AnsweredAssumed Answered

No output from LVDS

Question asked by 超超 徐 on Aug 3, 2016
Latest reply on Aug 3, 2016 by 超超 徐

I use u-boot 2016.03 and ubuntu Image(kernel 3.14.52), I want to use LVDS as default video output, I set the u-boot variable setenv bootargs_mmc 'setenv bootargs ${bootargs} root=/dev/mmcblk1p1 rootwait rw video=mxcfb0:dev=ldb, LDB-XGA,1024x768M@60,if=RGB666'. The LVDS panel backlight flick several times then stoped. The video is always output from HDMI. Could you tell me how to set the LVDS as default output?

Below is my environment parameters:

Hit any key to stop autoboot:  0

=> printenv

active_partition=1

baudrate=115200

board=sabrelite

bootargs=cpu= board=

bootargs_mmc=setenv bootargs ${bootargs} root=/dev/mmcblk1p1 rootwait rw video=mxcfb0:dev=ldb,LDB-XGA,ldb=sin1,1024x768M@60,if=RGB666

bootcmd=script=/6x_bootscript;run runscript;setenv stdout serial,vga; echo ; echo 6x_bootscript not found ; echo ; echo serial console at 115200, 8N1 ; echo ; echo detai;

bootdelay=3

bootdevs=sata mmc usb

clearenv=if sf probe || sf probe ; then sf erase 0xc0000 0x2000 && echo restored environment to factory default ; fi

cmd_hdmi=fdt set fb_hdmi status okay;fdt set fb_hdmi mode_str 1280x720M@60;

cmd_lcd=fdt set fb_lcd status disabled

cmd_lvds=fdt set fb_lvds status okay;fdt set fb_lvds mode_str hannstart7;

console=ttymxc1

cpu=6Q

dfu_alt_info=u-boot raw 0x0 0xc0000

eth1addr=00:19:b8:00:00:02

ethact=FEC

ethprime=FEC

fb_lvds=hannstart7

fb_lvds2=hannstar

fdt_addr=13000000

fdt_high=0xffffffff

fileaddr=10008000

filesize=1155

initrd_high=0xffffffff

loadaddr=0x12000000

loadsplash=if sf probe ; then sf read ${splashimage} ${splashflash} ${splashsize} ; fi

mmc_disks=0 1

mmc_ums_disks=0 1

net_upgradeu=dhcp 10008000 net_upgradeu && source 10008000

otg_upgradeu=run usbnetwork; tftp 10008000 net_upgradeu && source 10008000

reset_cause=1

rundfu=dfu 0 sf 0:0:25000000:0

runscript=for dtype in ${bootdevs}; do if itest.s usb == ${dtype} ; then usb start ;fi; disks=${mmc_disks};if itest.s mmc != ${dtype} ; then disks=0;fi; for disk in ${di;

sfname=SST25VF016B

splashflash=c2000

stdin=serial,usbkbd

stdout=serial,vga

uboot_defconfig=nitrogen6q

umsdevs=sata mmc

upgradeu=script=/6x_upgrade; run runscript

usbnet_devaddr=00:19:b8:00:00:02

usbnet_hostaddr=00:19:b8:00:00:01

usbnetwork=setenv ethact usb_ether; setenv ipaddr 10.0.0.2; setenv netmask 255.255.255.0; setenv serverip 10.0.0.1;

usbrecover=run usbnetwork;setenv bootargs console=${console},115200; tftpboot 10800000 10.0.0.1:uImage-${board}-recovery && tftpboot 12800000 10.0.0.1:uramdisk-${board}-0

 

Environment size: 2673/8188 bytes

Outcomes