243060)
[ 2.142993] ALSA device list:
[ 2.146176] No soundcards found.
[ 2.153007] EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem
[ 2.160724] EXT4-fs (mmcblk0p2): write access will be enabled during recovery
[ 9.585605] EXT4-fs (mmcblk0p2): recovery complete
[ 10.002687] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 10.011378] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[ 10.029290] devtmpfs: mounted
[ 10.033661] Freeing unused kernel memory: 268K (c07bb000 - c07fe000)
>[ 10.753301] udevd[851]: starting version 182
[ 11.075173] random: nonblocking pool is initialized
[ 11.081421] remoteproc0: failed to load am335x-pm-firmware.elf
[ 11.087780] remoteproc0: powering up wkup_m3
[ 11.092443] remoteproc0: Direct firmware load failed with error -2
[ 11.099068] remoteproc0: Falling back to user helper
[ 11.269348] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/i2c@44e0b000/tlv320aic3106@1b[0]'
[ 11.316054] lis3lv02d: unknown sensor type 0x87
[ 11.320924] lis3lv02d_i2c: probe of 0-0018 failed with error -22
[ 11.435593] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/usb@47400000/usb-phy@47401300[0]'
[ 11.435694] 47401300.usb-phy supply vcc not found, using dummy regulator
[ 11.517625] of_get_named_gpiod_flags: can't parse gpios property of node '/ocp/usb@47400000/usb-phy@47401b00[0]'
[ 11.517722] 47401b00.usb-phy supply vcc not found, using dummy regulator
[ 12.440670] davinci_evm sound.11: tlv320aic3x-hifi <-> 4803c000.mcasp mapping ok
[ 14.122654] remoteproc0: request_firmware failed: -2
[ 14.128035] wkup_m3 44d00000.wkup_m3: rproc_boot failed
[ 14.147579] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 14.270132] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
[ 14.270160] musb-hdrc: MHDRC RTL version 2.0
[ 14.270170] musb-hdrc: setup fifo_mode 4
[ 14.270191] musb-hdrc: 28/31 max ep, 16384/16384 memory
[ 14.270320] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver
[ 14.353552] musb-hdrc musb-hdrc.0.auto: new USB bus registered, assigned bus number 1
[ 14.414639] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 14.421844] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 14.429394] usb usb1: Product: MUSB HDRC host driver
[ 14.434572] usb usb1: Manufacturer: Linux 3.14.26-gb9df364-dirty musb-hcd
[ 14.441676] usb usb1: SerialNumber: musb-hdrc.0.auto
[ 14.517674] hub 1-0:1.0: USB hub found
[ 14.527330] hub 1-0:1.0: 1 port detected
[ 14.559858] musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
[ 14.559884] musb-hdrc: MHDRC RTL version 2.0
[ 14.559895] musb-hdrc: setup fifo_mode 4
[ 14.559912] musb-hdrc: 28/31 max ep, 16384/16384 memory
[ 14.560061] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[ 14.584166] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 2
[ 14.609536] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[ 14.616729] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 14.624263] usb usb2: Product: MUSB HDRC host driver
[ 14.629456] usb usb2: Manufacturer: Linux 3.14.26-gb9df364-dirty musb-hcd
[ 14.636566] usb usb2: SerialNumber: musb-hdrc.1.auto
[ 14.649952] hub 2-0:1.0: USB hub found
[ 14.662713] hub 2-0:1.0: 1 port detected
[ 14.819582] musb-hdrc musb-hdrc.1.auto: VBUS_ERROR in a_wait_vrise (89, <AValid), retry #1, port1 00000104
[ 14.887400] EXT4-fs (mmcblk0p2): re-mounted. Opts: data=ordered
[ 14.972013] musb-hdrc musb-hdrc.1.auto: VBUS_ERROR in a_wait_vrise (89, <AValid), retry #2, port1 00000104
[ 15.124444] musb-hdrc musb-hdrc.1.auto: VBUS_ERROR in a_wait_vrise (89, <AValid), retry #3, port1 00000104
[ 15.276865] musb-hdrc musb-hdrc.1.auto: VBUS_ERROR in a_wait_vrise (88, <AValid), retry #3, port1 0008010c
[ 15.696508] net eth0: initializing cpsw version 1.12 (0)
[ 15.776627] net eth0: phy found : id is : 0x4dd074
[ 18.776676] libphy: 4a101000.mdio:00 - Link is Up - 100/Full
[ 25.203333] udc musb-hdrc.0.auto: registering UDC driver [g_mass_storage]
[ 25.203417] Number of LUNs=8
[ 25.215938] Mass Storage Function, version: 2009/09/11
[ 25.226224] LUN: removable file: (no medium)
[ 25.236118] Number of LUNs=1
[ 25.246358] lun0: open backing file: /dev/mmcblk0p1
[ 25.246386] LUN: file: /dev/mmcblk0p1
[ 25.250263] Number of LUNs=1
[ 25.253283] g_mass_storage gadget: adding config #1 'Linux File-Backed Storage'/bf0903ac
[ 25.262325] g_mass_storage gadget: I/O thread pid: 1418
[ 25.262351] g_mass_storage gadget: adding 'Mass Storage Function'/cd5feb00 to config 'Linux File-Backed Storage'/bf0903ac
[ 25.262385] g_mass_storage gadget: cfg 1/bf0903ac speeds: high full
[ 25.262396] g_mass_storage gadget: interface 0 = Mass Storage Function/cd5feb00
[ 25.262420] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
[ 25.269778] g_mass_storage gadget: userspace failed to provide iSerialNumber
[ 25.277160] g_mass_storage gadget: g_mass_storage ready
[ 25.809944] g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage
[ 25.817901] g_mass_storage gadget: set_config: interface 0 (Mass Storage Function) requested delayed status
[ 25.817912] g_mass_storage gadget: delayed_status count 1
[ 25.818055] g_mass_storage gadget: usb_composite_setup_continue
[ 25.818069] g_mass_storage gadget: usb_composite_setup_continue: Completing delayed status
[ 26.818108] g_mass_storage gadget: sending command-failure status
[ 26.820557] g_mass_storage gadget: bulk-in set halt
[ 26.926617] g_mass_storage gadget: bulk-in set halt
[ 26.929043] g_mass_storage gadget: bulk-in set halt
[ 27.036502] g_mass_storage gadget: bulk-in set halt
[ 27.139468] g_mass_storage gadget: bulk-in set halt
[ 27.140432] g_mass_storage gadget: bulk-in set halt
[ 27.246621] g_mass_storage gadget: INQUIRY is buggy! Expected length 6 but we got 12
[ 27.247228] g_mass_storage gadget: bulk-in set halt
[ 27.247259] g_mass_storage gadget: sending command-failure status
[ 27.465412] g_mass_storage gadget: bulk-in set halt
[ 27.465489] g_mass_storage gadget: sending command-failure status

So I hooked the UART1 ports to another computer and saw why my test was not working -- I can send messages to the ?EVM-SK via /dev/ttyO1, but I cannot receive messages from the EVM-SK.

However, I successfully conducted a loopback test using code from here: groups.google.com/forum

The loopback test fails (times out) with UART4 (/dev/ttyO4).

At this point, I'm not 100% sure I've got UART1 configured correctly, but given that I can at least see data in one direction, I would think that it is. I may have a hardware issue...

Update: I've confirmed UART1 (/dev/ttyO1) is functional. Still working on UART4...

Taking a look at the pinmux, I indeed have UART4 set incorrectly. This is the new setting in am335x-evmsk.dts

&am33xx_pinmux {
...
/* DEBUG NCD */
uart4_pins: pinmux_uart4_pins {
pinctrl-single,pins = <
0x070 (PIN_INPUT_PULLUP | MUX_MODE6) /* rx */
0x074 (PIN_OUTPUT_PULLDOWN | MUX_MODE6) /* tx */
>;
};
...
};

&uart4 {
pinctrl-names = "default";
pinctrl-0 = <&uart4_pins>;
status = "okay";
};

Still, /dev/ttyO4 does not pass the loopback test.

So close... I'm getting this in my boot log, but I'm not quite sure how to resolve it:

[ 1.214982] pinctrl-single 44e10800.pinmux: pin 44e10870.0 already requested by 44e10800.pinmux; cannot claim for 481a8000.serial
[ 1.227187] pinctrl-single 44e10800.pinmux: pin-28 (481a8000.serial) status -22
[ 1.234818] pinctrl-single 44e10800.pinmux: could not request pin 28 (44e10870.0) from group pinmux_uart4_pins on device pinctrl-single

The following is found in am33xx_pinmux.dtsi:

am33xx_pinmux: pinmux@44e10800 {
compatible = "pinctrl-single";
reg = <0x44e10800 0x0238>;
#address-cells = <1>;
#size-cells = <0>;
pinctrl-single,register-width = <32>;
pinctrl-single,function-mask = <0x7f>;

};

I finally got UART4 working. I found the offending conflicts for 0x70 and 0x74 and commented them out. I don't think I needed them...

Thanks again for your help, Georgi and Biser! Nothing like learning by jumping off the deep end!

In am335x_evmsk.dts:

&am33xx_pinmux {
/*pinctrl-0 = <&gpio_keys_s0 &clkout2_pin &ddr3_vtt_toggle>;*/
pinctrl-0 = <&clkout2_pin &ddr3_vtt_toggle>;

...

/*
gpio_keys_s0: gpio_keys_s0 {
pinctrl-single,pins = <
0x94 (PIN_INPUT_PULLDOWN | MUX_MODE7) /* gpmc_oen_ren.gpio2_3 /
0x90 (PIN_INPUT_PULLDOWN | MUX_MODE7) /* gpmc_advn_ale.gpio2_2 /
0x70 (PIN_INPUT_PULLDOWN | MUX_MODE7) /* gpmc_wait0.gpio0_30 /
0x9c (PIN_INPUT_PULLDOWN | MUX_MODE7) /* gpmc_ben0_cle.gpio2_5 /
>;
};
*/

...

/*
mmc2_pins: pinmux_mmc2_pins {
pinctrl-single,pins = <
0x74 (PIN_INPUT_PULLUP | MUX_MODE7) /* gpmc_wpn.gpio0_31 /
0x80 (PIN_INPUT_PULLUP | MUX_MODE2) /* gpmc_csn1.mmc1_clk /
0x84 (PIN_INPUT_PULLUP | MUX_MODE2) /* gpmc_csn2.mmc1_cmd *
0x00 (PIN_INPUT_PULLUP | MUX_MODE1) /* gpmc_ad0.mmc1_dat0 /
0x04 (PIN_INPUT_PULLUP | MUX_MODE1) /* gpmc_ad1.mmc1_dat1 /
0x08 (PIN_INPUT_PULLUP | MUX_MODE1) /* gpmc_ad2.mmc1_dat2 /
0x0c (PIN_INPUT_PULLUP | MUX_MODE1) /* gpmc_ad3.mmc1_dat3 /
>;
};
*/
};

/*
&mmc2 {
status = "okay";
vmmc-supply = <&wl12xx_vmmc>;
ti,non-removable;
bus-width = <4>;
cap-power-off-card;
pinctrl-names = "default";
pinctrl-0 = <&mmc2_pins>;
};
*/

And in am33xx.dtsi:

/*
mmc2: mmc@481d8000 {
compatible = "ti,omap4-hsmmc";
ti,hwmods = "mmc2";
ti,needs-special-reset;
dmas = <&edma 2
&edma 3>;
dma-names = "tx", "rx";
interrupts = <28>;
interrupt-parent = <&intc>;
reg = <0x481d8000 0x1000>;
status = "disabled";
};
*/