4.3 Inch LCD Display: Beagle Bone Black

General Discussion
1

Hello All,

I have a new waveshare LCD 4.3 inch. This I have connected to the Beagle Bone Black.
I am not able to see a Desktop GUI on the LCD Display. All I get is a white screen.

However, when I connect over to the laptop, I am able to see the Beagle Bone Black Desktop on the laptop screen on vnc.

While entering the command:
root@beaglebone:/# sudo /opt/scripts/tools/version.sh

Below is the result.
git:/opt/scripts/:[1aa73453b2c980b75e31e83dab7dd8b6696f10c7]
eeprom:[A335BNLT00C02818BBBK0E82]
model:[TI_AM335x_BeagleBone_Black]
dogtag:[BeagleBoard.org Debian Image 2018-10-07]
bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 2018.09-00002-g0b54a51eee]:[location: dd MBR]
bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2018.09-00002-g0b54a51eee]:[location: dd MBR]
kernel:[4.14.67+]
nodejs:[v6.14.4]
uboot_overlay_options:[enable_uboot_overlays=1]
uboot_overlay_options:[uboot_overlay_addr0=/lib/firmware/DVK530-LCD4-01-00A0.dtbo]
uboot_overlay_options:[disable_uboot_overlay_video=1]
uboot_overlay_options:[disable_uboot_overlay_audio=1]
uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-14-TI-00A0.dtbo]
uboot_overlay_options:[enable_uboot_cape_universal=1]
pkg check: to individually upgrade run: [sudo apt install --only-upgrade ]
pkg:[bb-cape-overlays]:[4.4.20180928.0-0rcnee0~stretch+20180928]
pkg:[bb-wl18xx-firmware]:[1.20180517-0rcnee0~stretch+20180517]
pkg:[kmod]:[23-2rcnee1~stretch+20171005]
pkg:[librobotcontrol]:[1.0.3-git20181005.0-0rcnee0~stretch+20181005]
pkg:[firmware-ti-connectivity]:[20170823-1rcnee1~stretch+20180328]
groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal i2c bluetooth netdev cloud9ide gpio pwm eqep admin spi tisdk weston-launch xenomai]
cmdline:[console=ttyO0,115200n8 capemgr.enable_partno=DVK530-LCD4-01:00A0 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet]
dmesg | grep pinctrl-single
[ 1.125155] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
dmesg | grep gpio-of-helper
[ 1.137322] gpio-of-helper ocp:cape-universal: ready
END

Please share any suggestions on how I can see a desktop environment on the 4.3 inch LCD display.

Regards
Anu

2

Did you try using the image that WaveShare says to use?

This looks to be a 4D Systems clone GEN4-4DCAPE-43CT-CLB | 4D Systems

I would recommend enabling the overlay for the 4.3 display. Which I use for the 4D systems display, it works perfect. https://raw.githubusercontent.com/beagleboard/bb.org-overlays/master/src/arm/BB-BONE-4D4C-01-00A1.dts

3

Thank you, when I try to compile the dts. I get the following error

Error: BB-BONE-4D4C-01-00A1.dts:10.1-9 syntax error
FATAL ERROR: Unable to parse input tree

Also, please note that when I run the following commands, the results are as follows.
debian@beaglebone:/$ sudo service lightdm start
[sudo] password for debian:
debian@beaglebone:/$ startlxde
** Message: main.vala:102: Session is LXDE
** Message: main.vala:103: DE is LXDE
** Message: main.vala:134: log directory: /home/debian/.cache/lxsession/LXDE
** Message: main.vala:135: log path: /home/debian/.cache/lxsession/LXDE/run.log

Regards
Anu

4

Hello,

Point 1:

I have difficulty in compiling the dts file as I get the below error:
I get the following error
Error: BB-BONE-4D4C-01-00A1.dts:10.1-9 syntax error
FATAL ERROR: Unable to parse input tree

Point 2:

I am able to get the beagle bone desktop on my laptop screen after running startlxde.
But the LCD display always shows white screen and no desktop GUI appears.
The LCD display I have connected is through a Waveshare LCD cape.

Please suggest a way to get the two points above to be addressed.

Thanking you,
Anu

5

Hello All,

As an update, I tried to do with another Beagle Bone Black unit and the LCD display showed the Beagle Bone Desktop. So this was mostly related to a Hardware Unit Issue.

Thank you
Anu

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