Interfacing lcd to imx6dl sabre sd

I'm trying to bring up the imxdl sabresd board using a prebuilt image but the lcd which is interfaced to the board doesn't display anything. How do I set-environment for this?

I've followed the standard docs. which said: add

video=mxcfb0:dev=ldb,bpp=32

to the kernel command line Hence I tried: editenv mmcargs edit: setenv bootargs console=${console},${baudrate} ${smp} root=${mmcroot} video=mxcfb0:dev=ldb,bpp=32.

the u-boot environment setting is

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 ni
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootdelay=1
bootscript=echo Running bootscript from mmc ...; source
console=ttymxc0
emmcdev=2
epdc_waveform=epdc_splash.bin
ethact=FEC
ethaddr=00:04:9f:03:cf:03
ethprime=FEC
fdt_addr=0x18000000
fdt_file=imx6dl-sabresd.dtb
fdt_high=0xffffffff
image=zImage
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}
loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}
mfgtool_args=setenv bootargs console=ttymxc0,115200 rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.idVendor 
mmcargs=setenv bootargs console=${console},${baudrate} ${smp} root=${mmcroot} video=mxcfb0:dev=ldb,bpp=32
mmcautodetect=yes
mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadad;
mmcdev=2
mmcpart=1
mmcroot=/dev/mmcblk3p2 rootwait rw
netargs=setenv bootargs console=${console},${baudrate} ${smp} root=/dev/nfs ip=dhcp nfsroot=${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} $;
script=boot.scr
update_emmc_firmware=if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; if ${get_cmd} ${update_sd_firmware_filei
update_sd_firmware=if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; if mmc dev ${mmcdev}; then if ${get_cmd} i

I expect the "embeddedlogo" to pop up on the lcd while the kernel boots. However the lcd remains blank exept for the back light which gets turned on after the board boots. What other settings am I to do for the setenv/editenv?