KitKat 4.4.3 LVDS change not working

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KitKat 4.4.3 LVDS change not working

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gap
Contributor III

Hi, we have downloaded the Adroid 4.4.3 Kitkat SABRE Platform and SABRE Board for Smart Devices Demo Image and it works fine on our MCIMX6Q-SDP 27392 REV C4 development unit with lvds display 1024x768. We now want to get it working with a 1280x800 LVDS display. Can anyone tell me what I have to change for this? We will also want to get it working on our MCIMX6Q-SDB 27516 REV C2 dev board.

Current uboot environment:

=> printenv
baudrate=115200
bootcmd=booti mmc1
bootdelay=3
ethact=FEC
ethaddr=00:04:9f:02:6d:60
ethprime=FEC
fastboot_dev=mmc1
fdt_high=0xffffffff
initrd_high=0xffffffff
loadaddr=0x12000000
splashpos=m,m

Environment size: 215/8188 bytes

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SergioSolis
NXP Employee
NXP Employee

Hello Graeme,

Are you seeing anything on the screen at any point?

Did you change the booting arguments to set the new resolution?

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gap
Contributor III

Hello Sergio, We did try changing the bootargs to this: console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,1280x800M@61,if=R   GB666 video=mxcfb1:off video=mxcfb2:off fbmem=28M vmalloc=400M androidboot.console=ttymxc0 androidboot.hardware=freescale

This worked with an older version of android but not with the 4.3.3 version.

We don't see anything on the screen at all.

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EricNelson
Senior Contributor II

Hi Graeme,

The LDB subsystem has been refactored in the 3.10.53 kernel and VESA GTF mode strings are no longer functional.


You can specify the timings in the device tree, as shown in this patch for our SABRE Lite board.

     https://github.com/boundarydevices/linux-imx6/commit/91d61b4

123 Views
gap
Contributor III

Hi Eric,

Thanks for your help, I have passed this on to our software developer who will hopefully test this in the next few days.

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