Nothing is visible on LVDS Display when connected to Nit6x

[WarheadsSE]

Hi,
I am trying to interface LVDS Display (Nit6x_1024x600) to Nitrogen 6x board.

Following is the kernal boot up logs during boot-up.

$this->bbcode_second_pass_code('', '
U-Boot 2013.07-00047-gaf468ad (Aug 26 2013 - 09:35:41)

CPU: Freescale i.MX6Q rev1.2 at 792 MHz
Reset cause: POR
Board: Nitrogen6X
DRAM: 1 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1
SF: Detected SST25VF016B with page size 4 KiB, total 2 MiB
auto-detected panel wsvga-lvds
Display: wsvga-lvds (1024x600)
In: serial
Out: serial
Err: serial
Net: using phy at 6
FEC [PRIME]
Hit any key to stop autoboot: 0
## Error: "bootcmd_base" not defined
mmc0 is current device
** Unrecognized filesystem type **
406 bytes read in 144 ms (2 KiB/s)
## Executing script at 10008000
Unknown command 'bootargs' - try 'help'
1782524 bytes read in 159 ms (10.7 MiB/s)
## Booting kernel from Legacy Image at 10800000 ...
Image Name: Linux-3.0.15-1033-g1e54cdcd
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1782460 Bytes = 1.7 MiB
Load Address: 10008000
Entry Point: 10008000
Verifying Checksum ... OK
Loading Kernel Image ... OK

Starting kernel ...

Uncompressing Linux...
done, booting the kernel.
Linux version 3.0.15-1033-g1e54cdcd (ubuntu@ubuntu-WSG52B55W7-0248) (gcc version 4.4.4 (4.4.4_09.06.20103
CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: Freescale i.MX 6Quad Sabre-Lite Board
vmalloc area too small, limiting to 16MB
Memory policy: ECC disabled, Data cache writealloc
PERCPU: Embedded 7 pages/cpu @8c008000 s4512 r8192 d15968 u32768
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 227328
Kernel command line: console=ttymxc1,115200 video=mxcfb0:dev=ldb,1024x600M,if=RGB666 vmalloc=400 video=mM
PID hash table entries: 4096 (order: 2, 16384 bytes)
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 640MB 256MB = 896MB total
Memory: 904764k/904764k available, 143812k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xf4600000 - 0xffe00000 ( 184 MB)
vmalloc : 0xc0800000 - 0xf2000000 ( 792 MB)
lowmem : 0x80000000 - 0xc0000000 (1024 MB)
pkmap : 0x7fe00000 - 0x80000000 ( 2 MB)
modules : 0x7f000000 - 0x7fe00000 ( 14 MB)
.init : 0x80008000 - 0x8002a000 ( 136 kB)
.text : 0x8002a000 - 0x8032fb00 (3095 kB)
.data : 0x80330000 - 0x8035d380 ( 181 kB)
.bss : 0x8035d3a4 - 0x80383884 ( 154 kB)
SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Preemptible hierarchical RCU implementation.
Verbose stalled-CPUs detection is disabled.
NR_IRQS:496
MXC GPIO hardware
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms
MXC_Early serial console at MMIO 0x21e8000 (options '115200')
bootconsole [ttymxc1] enabled
Console: colour dummy device 80x30
Calibrating delay loop... 1581.05 BogoMIPS (lpj=7905280)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
CPU1: Booted secondary processor
CPU2: Booted secondary processor
CPU3: Booted secondary processor
Brought up 4 CPUs
SMP: Total of 4 processors activated (6324.22 BogoMIPS).
print_constraints: dummy:
NET: Registered protocol family 16
cpaddr = c0840000 wait_iram_base=c0812000
print_constraints: vddpu: 725 <--> 1300 mV at 1150 mV fast normal
print_constraints: vddcore: 725 <--> 1300 mV at 1150 mV fast normal
print_constraints: vddsoc: 725 <--> 1300 mV at 1200 mV fast normal
print_constraints: vdd2p5: 2000 <--> 2775 mV at 2400 mV fast normal
print_constraints: vdd1p1: 800 <--> 1400 mV at 1100 mV fast normal
print_constraints: vdd3p0: 2800 <--> 3150 mV at 3000 mV fast normal
L310 cache controller enabled
l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x02070000, Cache size: 1048576 B
IMX usb wakeup probe
IMX usb wakeup probe
bio: create slab <bio-0> at 0
print_constraints: VDDA: 2500 mV
print_constraints: VDDIO: 3300 mV
machine_constraints_voltage: VDDD: unsupportable voltage constraints
reg-fixed-voltage reg-fixed-voltage.2: Failed to register regulator: -22
reg-fixed-voltage: probe of reg-fixed-voltage.2 failed with error -22
print_constraints: vmmc: 3300 mV
SCSI subsystem initialized
imx-ipuv3 imx-ipuv3.0: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
imx-ipuv3 imx-ipuv3.1: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)
Advanced Linux Sound Architecture Driver Version 1.0.24.
Switching to clocksource mxc_timer1
Clockevents: could not switch to one-shot mode:
Clockevents: could not switch to one-shot mode:
Clockevents: could not switch to one-shot mode:
Clockevents: could not switch to one-shot mode: dummy_timer is not functional.
dummy_timer is not functional.
dummy_timer is not functional.
Could not switch to high resolution mode on CPU 2
Could not switch to high resolution mode on CPU 0
Could not switch to high resolution mode on CPU 1
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 7, 786432 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered
UDP hash table entries: 512 (order: 2, 16384 bytes)
UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
NET: Registered protocol family 1
Bus freq driver module loaded
Static Power Management for Freescale i.MX6
cpaddr = c0841000 suspend_iram_base=c08b8000
PM driver module loaded
i.MXC CPU frequency driver
msgmni has been set to 1767
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
dummy_timer is not functional.
Could not switch to high resolution mode on CPU 3
mxc_sdc_fb mxc_sdc_fb.0: register mxc display driver ldb
mxc_sdc_fb mxc_sdc_fb.0: NO mxc display driver found!
mxc_sdc_fb mxc_sdc_fb.1: register mxc display driver lcd
imx-ipuv3 imx-ipuv3.0: Channel already disabled 9
imx-ipuv3 imx-ipuv3.0: Channel already uninitialized 9
Console: switching to colour frame buffer device 100x30
imx-ipuv3 imx-ipuv3.0: Channel already disabled 10
imx-ipuv3 imx-ipuv3.0: Channel already uninitialized 10
mxc_sdc_fb mxc_sdc_fb.2: register mxc display driver ldb
mxc_sdc_fb mxc_sdc_fb.2: NO mxc display driver found!
mxc_sdc_fb mxc_sdc_fb.3: register mxc display driver ldb
mxc_sdc_fb mxc_sdc_fb.3: NO mxc display driver found!
imx-sdma imx-sdma: loaded firmware 1.1
imx-sdma imx-sdma: initialized
Serial: IMX driver
imx-uart.0: ttymxc0 at MMIO 0x2020000 (irq = 58) is a IMX
imx-uart.1: ttymxc1 at MMIO 0x21e8000 (irq = 59) is a IMX
console [ttymxc1] enabled, bootconsole disabled
console [ttymxc1] enabled, bootconsole disabled
loop: module loaded
mousedev: PS/2 mouse device common for all mice
snvs_rtc snvs_rtc.0: rtc core: registered snvs_rtc as rtc0
i2c /dev entries driver
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
mmc0: Unknown controller version (3). You may experience problems.
mmc0: SDHCI controller on platform [sdhci-esdhc-imx.3] using DMA
mmc1: Unknown controller version (3). You may experience problems.
mmc1: SDHCI controller on platform [sdhci-esdhc-imx.2] using DMA
sgtl5000 0-000a: Failed to get supply 'VDDD': -19
print_constraints: 0-000a: 850 <--> 1600 mV at 1200 mV normal
sgtl5000 0-000a: sgtl5000 revision 17
asoc: sgtl5000 <-> imx-ssi.1 mapping ok
ALSA device list:
#0: sgtl5000-audio
TCP cubic registered
NET: Registered protocol family 37
VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4
snvs_rtc snvs_rtc.0: setting system clock to 1970-01-01 00:00:00 UTC (0)
VFS: Cannot open root device "(null)" or unknown-block(0,0)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
CPU2: stopping
Function entered at [<80034544>] from [<8002a2c4>]
Function entered at [<8002a2c4>] from [<8002f60c>]
Exception stack(0xbffb3f90 to 0xbffb3fd8)
3f80: 8035d83c a0000093 bffb3fd8 00000000
3fa0: bffb2000 80344ac4 8035d464 80341a44 1000406a 412fc09a 00000000 00000000
3fc0: 00000000 bffb3fd8 8003040c 80030410 60000013 ffffffff
Function entered at [<8002f60c>] from [<80030410>]
Function entered at [<80030410>] from [<800309a0>]
Function entered at [<800309a0>] from [<1001f9b4>]
CPU0: stopping
Function entered at [<80034544>] from [<8002a2c4>]
Function entered at [<8002a2c4>] from [<8002f60c>]
Exception stack(0x80331f68 to 0x80331fb0)
1f60: 8035d83c a0000093 80331fb0 00000000 80330000 80344ac4
1f80: 8035d464 80341a44 1000406a 412fc09a 00000000 00000000 00000000 80331fb0
1fa0: 8003040c 80030410 60000013 ffffffff
Function entered at [<8002f60c>] from [<80030410>]
Function entered at [<80030410>] from [<800309a0>]
Function entered at [<800309a0>] from [<80008874>]
Function entered at [<80008874>] from [<1000803c>]
CPU1: stopping
Function entered at [<80034544>] from [<8002a2c4>]
Function entered at [<8002a2c4>] from [<8002f60c>]
Exception stack(0xbffabf90 to 0xbffabfd8)
bf80: 8035d83c a0000093 bffabfd8 00000000
bfa0: bffaa000 80344ac4 8035d464 80341a44 1000406a 412fc09a 00000000 00000000
bfc0: 00000000 bffabfd8 8003040c 80030410 60000013 ffffffff
Function entered at [<8002f60c>] from [<80030410>]
Function entered at [<80030410>] from [<800309a0>]
Function entered at [<800309a0>] from [<1001f9b4>]
')
....

And 6q_bootscript contains the following lines.

$this->bbcode_second_pass_code('', 'bootargs $bootargs console=ttymxc1,115200 vmalloc=400M root=/dev/mmcblk0p1 rootwait fixrtc consoleblank=0 ;
setenv bootargs $bootargs video=mxcfb0:dev=ldb,LDB-SVGA,if=RGB666 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off fbmem=10M
ext2load mmc ${disk}:1 10800000 /boot/uImage && bootm 10800000 ; echo "Error loading kernel image"')

Can anybody tell me what is the issue.

Regards,
Ashwath

[WarheadsSE]

1) you seem to have a problem finding your rootfs
2) you need to have fbconsole enabled.

[ashwath]

Hi,
Can you tell me the steps how it can be done.

root@freescale /sys/class/graphics/fb0$ cat fsl_disp_property
2-layer-fb-bg

Output of fsl_disp_property shows 2-layer-fb-bg. Is the above value is correct for LVDS Display configuration.

Regards
Ashwath

[WarheadsSE]

First, you need to get booted into the OS.

[ashwath]

Hi,
Can you suggest improved boot-args to be used in 6q_bootscript for Overcoming above-error.
Regards,
Ashwath

[WarheadsSE]

Well obviously, your rootfs= iis the problem, since it can't find it.

What are you trying to boot off of?
What is the filesystem format?

[ashwath]

Hi,
Well thanks for the answer. I am trying to boot- kernel with above boot-args, by setting the corresponding environment variable bootargs in the kernal command line. Final booting stage will be done by 6q_bootscript. My main concern here is to change the video= clause to LVDS configuration so that I can use LVDS display with nitrogen-6x board.
The file system used is ext2.
Regards,
Ashwath

[WarheadsSE]

If that is the exact copy & paste of your 6q_bootscript, you have a syntax error in it.

[ashwath]

Hi,
For your inforamtion with the attached 6q_bootscript I am able to boot the kernel with the same file system what-ever I am using here.. But I am not able to see anything on the display.

Regards,
Ashwath

[ashwath]

Hi,
Well ,ok thanks let me chack and get back to you in-case of issues.

Regards,
Ashwath