Change screen resolution Android 4.2.2 KitKat on Beaglebone black.

hoseong son

Prodigy 160 points

Other Parts Discussed in Thread: DA8XX

I wanna change screen resolution 800x480 or similer value.

How can i change screen resolution Android 4.2.2 KitKat on Beaglebone black?

over 9 years ago

0 hoseong son over 9 years ago

Prodigy 160 points

sorry. it's not kitkat. it's jb

0 Adeneo Embedded support team over 9 years ago

Mastermind 9310 points

Hello,

Can you give us more details on the type of screen you are using? Is it with the HDMI out or with a cape?

If it is a cape, during the boot, you should see a string looking like this: "da8xx_lcdc da8xx_lcdc.0: GLCD: Found XYZ panel", corresponding to the cape the Beaglebone Black found.
Now open "drivers/video/da8xx-fb.c", and search the "XYZ" reference inside this file: you should find an element inside the structure "da8xx_panel known_lcd_panels", which contains all known LCD panels. You need to change the ".width" and ".height" values (maybe other values, depending on your screen specification), and recompile your kernel.

If you are using HDMI, you can check this link: elinux.org/Beagleboard:BeagleBoneBlack_HDMI

0 hoseong son over 9 years ago in reply to Adeneo Embedded support team

Prodigy 160 points

Thank you.

My Display is 7' HDMI touch screen.

I'm gonna try solutions in link!

0 hoseong son over 9 years ago in reply to Adeneo Embedded support team

Prodigy 160 points

Is it possible in Android?

I did solution in "Forcing A Resolution" Section but echos "no search or directory" when i type "export XAUTHORITY=`ls /var/run/gdm/auth-for-root-*/database`"

0 Adeneo Embedded support team over 9 years ago in reply to hoseong son

Mastermind 9310 points

Hello,

Can you try this solution? By default Android will read the EDID to boot with the highest possible resolution.
elinux.org/Beagleboard:Android

0 hoseong son over 9 years ago in reply to Adeneo Embedded support team

Prodigy 160 points

I wanna use "BBB_JB_Android_3_8_13.img" in your link, but if i flash it on my SD , NO SCREEN DISPLAYED on my LCD or monitor.
so i use TI_Android_JB_4.2.2_Devkit image. (use .sh to flash this image).
in your link, to change resolution is so easy. so i WANT TO USE it if i solve NO SCREEN DISPLAYED problem.

Do you know why it isn't displayed? if not, i must find way to change screen resolution on my current android image

0 Adeneo Embedded support team over 9 years ago in reply to hoseong son

Mastermind 9310 points

Hello,

You don't need to flash the BBB_JB_Android_3_8_13.img, the image from TI_Android_JB_4.2.2_Devkit works fine.
Once you flashed the TI_Android_JB_4.2.2_Devkit image, you will have 4 partitions on your SD card.
One of them will contains those files: uImage, uEnv.txt, u-boot.img, MLO, ...

uEnv.txt contains some variables that u-boot (the bootloader) will read before starting the kernel.
You want to open this file, and append to the 'bootargs' variable's line the resolution you want.

This is the line by default:
bootargs=console=ttyO0,115200n8 androidboot.console=ttyO0 mem=512M root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait init=/init ip=off

This is an example of what you want:
bootargs=console=ttyO0,115200n8 androidboot.console=ttyO0 mem=512M root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait init=/init ip=off video=1280x720-16@60

0 hoseong son over 9 years ago in reply to Adeneo Embedded support team

Prodigy 160 points

thank you. i try again....

and 800x480-16@60 is also possible?

0 hoseong son over 9 years ago in reply to Adeneo Embedded support team

Prodigy 160 points

i modified as 800x480-16@60 but it dosen't changed...

0 hoseong son over 9 years ago in reply to Adeneo Embedded support team

Prodigy 160 points

Dose it related with connection 7inch HDMI LCD?

in my thinking, connected HDMI LCD sets screen resolution...

i don't change uEnv.txt but screen size always 1280x720.

if it dose, i want to change size to 800x480.

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Change screen resolution Android 4.2.2 KitKat on Beaglebone black.