No Video Display on LCD of AM335x EVM

Tim Simerly

Other Parts Discussed in Thread: DA8XX

Hey Support Team:

I am trying to bring up my customer's AM335x EVM and went through the normal Quick Start Guide steps and booted up using the Linux SD card that is supplied in the box and I don't see any video displayed on the LCD although it does take me to the login prompt. Is there something else that you are supposed to do to get video output on the LCD?

In addition, I tried booting up with the Android SD card supplied in the box and it hangs during an I2C access - I tried this several times and it does it every time.

Any idea as to what may be going on? This is a brand new EVM that has just been opened.

Thanks,
Tim

over 13 years ago

0 Prakash PM over 13 years ago

TI__Intellectual 1275 points

Hi Tim,

Can you please check profile configuration on the EVM? LCDC is enabled only in profiles: 0, 1, 2 and 7.

If above is correct then /dev/fb0 is created on successful loading of da8xx-fb LCDC driver.

Thanks,

Prakash

0 Chase Maupin over 13 years ago in reply to Prakash PM

TI__Expert 5450 points

Also post the boot output. Depending on the version of software on your SD card if the EEPROM identifying the board cannot be read you will get a default of beaglebone. This will boot but things like the LCD will not be initialized. The kernel boot messages will tell you if you are defaulting to beaglebone.

Chase

0 Tim Simerly over 13 years ago in reply to Chase Maupin

TI__Genius 9975 points

Prakash:

Thanks for responding, below is what I get out from the boot-up:

[ 0.779650] The board is general purpose EVM in profile 0

Looks like it is using profile 0. Is this ok?

Chase:

Attached (see below) is my console output from the booting up of the EVM. I don't see any reference to beagle in the text output. From this file, I get the following snippet during the boot ouput:

[    0.770206] Board name: A33515BB
[    0.773618] Board version: 1.1A
[    0.776919] SKU: SKU#01
[    0.779650] The board is general purpose EVM in profile 0
[    0.786416] da8xx_lcdc da8xx_lcdc.0: GLCD: Found TFC_S9700RTWV35TR_01B panel
[    0.811438] Console: switching to colour frame buffer device 100x30

Any ideas as to what may be the problem from this bootup output?

Thanks,
Tim

Fullscreen 1033.ConsoleBootupAM335x.txt Download

U-Boot SPL 2011.09 (Dec 11 2011 - 13:24:49)
Texas Instruments Revision detection unimplemented
OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img


U-Boot 2011.09 (Dec 11 2011 - 12:58:10)

I2C:   ready
DRAM:  256 MiB
WARNING: Caches not enabled
Found a daughter card connected
NAND:  HW ECC Hamming Code selected
256 MiB
MMC:   OMAP SD/MMC: 0
*** Warning - bad CRC, using default environment

Net:   cpsw
Hit any key to stop autoboot:  0
SD/MMC found on device 0
reading uEnv.txt

** Unable to read "uEnv.txt" from mmc 0:1 **
reading uImage

2922224 bytes read
## Booting kernel from Legacy Image at 80007fc0 ...
   Image Name:   Arago/3.1.0-psp04.06.00.03.sdk/a
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2922160 Bytes = 2.8 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
   XIP Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
[    0.000000] Linux version 3.1.0 (jenkins@sdit-build01) (gcc version 4.5.3 20110311 (prerelease) (GCC) ) #1 Sun Dec 11 12:45:19 CST 2011
[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f
[    0.000000] CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine: am335xevm
[    0.000000] Memory policy: ECC disabled, Data cache writeback
[    0.000000] AM335X ES1.0 (neon )
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024
[    0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait ip=none
[    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: 256MB = 256MB total
[    0.000000] Memory: 253724k/253724k available, 8420k 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]     DMA     : 0xffa00000 - 0xffe00000   (   4 MB)
[    0.000000]     vmalloc : 0xd0800000 - 0xf8000000   ( 632 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
[    0.000000]     modules : 0xbf000000 - 0xc0000000   (  16 MB)
[    0.000000]       .text : 0xc0008000 - 0xc0534000   (5296 kB)
[    0.000000]       .init : 0xc0534000 - 0xc056d000   ( 228 kB)
[    0.000000]       .data : 0xc056e000 - 0xc05c2d80   ( 340 kB)
[    0.000000]        .bss : 0xc05c2da4 - 0xc05fd320   ( 234 kB)
[    0.000000] NR_IRQS:396
[    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: GPTIMER1 at 24000000 Hz
[    0.000000] OMAP clocksource: GPTIMER2 at 24000000 Hz
[    0.000000] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
[    0.000000] Console: colour dummy device 80x30
[    0.000247] Calibrating delay loop... 498.89 BogoMIPS (lpj=2494464)
[    0.058634] pid_max: default: 32768 minimum: 301
[    0.058791] Security Framework initialized
[    0.058914] Mount-cache hash table entries: 512
[    0.059361] CPU: Testing write buffer coherency: ok
[    0.064870] print_constraints: dummy:
[    0.065333] NET: Registered protocol family 16
[    0.065746] GPMC revision 6.0
[    0.068321] OMAP GPIO hardware version 0.1
[    0.071240] omap_l3_smx omap_l3_smx.0: couldn't find resource
[    0.071861] omap_mux_init: Add partition: #1: core, flags: 0
[    0.075798]  omap_i2c.1: alias fck already exists
[    0.077762]  omap2_mcspi.1: alias fck already exists
[    0.078045]  omap2_mcspi.2: alias fck already exists
[    0.107875] bio: create slab <bio-0> at 0
[    0.110728] SCSI subsystem initialized
[    0.112809] usbcore: registered new interface driver usbfs
[    0.113230] usbcore: registered new interface driver hub
[    0.113500] usbcore: registered new device driver usb
[    0.128781] omap_i2c omap_i2c.1: bus 1 rev4.0 at 100 kHz
[    0.131444] Advanced Linux Sound Architecture Driver Version 1.0.24.
[    0.132797] Switching to clocksource gp timer
[    0.138702] Switched to NOHz mode on CPU #0
[    0.153877] musb-hdrc: version 6.0, ?dma?, otg (peripheral+host)
[    0.154106] musb-hdrc musb-hdrc.0: dma type: pio
[    0.155175] musb-hdrc musb-hdrc.0: USB OTG mode controller at d080a000 using PIO, IRQ 18
[    0.155384] musb-hdrc musb-hdrc.1: dma type: pio
[    0.156273] musb-hdrc musb-hdrc.1: USB OTG mode controller at d080c800 using PIO, IRQ 19
[    0.156770] NET: Registered protocol family 2
[    0.157003] IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
[    0.157359] TCP established hash table entries: 8192 (order: 4, 65536 bytes)
[    0.157582] TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
[    0.157717] TCP: Hash tables configured (established 8192 bind 8192)
[    0.157734] TCP reno registered
[    0.157751] UDP hash table entries: 256 (order: 0, 4096 bytes)
[    0.157783] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[    0.158032] NET: Registered protocol family 1
[    0.158383] RPC: Registered named UNIX socket transport module.
[    0.158401] RPC: Registered udp transport module.
[    0.158414] RPC: Registered tcp transport module.
[    0.158427] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.158701] NetWinder Floating Point Emulator V0.97 (double precision)
[    0.172357] VFS: Disk quotas dquot_6.5.2
[    0.172443] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.173267] JFFS2 version 2.2. (NAND) (SUMMARY)  � 2001-2006 Red Hat, Inc.
[    0.173664] msgmni has been set to 495
[    0.174631] io scheduler noop registered
[    0.174651] io scheduler deadline registered
[    0.174746] io scheduler cfq registered (default)
[    0.175858] Could not set LED4 to fully on
[    0.177888] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.180055] omap_uart.0: ttyO0 at MMIO 0x44e09000 (irq = 72) is a OMAP UART0
[    0.659553] console [ttyO0] enabled
[    0.663927] omap_uart.1: ttyO1 at MMIO 0x48022000 (irq = 73) is a OMAP UART1
[    0.671785] omap_uart.2: ttyO2 at MMIO 0x48024000 (irq = 74) is a OMAP UART2
[    0.679721] omap_uart.3: ttyO3 at MMIO 0x481a6000 (irq = 44) is a OMAP UART3
[    0.687600] omap_uart.4: ttyO4 at MMIO 0x481a8000 (irq = 45) is a OMAP UART4
[    0.695463] omap_uart.5: ttyO5 at MMIO 0x481aa000 (irq = 46) is a OMAP UART5
[    0.715116] brd: module loaded
[    0.724848] loop: module loaded
[    0.728369] i2c-core: driver [tsl2550] using legacy suspend method
[    0.734919] i2c-core: driver [tsl2550] using legacy resume method
[    0.741414] at24 1-0051: 32768 byte 24c256 EEPROM, writable, 64 bytes/write
[    0.749414] Detected a daughter card on AM335x EVM..
[    0.754532] at24 1-0050: 32768 byte 24c256 EEPROM, writable, 64 bytes/write
[    0.770206] Board name: A33515BB
[    0.773618] Board version: 1.1A
[    0.776919] SKU: SKU#01
[    0.779650] The board is general purpose EVM in profile 0
[    0.786416] da8xx_lcdc da8xx_lcdc.0: GLCD: Found TFC_S9700RTWV35TR_01B panel
[    0.811438] Console: switching to colour frame buffer device 100x30
[    0.826482] TSC connected to beta GP EVM
[    0.831982]  omap_i2c.2: alias fck already exists
[    0.852909] omap_i2c omap_i2c.2: bus 2 rev4.0 at 100 kHz
[    0.859551] tsl2550 2-0039: standard operating mode
[    0.865430] tsl2550 2-0039: support ver. 1.2 enabled
[    0.871592]  omap_hsmmc.0: alias fck already exists
[    0.877202]  omap_hsmmc.2: alias fck already exists
[    0.882669] Configure Bluetooth Enable pin...
[    0.887377] _omap_mux_get_by_name: Could not find signal gpmc_a8.gpio1_22
[    0.896487] lis3lv02d: 8 bits 3DLH sensor found
[    0.973353] input: ST LIS3LV02DL Accelerometer as /devices/platform/lis3lv02d/input/input0
[    0.984740] mtdoops: mtd device (mtddev=name/number) must be supplied
[    0.991764] omap2-nand driver initializing
[    0.996517] ONFI flash detected
[    0.999932] ONFI param page 0 valid
[    1.003622] NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron MT29F2G08ABAEAWP)
[    1.012008] Creating 8 MTD partitions on "omap2-nand.0":
[    1.017582] 0x000000000000-0x000000020000 : "SPL"
[    1.024608] 0x000000020000-0x000000040000 : "SPL.backup1"
[    1.031947] 0x000000040000-0x000000060000 : "SPL.backup2"
[    1.039450] 0x000000060000-0x000000080000 : "SPL.backup3"
[    1.047108] 0x000000080000-0x000000260000 : "U-Boot"
[    1.054859] 0x000000260000-0x000000280000 : "U-Boot Env"
[    1.062022] 0x000000280000-0x000000780000 : "Kernel"
[    1.070998] 0x000000780000-0x000010000000 : "File System"
[    1.181496] OneNAND driver initializing
[    1.232872] davinci_mdio davinci_mdio.0: davinci mdio revision 1.6
[    1.239385] davinci_mdio davinci_mdio.0: detected phy mask fffffffe
[    1.246744] davinci_mdio.0: probed
[    1.250341] davinci_mdio davinci_mdio.0: phy[0]: device 0:00, driver unknown
[    1.258005] CAN device driver interface
[    1.262038] CAN bus driver for Bosch D_CAN controller 1.0
[    1.268702] usbcore: registered new interface driver cdc_ether
[    1.275130] usbcore: registered new interface driver cdc_subset
[    1.281417] Initializing USB Mass Storage driver...
[    1.286825] usbcore: registered new interface driver usb-storage
[    1.293170] USB Mass Storage support registered.
[    1.298090] musb-hdrc musb-hdrc.1: MUSB HDRC host driver
[    1.303784] musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 1
[    1.311692] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    1.318867] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.326478] usb usb1: Product: MUSB HDRC host driver
[    1.331701] usb usb1: Manufacturer: Linux 3.1.0 musb-hcd
[    1.337298] usb usb1: SerialNumber: musb-hdrc.1
[    1.343152] hub 1-0:1.0: USB hub found
[    1.347141] hub 1-0:1.0: 1 port detected
[    1.352621] mousedev: PS/2 mouse device common for all mice
[    1.359755] input: matrix-keypad as /devices/platform/matrix-keypad/input/input1
[    1.369370] input: ti-tsc-adcc as /devices/platform/tsc/input/input2
[    1.377461] omap_rtc omap_rtc: rtc core: registered omap_rtc as rtc0
[    1.384517] i2c /dev entries driver
[    1.390017] lm75 2-0048: hwmon0: sensor 'tmp275'
[    1.546378] OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[    1.553382] cpuidle: using governor ladder
[    1.558357] cpuidle: using governor menu
[    1.567637] usbcore: registered new interface driver usbhid
[    1.573583] usbhid: USB HID core driver
[    1.578646] usbcore: registered new interface driver snd-usb-audio
[    1.587968] _regulator_get: 2-001b supply IOVDD not found, using dummy regulator
[    1.595924] _regulator_get: 2-001b supply DVDD not found, using dummy regulator
[    1.603702] _regulator_get: 2-001b supply AVDD not found, using dummy regulator
[    1.611444] _regulator_get: 2-001b supply DRVDD not found, using dummy regulator
[    1.656149] mmc0: new high speed SDHC card at address 1234
[    1.662890] mmcblk0: mmc0:1234 SA04G 3.63 GiB
[    1.670310]  mmcblk0: p1 p2 p3
[    1.748304] asoc: tlv320aic3x-hifi <-> davinci-mcasp.1 mapping ok
[    1.756257] ALSA device list:
[    1.759384]   #0: AM335X EVM
[    1.762409] oprofile: hardware counters not available
[    1.767772] oprofile: using timer interrupt.
[    1.772299] nf_conntrack version 0.5.0 (3964 buckets, 15856 max)
[    1.779265] ip_tables: (C) 2000-2006 Netfilter Core Team
[    1.785036] TCP cubic registered
[    1.788436] NET: Registered protocol family 17
[    1.793152] can: controller area network core (rev 20090105 abi 8)
[    1.799766] NET: Registered protocol family 29
[    1.804466] can: raw protocol (rev 20090105)
[    1.808956] can: broadcast manager protocol (rev 20090105 t)
[    1.814975] Registering the dns_resolver key type
[    1.820009] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[    1.828100] ThumbEE CPU extension supported.
[    1.833547] _regulator_get: mpu.0 supply mpu not found, using dummy regulator
[    1.841167] omap2_set_init_voltage: Fail set voltage-dpll_mpu_ck(f=500000000 v=1100000)on vddmpu
[    1.850444] omap2_set_init_voltage: unable to set vdd_mpu
[    1.858820] Detected MACID=d4:94:a1:32:8a:b2
[    1.865970] input: gpio-keys as /devices/platform/gpio-keys/input/input3
[    1.874049] omap_rtc omap_rtc: setting system clock to 2000-01-01 00:00:01 UTC (946684801)
[    1.887880] mmc1: card claims to support voltages below the defined range. These will be ignored.
[    1.909087] mmc1: queuing unknown CIS tuple 0x91 (3 bytes)
[    1.916264] mmc1: new SDIO card at address 0001
[    9.381409] kjournald starting.  Commit interval 5 seconds
[    9.387309] EXT3-fs (mmcblk0p2): warning: maximal mount count reached, running e2fsck is recommended
[   10.103253] EXT3-fs (mmcblk0p2): using internal journal
[   10.108754] EXT3-fs (mmcblk0p2): recovery complete
[   10.117744] EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode
[   10.125073] VFS: Mounted root (ext3 filesystem) on device 179:2.
[   10.131858] Freeing init memory: 228K
INIT: version 2.86 booting
Please wait: booting...
Starting udev
[   10.750917] udevd (649): /proc/649/oom_adj is deprecated, please use /proc/649/oom_score_adj instead.
[   12.347861] cfg80211: Calling CRDA to update world regulatory domain
[   17.469182] cfg80211: World regulatory domain updated:
[   17.474678] cfg80211:     (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[   17.483489] cfg80211:     (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   17.491838] cfg80211:     (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[   17.500181] cfg80211:     (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[   17.508524] cfg80211:     (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   17.516868] cfg80211:     (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[   17.892528] wl1271: loaded
[   18.737287] kjournald starting.  Commit interval 5 seconds
[   18.743232] EXT3-fs (mmcblk0p3): warning: maximal mount count reached, running e2fsck is recommended
[   19.465726] EXT3-fs (mmcblk0p3): using internal journal
[   19.471275] EXT3-fs (mmcblk0p3): recovery complete
[   19.476355] EXT3-fs (mmcblk0p3): mounted filesystem with ordered data mode
[   19.556060] alignment: ignoring faults is unsafe on this CPU.  Defaulting to fixup mode.
Remounting root file system...
Caching udev devnodes
ALSA: Restoring mixer settings...
Configuring network interfaces... ifconfig: SIOCGIFFLAGS: No such device
ifconfig: SIOCGIFFLAGS: No such device
eth0      No such device

ifconfig: SIOCGIFFLAGS: No such device
done.
Setting up IP spoofing protection: rp_filter.
Sun Dec 11 15:55:00 UTC 2011
INIT: Entering runlevel: 5
Starting system message bus: dbus.
Starting Hardware abstraction layer hald
Starting Dropbear SSH server: dropbear.
Starting telnet daemon.
Starting network benchmark server: netserver.
Starting syslogd/klogd: done
Starting thttpd.
Starting PVR
Starting Lighttpd Web Server: lighttpd.
2011-12-11 15:55:02: (log.c.166) server started
/
/
Starting Matrix GUI application.
[   40.172764]  gadget: Mass Storage Function, version: 2009/09/11
[   40.179158]  gadget: Number of LUNs=2
[   40.183051]  lun0: LUN: removable file: /dev/mmcblk0p1
[   40.188459]  lun1: LUN: removable file: /dev/mmcblk0p3
[   40.193925]  gadget: Mass Storage Gadget, version: 2009/09/11
[   40.199976]  gadget: userspace failed to provide iSerialNumber
[   40.206169]  gadget: g_mass_storage ready
[   40.210415] musb-hdrc musb-hdrc.0: MUSB HDRC host driver
[   40.216075] musb-hdrc musb-hdrc.0: new USB bus registered, assigned bus number 2
[   40.224029] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[   40.231179] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   40.238797] usb usb2: Product: MUSB HDRC host driver
[   40.244034] usb usb2: Manufacturer: Linux 3.1.0 musb-hcd
[   40.249619] usb usb2: SerialNumber: musb-hdrc.0
[   40.255186] hub 2-0:1.0: USB hub found
[   40.259162] hub 2-0:1.0: 1 port detected
***************************************************************
***************************************************************
NOTICE: This file system contains the followin GPLv3 packages:
        binutils-dev
        binutils-symlinks
        binutils
        gdbserver

If you do not wish to distribute GPLv3 components please remove
the above packages prior to distribution.  This can be done using
the 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
***************************************************************
***************************************************************

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

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

Arago 2011.09 am335x-evm ttyO0

am335x-evm login:

0 Prakash PM over 13 years ago in reply to Tim Simerly

TI__Intellectual 1275 points

Tim,

Do you see LCD backlight glowing?

Can you do $cat /proc/interrupts and see if LCDC interrupts are incrementing?

Please do $cat /linuxrc > /dev/fb0 and check if you something on LCD panel.

Thanks,

Prakash

0 Tim Simerly over 13 years ago in reply to Prakash PM

TI__Genius 9975 points

Prakash:

Yes, I was getting LCDC interrupts increasing over time. However I wasn't seeing a backlight glowing on the LCD. So I pulled the LCD daughter card off and tried to push in on the power connector to make sure that it was well seated and it came right off the board. So I soldered it into place and now it works fine. Do you reckon the EVM vendor is even checking these boards out for functionality before they ship them?

Anyways - thanks for your response to prompt me to check the power on the LCD panel. This issue is resolved - the EVM is working fine now. Hopefully this is just a rare occurrence in the future with these EVMs.

Thanks,
Tim

0 Hua Wang over 13 years ago in reply to Prakash PM

Prodigy 20 points

I have the same problem. When beaglebone startup, I can see a logo. then the screen became black.

root@am335x-evm:~# ls /dev/fb*
/dev/fb   /dev/fb0

root@am335x-evm:~# cat /proc/interrupts
36:      23920      INTC da8xx_lcdc

again:
root@am335x-evm:~# cat /proc/interrupts
36: 40479 INTC da8xx_lcdc

I do $cat /linuxrc > /dev/fb0 and nothing on LCD panel.

but if do: init 6,I can see the screen is right but the screen became black soon. then logo appear, then black.

I have modify the files:

tisdk_am335x-evm_defconfig

devices.c

da8xx-fb.c

board-am335xevm.c

Can you tell me why I can not use the LCD(Chipsee INNOLUX_TN92)?

Thanks.

0 Prakash PM over 13 years ago in reply to Hua Wang

TI__Intellectual 1275 points

When you say screen becomes blank, how soon it becomes blank? Can you try appending "consoleblank=0" to your bootargs?

Otherwise you can also try below when you see console blank:

$echo "0" > /sys/class/graphics/fb0/blank

Thanks,

Prakash

0 Hua Wang over 13 years ago in reply to Prakash PM

Prodigy 20 points

When I set U-Boot, the screen is white. After I input "boot<Enter>", a logo appears about 2 seconds, then the screen becomes blank at once.
If beaglebone restart(init 6), the screen will becomes white. then a logo appears about 2 seconds, then the screen becomes blank at once.
I try appending "consoleblank=0" to my bootargs:
U-Boot# setenv consoleblank 0

U-Boot# saveenv
Saving Environment to NAND...
Erasing Nand...
Attempt to erase non page aligned data

U-Boot# printenv
autoload=yes
baudrate=115200
bootargs_defaults=setenv bootargs console=${console} ${optargs}
bootcmd=if mmc rescan; then echo SD/MMC found on device ${mmc_dev};if run loadb;
bootdelay=3
bootenv=uEnv.txt
bootfile=uImage
console=ttyO0,115200n8
consoleblank=0
ethact=cpsw
...

I have not used the file uEnv.txt and have not set any other bootargs.
I try below:
root@am335x-evm:~# echo "0" > /sys/class/graphics/fb0/blank

nothing happen and the screen is still blank and black.

Thanks.

Processors

Processors forum

No Video Display on LCD of AM335x EVM