Dual Display setup on Yocto build

[paul_lee]

Hi,

I am using imx6q SABRE SDP hardware.

I have build fsl-image-gui and i want to display this on dual display.

Display 1 = HDMI 720p and Display 2 = LVDS = 1024 x720

My bootargs is a follow

imx6qsabresd login: printenv

baudrate=115200

boot_fdt=try

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

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

bootdelay=1

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

console=ttymxc0

ethact=FEC

ethaddr=00:04:9f:02:70:e0

ethprime=FEC

fdt_addr=0x18000000

fdt_file=imx6q-sabresd.dtb

fdt_high=0xffffffff

initrd_addr=0x12C00000

initrd_high=0xffffffff

ip_dyn=yes

loadaddr=0x12000000

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

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

loaduimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${uimage}

mfgtool_args=setenv bootargs console=ttymxc0,115200 rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.idVendor=0x066F g_mass_storage.idProduct=0x37FF g_mass_storage.iSerialNumber="" enable_wait_mode=off

mmcargs=setenv bootargs console=${console},${baudrate} ${smp} root=${mmcroot} video=mxcfb0:dev=hdmi,1280x720M@60,if=RGB24 video=mxcfb1:dev=ldb,LDB-XGA,if=RGB666 ldb=sin1 

mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootm ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootm; else echo WARN: Cannot load the DT; fi; fi; else bootm; fi;

mmcdev=1

mmcpart=1

mmcroot=/dev/mmcblk0p2 rootwait rw

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

But I am only getting display on HDMI...

Did i missed some thing?

What more modification is required to get dual display working?

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} ${uimage}; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if ${get_cmd} ${fdt_addr} ${fdt_file}; then bootm ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootm; else echo WARN: Cannot load the DT; fi; fi; else bootm; fi;

script=boot.scr

uimage=uImage

Environment size: 2103/8188 bytes

[Yuri]

  Assuming the recent (Yocto) BSP ; from Release Notes those are the possible / tested 

command lines:
  1. video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb1:dev=ldb,LDBXGA,if=RGB666

  2. video=mxcfb0:dev=ldb,LDBXGA,if=RGB666 video=mxcfb1:dev=hdmi,1920x1080M@60,if=RGB24

  3. video=mxcfb0:dev=lcd,CLAAWVGA,if=RGB656
  4. video=mxcfb0:dev=mipi_dsi,TRULYWVGA,if=RGB24

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

  6. video=mxcfb0:dev=ldb,LDBXGA,if=RGB666 None or ldb=sin0

  7. video=mxcfb0:dev=ldb,LDBXGA,if=RGB666 ldb=sep1

  8. video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24ldb=sep1

You may try the first case.

Have a great day,
Yuri

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[paul_lee]

Hi,

Yuri

I have tried with

editenv mmcargs

and added

"video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb1:dev=ldb,LDBXGA,if=RGB666"

I am able to get 1080p display on HDMI but there is no display on LVDS.

[paul_lee]

Hi,

if i run echo 0 > /sys/class/graphics/fb1/blank, than small overlay is created on my HDMI display.

[saurabh206]

Hello lee

echo 0 > /sys/class/graphics/fb2/blank

dd if=/dev/urandom of=/dev/fb2

Try to run above command and check display on secondary device.

Regards

Saurabh

[vongocson]

i've do that too, but my screen not show!

[paul_lee]

Now how to get mirror display in linux (HDMI + LVDS)?

[huang_dexiang]

Hi, Lee.

did you get miroor display in linux?

We have the same issues. We use Minigui as our UI system, and we want to display UI and play video on LVDS and HDMI at the same time.