How to access blank emmc from linux uart shell

Can you post your boot console messages and the fdisk hang?

Steve K.

================================================Kernel Boot log========================================================
Kernel image @ 0x82000000 [ 0x000000 - 0xdf2998 ]
## Flattened Device Tree blob at 87000000
Booting using the fdt blob at 0x87000000
Loading Device Tree to 86730000, end 8673aa0b ... OK

Starting kernel ...

[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 3.14.26-g245f240-dirty (preetam@preetam-core) (gcc version 4.8.2 (Ubuntu/Linaro 4.8.2-16ubuntu4) ) #25 Tue Jun 16 10:38:28 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
[ 0.000000] bootconsole [earlycon0] enabled
[ 0.000000] cma: CMA: reserved 24 MiB at 84800000
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] CPU: All CPU(s) started in SVC mode.
[ 0.000000] AM335X ES1.0 (neon )
[ 0.000000] Kernel command line: console=ttyO0,115200n8 earlyprintk=serial mem=128m
[ 0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
[ 0.000000] vmalloc : 0xc8800000 - 0xff000000 ( 872 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xc8000000 ( 128 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .text : 0xc0008000 - 0xc082101c (8293 kB)
[ 0.000000] .init : 0xc0822000 - 0xc12350ec (10317 kB)
[ 0.000000] .data : 0xc1236000 - 0xc1290df8 ( 364 kB)
[ 0.000000] .bss : 0xc1290df8 - 0xc12caca8 ( 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
[ 0.008252] OMAP clocksource: timer1 at 24000000 Hz
[ 0.013653] Console: colour dummy device 80x30
[ 0.018341] Calibrating delay loop... 718.02 BogoMIPS (lpj=3590144)
[ 0.076579] pid_max: default: 32768 minimum: 301
[ 0.081496] Security Framework initialized
[ 0.085891] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.092783] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.107001] CPU: Testing write buffer coherency: ok
[ 0.112456] Setting up static identity map for 0x805e0f40 - 0x805e0f98
[ 0.124488] devtmpfs: initialized
[ 0.129837] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[ 0.140409] ------------[ cut here ]------------
[ 0.145299] WARNING: CPU: 0 PID: 1 at /home/preetam/Workspace/neato/ti-processor-sdk-linux-am335x-evm-01.00.00.00/board-support/linux-3.14.26-g2489c02/arch/arm/mach-omap2/omap_hwmod.c:2568 _init+0x500/)
[ 0.164837] ---[ end trace b41b793a62d06332 ]---
[ 0.175041] omap_hwmod: tptc0 using broken dt data from edma
[ 0.181025] omap_hwmod: tptc1 using broken dt data from edma
[ 0.187021] omap_hwmod: tptc2 using broken dt data from edma
[ 0.193337] ------------[ cut here ]------------
[ 0.198192] WARNING: CPU: 0 PID: 1 at /home/preetam/Workspace/neato/ti-processor-sdk-linux-am335x-evm-01.00.00.00/board-support/linux-3.14.26-g2489c02/arch/arm/mach-omap2/omap_hwmod.c:2568 _init+0x500/)
[ 0.217647] ---[ end trace b41b793a62d06333 ]---
[ 0.226395] omap_hwmod: debugss: _wait_target_disable failed
[ 0.261473] pinctrl core: initialized pinctrl subsystem
[ 0.268040] regulator-dummy: no parameters
[ 0.274616] NET: Registered protocol family 16
[ 0.281328] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.291160] cpuidle: using governor ladder
[ 0.295534] cpuidle: using governor menu
[ 0.306829] syscon 44e10000.control_module: regmap [mem 0x44e10000-0x44e107fb] registered
[ 0.316960] platform 49000000.edma: alias fck already exists
[ 0.322882] platform 49000000.edma: alias fck already exists
[ 0.328873] platform 49000000.edma: alias fck already exists
[ 0.335988] OMAP GPIO hardware version 0.1
[ 0.354844] No ATAGs?
[ 0.357012] hw-breakpoint: debug architecture 0x4 unsupported.
[ 0.390945] bio: create slab <bio-0> at 0
[ 0.411526] edma-dma-engine edma-dma-engine.0: TI EDMA DMA engine driver
[ 0.419585] vbat: 5000 mV
[ 0.422848] lis3_reg: no parameters
[ 0.427076] wlan-en-regulator: 1800 mV
[ 0.432641] vgaarb: loaded
[ 0.436529] SCSI subsystem initialized
[ 0.442011] usbcore: registered new interface driver usbfs
[ 0.447985] usbcore: registered new interface driver hub
[ 0.453758] usbcore: registered new device driver usb
[ 0.460061] omap_i2c 44e0b000.i2c: could not find pctldev for node /pinmux@44e10800/pinmux_i2c0_pins, deferring probe
[ 0.471150] platform 44e0b000.i2c: Driver omap_i2c requests probe deferral
[ 0.478343] omap_i2c 4802a000.i2c: could not find pctldev for node /pinmux@44e10800/pinmux_i2c1_pins, deferring probe
[ 0.489358] platform 4802a000.i2c: Driver omap_i2c requests probe deferral
[ 0.496875] pps_core: LinuxPPS API ver. 1 registered
[ 0.502069] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.511708] PTP clock support registered
[ 0.517908] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[ 0.525174] Advanced Linux Sound Architecture Driver Initialized.
[ 0.533122] Switched to clocksource timer1
[ 0.558240] NET: Registered protocol family 2
[ 0.563822] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.571086] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.577747] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.584438] TCP: reno registered
[ 0.587847] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.593957] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.600688] NET: Registered protocol family 1
[ 0.605588] RPC: Registered named UNIX socket transport module.
[ 0.611765] RPC: Registered udp transport module.
[ 0.616711] RPC: Registered tcp transport module.
[ 0.621632] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.632544] hw perfevents: enabled with ARMv7 Cortex-A8 PMU driver, 5 counters available
[ 1.644461] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 1.837867] VFS: Disk quotas dquot_6.5.2
[ 1.842588] NFS: Registering the id_resolver key type
[ 1.848024] Key type id_resolver registered
[ 1.852412] Key type id_legacy registered
[ 1.856671] jffs2: version 2.2. (NAND) (SUMMARY) �© 2001-2006 Red Hat, Inc.
[ 1.864194] msgmni has been set to 211
[ 1.869659] NET: Registered protocol family 38
[ 1.874426] io scheduler noop registered
[ 1.878547] io scheduler deadline registered
[ 1.883035] io scheduler cfq registered (default)
[ 1.889684] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
[ 1.900492] backlight.9 supply power not found, using dummy regulator
[ 1.910597] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 1.920388] omap_uart 44e09000.serial: no wakeirq for uart0
[ 1.926425] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0
[ 1.936110] console [ttyO0] enabled
[ 1.936110] console [ttyO0] enabled
[ 1.943432] bootconsole [earlycon0] disabled
[ 1.943432] bootconsole [earlycon0] disabled
[ 1.953031] omap_uart 48022000.serial: no wakeirq for uart0
[ 1.959097] 48022000.serial: ttyO1 at MMIO 0x48022000 (irq = 89, base_baud = 3000000) is a OMAP UART1
[ 1.970145] omap_rng 48310000.rng: OMAP Random Number Generator ver. 20
[ 1.977534] [drm] Initialized drm 1.1.0 20060810
[ 1.994041] brd: module loaded
[ 2.003071] loop: module loaded
[ 2.006808] (stk) :sysfs entries created
[ 2.010935] (stk) : debugfs entries created
[ 2.015459] (hci_tty): inside hci_tty_init
[ 2.020431] (hci_tty): allocated 249, 0
[ 2.027708] mtdoops: mtd device (mtddev=name/number) must be supplied
[ 2.038672] usbcore: registered new interface driver asix
[ 2.044597] usbcore: registered new interface driver ax88179_178a
[ 2.051154] usbcore: registered new interface driver cdc_ether
[ 2.057446] usbcore: registered new interface driver smsc95xx
[ 2.063649] usbcore: registered new interface driver net1080
[ 2.069754] usbcore: registered new interface driver cdc_subset
[ 2.076095] usbcore: registered new interface driver zaurus
[ 2.082180] usbcore: registered new interface driver cdc_ncm
[ 2.088602] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 2.095501] ehci-pci: EHCI PCI platform driver
[ 2.100316] ehci-omap: OMAP-EHCI Host Controller driver
[ 2.106312] usbcore: registered new interface driver cdc_wdm
[ 2.112455] usbcore: registered new interface driver usb-storage
[ 2.119878] mousedev: PS/2 mouse device common for all mice
[ 2.126820] TI-am335x-tsc TI-am335x-tsc: ti,charge-delay not specified
[ 2.134176] input: ti-tsc as /devices/ocp.3/44e0d000.tscadc/TI-am335x-tsc/input/input0
[ 2.143990] i2c /dev entries driver
[ 2.147844] Driver for 1-wire Dallas network protocol.
[ 2.155887] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[ 2.164953] omap_hsmmc 48060000.mmc: unable to get vmmc regulator -517
[ 2.171893] platform 48060000.mmc: Driver omap_hsmmc requests probe deferral
[ 2.180030] ledtrig-cpu: registered to indicate activity on CPUs
[ 2.186671] omap-aes 53500000.aes: OMAP AES hw accel rev: 3.2
[ 2.193987] omap-sham 53100000.sham: hw accel on OMAP rev 4.3
[ 2.201599] usbcore: registered new interface driver usbhid
[ 2.207465] usbhid: USB HID core driver
[ 2.211726] platform 44d00000.wkup_m3: Driver wkup_m3 requests probe deferral
[ 2.222215] oprofile: using arm/armv7
[ 2.226434] TCP: cubic registered
[ 2.229912] Initializing XFRM netlink socket
[ 2.234407] NET: Registered protocol family 17
[ 2.239094] NET: Registered protocol family 15
[ 2.243866] Key type dns_resolver registered
[ 2.248975] cpu cpu0: of_pm_voltdm_notifier_register: Failed to get cpu0 regulator/voltdm: -517
[ 2.258122] cpu cpu0: cpu0 clock notifier not ready, retry
[ 2.263960] platform cpufreq-cpu0.0: Driver cpufreq-cpu0 requests probe deferral
[ 2.272337] PM: no-rtc available, rtc-only mode disabled.
[ 2.278040] ThumbEE CPU extension supported.
[ 2.282601] Registering SWP/SWPB emulation handler
[ 2.289167] wlan-en-regulator: disabling
[ 2.293385] lis3_reg: disabling
[ 2.296677] vbat: disabling
[ 2.299598] regulator-dummy: disabling
[ 2.313178] tps65910 0-002d: No interrupt support, no core IRQ
[ 2.323802] vrtc: 1800 mV
[ 2.326916] vrtc: supplied by vbat
[ 2.332212] vio: at 1500 mV
[ 2.335338] vio: supplied by vbat
[ 2.340652] vdd_mpu: 912 <--> 1375 mV at 1137 mV
[ 2.345672] vdd_mpu: supplied by vbat
[ 2.351324] vdd_core: 912 <--> 1150 mV at 1137 mV
[ 2.356429] vdd_core: supplied by vbat
[ 2.361830] vdd3: 5000 mV
[ 2.366064] vdig1: at 1800 mV
[ 2.369343] vdig1: supplied by vbat
[ 2.374405] vdig2: at 1800 mV
[ 2.377689] vdig2: supplied by vbat
[ 2.382741] vpll: at 1800 mV
[ 2.385942] vpll: supplied by vbat
[ 2.390900] vdac: at 1800 mV
[ 2.394101] vdac: supplied by vbat
[ 2.399069] vaux1: at 1800 mV
[ 2.402345] vaux1: supplied by vbat
[ 2.407403] vaux2: at 3300 mV
[ 2.410678] vaux2: supplied by vbat
[ 2.415780] vaux33: at 3300 mV
[ 2.419141] vaux33: supplied by vbat
[ 2.424284] vmmc: 1800 <--> 3300 mV at 3300 mV
[ 2.429102] vmmc: supplied by vbat
[ 2.434207] tps65910-rtc tps65910-rtc: IRQ is not free.
[ 2.439692] tps65910-rtc: probe of tps65910-rtc failed with error -22
[ 2.446814] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[ 2.453960] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 100 kHz
[ 2.493749] remoteproc0: wkup_m3 is available
[ 2.498446] remoteproc0: Note: remoteproc is still under development and considered experimental.
[ 2.507828] remoteproc0: THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.
[ 2.521205] cpu cpu0: of_pm_voltdm_notifier_register: Fail calculating voltage latency[1100000<->1260000]:-22
[ 2.531700] remoteproc0: powering up wkup_m3
[ 2.536891] remoteproc0: Booting fw image am335x-pm-firmware.elf, size 154412
[ 2.546604] PM: CM3 Firmware Version = 0x190
[ 2.552590] input: volume_keys.8 as /devices/volume_keys.8/input/input1
[ 2.561698] remoteproc0: remote processor wkup_m3 is now up
[ 2.568664] /home/preetam/Workspace/neato/ti-processor-sdk-linux-am335x-evm-01.00.00.00/board-support/linux-3.14.26-g2489c02/drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
[ 2.588743] ALSA device list:
[ 2.591933] No soundcards found.
[ 2.595708] Warning: unable to open an initial console.
[ 2.615108] Freeing unused kernel memory: 10316K (c0822000 - c1235000)
[ 2.657608] mmc0: BKOPS_EN bit is not set
[ 2.666587] mmc0: new high speed MMC card at address 0001
[ 2.673037] mmcblk0: mmc0:0001 MMC02G 1.78 GiB
[ 2.679100] mmcblk0boot0: mmc0:0001 MMC02G partition 1 1.00 MiB
[ 2.685499] mmcblk0boot1: mmc0:0001 MMC02G partition 2 1.00 MiB
[ 3.652840] udevd[803]: starting version 182
[ 6.320291] random: dd urandom read with 90 bits of entropy available
rpcbind: cannot create socket for udp6
rpcbind: cannot create socket for tcp6
[ 8.479844] random: nonblocking pool is initialized

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

Arago Project http://arago-project.org am335x-evm /dev/ttyO0

Arago 2015.03 am335x-evm /dev/ttyO0

am335x-evm login: root

======================================================================================================================
=========================================================Console actions==============================================
root@am335x-evm:~# ls /dev
block ram1 tty21 tty53
char ram10 tty22 tty54
console ram11 tty23 tty55
cpu_dma_latency ram12 tty24 tty56
fd ram13 tty25 tty57
full ram14 tty26 tty58
hci_tty ram15 tty27 tty59
hwrng ram2 tty28 tty6
i2c-0 ram3 tty29 tty60
i2c-1 ram4 tty3 tty61
initctl ram5 tty30 tty62
input ram6 tty31 tty63
kmem ram7 tty32 tty7
kmsg ram8 tty33 tty8
log ram9 tty34 tty9
loop-control random tty35 ttyO0
loop0 rfkill tty36 ttyO1
loop1 shm tty37 ttyS0
loop2 snd tty38 ttyS1
loop3 stdin tty39 ttyS2
loop4 tty tty4 ttyS3
loop5 tty0 tty40 ubi_ctrl
loop6 tty1 tty41 udev_network_queue
loop7 tty10 tty42 urandom
mem tty11 tty43 usbmon0
mmcblk0 tty12 tty44 vcs
mtab tty13 tty45 vcs1
network_latency tty14 tty46 vcsa
network_throughput tty15 tty47 vcsa1
null tty16 tty48 vga_arbiter
port tty17 tty49 watchdog
psaux tty18 tty5 watchdog0
ptmx tty19 tty50 zero
pts tty2 tty51
ram0 tty20 tty52

root@am335x-evm:/sys/class/mmc_host# ls
mmc0

root@am335x-evm:/sys/class/mmc_host/mmc0# cat device/driver/48060000.mmc/modalias
of:NmmcT<NULL>Cti,omap4-hsmmcroot@am335x-evm:/sys/class/mmc_host/mmc0# ls
device mmc0:0001 power subsystem uevent

root@am335x-evm:/sys/class/mmc_host/mmc0/mmc0:0001# ls
block fwrev raw_rpmb_size_mult
cid hwrev rel_sectors
csd manfid serial
date name subsystem
driver oemid type
enhanced_area_offset power uevent
enhanced_area_size preferred_erase_size
erase_size prv

root@am335x-evm:~# sfdisk -s /dev/mmcblk0
^C^C^C^C^X^Z^X^X^Z^Z
;
;
;
;
;
;
;
;
;
;
;
;
;;
;
;
;
;
;
;
\

=====================================================================================================================
After this I just reset the board.

-Preetam-