HDMI output on i.MX6 SABRE-SD

michaelworster · ‎12-01-2015

I'm trying to get some output over the HDMI from my SABRE board but I'm not getting anything. I'm using a standard HDMI cable connected to a SAMSUNG HDMI monitor, no converters, and I've verified the monitor and the cable work just fine via another input source.

I'm using a 6SX SABRE SDB board... either rev C (SCH-27962 REV C) or A2 (700-27962 REV A2), there's two stickers on the back. On the LCD expansion port (J11) I've connected a Freescale HDMI Port Card (SCH-26673 REVC3/700-26673 REV F).

All the connections seem sound, but I never see anything on the display. I've built both the fsl-image-gui and the fsl-image-qt5 image (with framebuffer backend) but neither seem to output anything. I did some searching and thought it might be a problem with the boot args, another thread got me thinking about that, I tried updating my boot arguments to:

setenv mmcargs 'setenv bootargs console=${console},${baudrate} root=/dev/mmcblk2p2 rootwait rw video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24'

but still no luck. How should I go about figuring out this issue? any thoughts?

michaelworster · ‎12-17-2015

The final solution to get HDMI out of the MCIMXHDMICARD with the SoloX SDB board was a combination of environment variables in u-boot being set correctly and a new kernel version. First an upgrade of the base software version to the 3.14.38 branch:

repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.14.38-6UL_ga

Then I used that to build the fsl-image-gui for the solox sabre sd board, and at the bootloader I had to initialize the previously mentioned variables:

setenv fdt_file 'imx6sx-sdb-lcdif1.dtb'

setenv mmcargs 'setenv bootargs console=${console},${baudrate} root=${mmcroot} video=${video}'

setenv panel 'MCIMX28LCD'

setenv video 'mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24'

Finally I was able to boot and get video out of the HDMI. I'm not having the same issue with a static root prompt that I noted in a different thread:
GUI on the fsl-image-gui build

But at least the video is working.

View solution in original post

chenghaibo · ‎12-17-2015

repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.14.38-6UL_ga

can you test it at i.MX6 Quad SABRE board? i have build it several times , the hdmi i's not works

michaelworster · ‎12-17-2015

The final solution to get HDMI out of the MCIMXHDMICARD with the SoloX SDB board was a combination of environment variables in u-boot being set correctly and a new kernel version. First an upgrade of the base software version to the 3.14.38 branch:

repo init -u git://git.freescale.com/imx/fsl-arm-yocto-bsp.git -b imx-3.14.38-6UL_ga

Then I used that to build the fsl-image-gui for the solox sabre sd board, and at the bootloader I had to initialize the previously mentioned variables:

setenv fdt_file 'imx6sx-sdb-lcdif1.dtb'

setenv mmcargs 'setenv bootargs console=${console},${baudrate} root=${mmcroot} video=${video}'

setenv panel 'MCIMX28LCD'

setenv video 'mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24'

Finally I was able to boot and get video out of the HDMI. I'm not having the same issue with a static root prompt that I noted in a different thread:
GUI on the fsl-image-gui build

But at least the video is working.

michaelworster · ‎12-09-2015

Another interesting point. I just got a i.MX6 Quad SABRE board (with embedded HDMI). I used the exact same setup (HDMI cable, monitor, linux/bootloader version, SD card) bootloader args. And everything works fine on that board.

To clarify, using the same version of the software I made a new build directory with:

MACHINE=imx6qsabresd source fsl-setup-release.sh –b build-qsaber-fb –e fb

bitbake fsl-image-gui

Instead of my original:

MACHINE=imx6sxsabresd source fsl-setup-release.sh –b build-qsaber-fb –e fb

bitbake fsl-image-gui

Then I loaded the .sdcard image to the SD card. I had to set one environment variable on my Quad board:

setenv video 'mxcfb0:dev=hdmi,1920x1080M@60,bpp=32'

setenv mmcargs 'setenv bootargs console=${console},${baudrate} video=${video} root=${mmcroot}'

Then when I booted the board I got output out of the HDMI from the Quad board and I saw the "Yocto" boot progress bar on the screen. When I do the EXACT SAME set of steps (except configuring for the SoloX) on the SoloX board, I do not see any output from the HDMI.

gururaghavendra · ‎05-17-2018

Hi Michel,

I tried the above command and can see that HDMI screen is up. but the gui is not fitting to the screen correctly.

i am using Lilliput 8"-inch lilliput display and Imx6qp sabre-sd board.

Regards,

Guru V

igorpadykov · ‎12-02-2015

Hi Michael

this card was used for i.MX53, usage with i.MX6SX is described on

https://community.freescale.com/thread/353083

https://community.freescale.com/message/363791#363791

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

michaelworster · ‎12-03-2015

I also missed one possible option for the "video" setting which I've now tried, but with the same lack of success:

video=mxcdi0fb:RGB24,1920x1080M@60 hdmi di0_primary

michaelworster · ‎12-03-2015

Hi Igor,

Good links, but it doesn't seem to be helping with the exception of gathering more data. It's correct that like the first link I'm also trying to get a MCIMXHDMICARD to work on a i.MX6 Solo X SABRE board, and I was using the same kernel version and initially loading the same device tree as that user, but adding the additional environment variables into my bootloader set up didn't seem to help. Here's some excerpts from my bootlog:

Bootloader Environment:

=> printenv

baudrate=115200

boot_fdt=try

bootcmd=mmc dev ${mmcdev};if mmc rescan; then if run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot; else run netboot; fi; fi; else run neti

bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};

bootdelay=3

bootscript=echo Running bootscript from mmc ...; source

console=ttymxc0

ethact=FEC0

ethaddr=00:04:9f:03:89:1c

ethprime=FEC

fdt_addr=0x83000000

fdt_file=imx6sx-sdb-lcdif1.dtb

fdt_high=0xffffffff

image=zImage

initrd_addr=0x83800000

initrd_high=0xffffffff

ip_dyn=yes

loadaddr=0x80800000

loadbootscript=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};

loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}

loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}

loadm4image=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${m4image}

m4boot=sf probe 1:0; bootaux 0x78000000

m4image=m4_qspi.bin

mfgtool_args=setenv bootargs console=${console},${baudrate} rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.idVendor=0x066F g_mass_stora

mmcargs=setenv bootargs console=${console},${baudrate} root=${mmcroot} video=${video}

mmcautodetect=yes

mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdt_addr}; else if t;

mmcdev=2

mmcpart=1

mmcroot=/dev/mmcblk3p2 rootwait rw

netargs=setenv bootargs console=${console},${baudrate} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp

netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} ${image}; if test ${boot_fdt};

panel=MCIMX28LCD

script=boot.scr

update_m4_from_sd=if sf probe 1:0; then if run loadm4image; then setexpr fw_sz ${filesize} + 0xffff; setexpr fw_sz ${fw_sz} / 0x10000; setexpr fw_sz ${fw_sz} * 0x10000; i

video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24

Environment size: 2444/8188 bytes

So there you can see I've set the "panel", "fdt_file", and "video" as requested. For video that was my second attempt, I tried the noted: "video=mxc_lcdif:SEIKO-WVGA,bpp=16" but that didn't work either and I think that's incorrect for the HDMI anyway.

=> boot

mmc2 is current device

reading boot.scr

** Unable to read file boot.scr **

reading zImage

5545424 bytes read in 256 ms (20.7 MiB/s)

Booting from mmc ...

reading imx6sx-sdb-lcdif1.dtb

48947 bytes read in 19 ms (2.5 MiB/s)

Kernel image @ 0x80800000 [ 0x000000 - 0x549dd0 ]

## Flattened Device Tree blob at 83000000

Booting using the fdt blob at 0x83000000

Using Device Tree in place at 83000000, end 8300ef32

switch to ldo_bypass mode!

Here in the boot command you can see it found and is reading the correct dtb file. Then below in the boot log you can see the command line I set as well as the linux version I'm using:

Starting kernel ...

Booting Linux on physical CPU 0x0

Linux version 3.10.53-1.1.0_ga+g496fbe0 (jenkins@scmbl1) (gcc version 4.8.2 (GCC) ) #1 SMP PREEMPT Mon Jan 5 15:55:14 CST 2015

CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d

CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache

Machine: Freescale i.MX6 SoloX (Device Tree), model: Freescale i.MX6 SoloX SDB Board

cma: CMA: reserved 320 MiB at ac000000

Memory policy: ECC disabled, Data cache writealloc

PERCPU: Embedded 8 pages/cpu @81598000 s8960 r8192 d15616 u32768

Built 1 zonelists in Zone order, mobility grouping on. Total pages: 260096

Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk3p2 rootwait rw video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24

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: 1024MB = 1024MB total

Memory: 697256k/697256k available, 351320k reserved, 0K highmem

Nothing more interesting in the boot of the kernel, but here after the boot finishes you can see the command line, uname, dmesg (searching for any HDMI messages), also loaded device drivers and framebuffer information:

Stopping Bootlog daemon: bootlogd.

Poky (Yocto Project Reference Distro) 1.6.2 imx6sxsabresd /dev/ttymxc0

imx6sxsabresd login: root

root@imx6sxsabresd:~# cat /proc/cmdline

console=ttymxc0,115200 root=/dev/mmcblk3p2 rootwait rw video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24

root@imx6sxsabresd:~#

root@imx6sxsabresd:~# uname -a

Linux imx6sxsabresd 3.10.53-1.1.0_ga+g496fbe0 #1 SMP PREEMPT Mon Jan 5 15:55:14 CST 2015 armv7l GNU/Linux

root@imx6sxsabresd:~#

root@imx6sxsabresd:~# dmesg | grep "hdmi"

[ 0.000000] Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk3p2 rootwait rw video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24

root@imx6sxsabresd:~#

root@imx6sxsabresd:~# fbset -i

mode "800x480-60"

# D: 33.501 MHz, H: 31.515 kHz, V: 60.259 Hz

geometry 800 480 800 480 16

timings 29850 89 164 23 10 10 10

rgba 5/11,6/5,5/0,0/0

endmode

Frame buffer device information:

Name : mxs-lcdif0

Address : 0xb4600000

Size : 8358400

Type : PACKED PIXELS

Visual : TRUECOLOR

XPanStep : 0

YPanStep : 1

YWrapStep : 0

LineLength : 1600

Accelerator : No

root@imx6sxsabresd:~#

root@imx6sxsabresd:~# cat /sys/class/graphics/fb

fb0/ fb1/ fbcon/

root@imx6sxsabresd:~# cat /sys/class/graphics/fb0/modes

U:800x480p-60

root@imx6sxsabresd:~# cat /sys/class/graphics/fb1/modes

U:1024x768p-60

root@imx6sxsabresd:~#

root@imx6sxsabresd:~# lsmod

Module Size Used by

ov5642_camera 75119 0

mxc_vadc_tvin 6408 0

mxc_dcic 5334 0

ov5640_camera 17959 0

evbug 1476 0

csi_v4l2_capture 17745 1

fsl_csi 5380 1 csi_v4l2_capture

In here it's interesting that fbset is telling me that it's 800x480p-60 so clearly it's using fb0. Seems that the video option isn't setting anything for the framebuffer.

HDMI output on i.MX6 SABRE-SD

HDMI output on i.MX6 SABRE-SD

Graphics & Display

i.MX6SoloX

Linux