Screen not working, my BBB thinks to be a BBG

General Discussion
1

Hi,
I have a problem with a BeagleBone Black, it thinks to be a BBGreen and the screen HDMI does not work. I found this page and tried to apply the proposed cure, without luck.

#> dd if=/opt/scripts/device/bone/bbb-eeprom.dump of=/sys/devices/platform/ocp/44e0b000.i2c/i2c-0/0-0050/eeprom

I am booting the same image via SDcard on two BBBlack, on one the screen works, on the other it does not. I post below the boot messages, first the messages from the BBB that thinkgs to be a BBGreen, and where screen does not work (No Signal).

Do you know how to fix this ?


U-Boot 2019.04-00002-g07d5700e21 (Mar 06 2020 - 11:24:55 -0600), Build: jenkins-github_Bootloader-Builder-137

CPU  : AM335X-GP rev 2.1
I2C:   ready
DRAM:  512 MiB
No match for driver 'omap_hsmmc'
No match for driver 'omap_hsmmc'
Some drivers were not found
Reset Source: Power-on reset has occurred.
RTC 32KCLK Source: External.
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from EXT4... ** File not found /boot/uboot.env **

** Unable to read "/boot/uboot.env" from mmc0:1 **
Board: BeagleBone Black
<ethaddr> not set. Validating first E-fuse MAC
BeagleBone Black:
Model: SeeedStudio BeagleBone Green:
BeagleBone: cape eeprom: i2c_probe: 0x54:
BeagleBone: cape eeprom: i2c_probe: 0x55:
BeagleBone: cape eeprom: i2c_probe: 0x56:
BeagleBone: cape eeprom: i2c_probe: 0x57:
Net:   eth0: MII MODE
cpsw, usb_ether
Press SPACE to abort autoboot in 0 seconds
board_name=[BBG1] ...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
gpio: pin 56 (gpio 56) value is 0
gpio: pin 55 (gpio 55) value is 0
gpio: pin 54 (gpio 54) value is 0
gpio: pin 53 (gpio 53) value is 1
switch to partitions #0, OK
mmc0 is current device
gpio: pin 54 (gpio 54) value is 1
Checking for: /uEnv.txt ...
Checking for: /boot.scr ...
Checking for: /boot/boot.scr ...
Checking for: /boot/uEnv.txt ...
gpio: pin 55 (gpio 55) value is 1
2062 bytes read in 35 ms (56.6 KiB/s)
Loaded environment from /boot/uEnv.txt
Checking if uname_r is set in /boot/uEnv.txt...
gpio: pin 56 (gpio 56) value is 1
Running uname_boot ...
loading /boot/vmlinuz-4.19.94-ti-r42 ...
10095592 bytes read in 665 ms (14.5 MiB/s)
debug: [enable_uboot_overlays=1] ...
debug: [enable_uboot_cape_universal=1] ...
debug: [uboot_base_dtb_univ=am335x-boneblack-uboot-univ.dtb] ...
uboot_overlays: [uboot_base_dtb=am335x-boneblack-uboot-univ.dtb] ...
uboot_overlays: Switching too: dtb=am335x-boneblack-uboot-univ.dtb ...
loading /boot/dtbs/4.19.94-ti-r42/am335x-boneblack-uboot-univ.dtb ...
162266 bytes read in 111 ms (1.4 MiB/s)
uboot_overlays: [fdt_buffer=0x60000] ...
uboot_overlays: loading /lib/firmware/M-BB-BBG-00A0.dtbo ...
423 bytes read in 229 ms (1000 Bytes/s)
uboot_overlays: loading /lib/firmware/BB-ADC-00A0.dtbo ...
867 bytes read in 33 ms (25.4 KiB/s)
uboot_overlays: loading /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo ...
1584 bytes read in 238 ms (5.9 KiB/s)
uboot_overlays: loading /lib/firmware/AM335X-PRU-RPROC-4-19-TI-00A0.dtbo ...
3801 bytes read in 209 ms (17.6 KiB/s)
loading /boot/initrd.img-4.19.94-ti-r42 ...
6585227 bytes read in 448 ms (14 MiB/s)
debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=10.
debug: [bootz 0x82000000 0x88080000:647b8b 88000000] ...
## Flattened Device Tree blob at 88000000
  Booting using the fdt blob at 0x88000000
  Loading Ramdisk to 8f9b8000, end 8ffffb8b ... OK
  Loading Device Tree to 8f92d000, end 8f9b7fff ... OK

Starting kernel ...

[    0.002127] timer_probe: no matching timers found
[    0.191028] l4_wkup_cm:clk:0010:0: failed to disable
[    1.480440] omap_voltage_late_init: Voltage driver support not added

Debian GNU/Linux 10 beaglebone ttyS0

BeagleBoard.org Debian Buster Console Image 2020-04-06

Support: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian

default username:password is [debian:temppwd]

for comparison, here the BBB who knows that it is a BBB


U-Boot 2019.04-00002-g07d5700e21 (Mar 06 2020 - 11:24:55 -0600), Build: jenkins-github_Bootloader-Builder-137

CPU  : AM335X-GP rev 2.1
I2C:   ready
DRAM:  512 MiB
No match for driver 'omap_hsmmc'
No match for driver 'omap_hsmmc'
Some drivers were not found
Reset Source: Power-on reset has occurred.
RTC 32KCLK Source: External.
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from EXT4... ** File not found /boot/uboot.env **

** Unable to read "/boot/uboot.env" from mmc0:1 **
Board: BeagleBone Black
<ethaddr> not set. Validating first E-fuse MAC
BeagleBone Black:
BeagleBone: cape eeprom: i2c_probe: 0x54:
BeagleBone: cape eeprom: i2c_probe: 0x55:
BeagleBone: cape eeprom: i2c_probe: 0x56:
BeagleBone: cape eeprom: i2c_probe: 0x57:
Net:   eth0: MII MODE
cpsw, usb_ether
Press SPACE to abort autoboot in 0 seconds
board_name=[A335BNLT] ...
board_rev=[000C] ...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
gpio: pin 56 (gpio 56) value is 0
gpio: pin 55 (gpio 55) value is 0
gpio: pin 54 (gpio 54) value is 0
gpio: pin 53 (gpio 53) value is 1
switch to partitions #0, OK
mmc0 is current device
gpio: pin 54 (gpio 54) value is 1
Checking for: /uEnv.txt ...
Checking for: /boot.scr ...
Checking for: /boot/boot.scr ...
Checking for: /boot/uEnv.txt ...
gpio: pin 55 (gpio 55) value is 1
2062 bytes read in 35 ms (56.6 KiB/s)
Loaded environment from /boot/uEnv.txt
Checking if uname_r is set in /boot/uEnv.txt...
gpio: pin 56 (gpio 56) value is 1
Running uname_boot ...
loading /boot/vmlinuz-4.19.94-ti-r42 ...
10095592 bytes read in 665 ms (14.5 MiB/s)
debug: [enable_uboot_overlays=1] ...
debug: [enable_uboot_cape_universal=1] ...
debug: [uboot_base_dtb_univ=am335x-boneblack-uboot-univ.dtb] ...
uboot_overlays: [uboot_base_dtb=am335x-boneblack-uboot-univ.dtb] ...
uboot_overlays: Switching too: dtb=am335x-boneblack-uboot-univ.dtb ...
loading /boot/dtbs/4.19.94-ti-r42/am335x-boneblack-uboot-univ.dtb ...
162266 bytes read in 111 ms (1.4 MiB/s)
uboot_overlays: [fdt_buffer=0x60000] ...
uboot_overlays: loading /lib/firmware/BB-ADC-00A0.dtbo ...
867 bytes read in 33 ms (25.4 KiB/s)
uboot_overlays: loading /lib/firmware/BB-BONE-eMMC1-01-00A0.dtbo ...
1584 bytes read in 238 ms (5.9 KiB/s)
uboot_overlays: loading /lib/firmware/BB-HDMI-TDA998x-00A0.dtbo ...
4915 bytes read in 256 ms (18.6 KiB/s)
uboot_overlays: loading /lib/firmware/AM335X-PRU-RPROC-4-19-TI-00A0.dtbo ...
3801 bytes read in 209 ms (17.6 KiB/s)
loading /boot/initrd.img-4.19.94-ti-r42 ...
6585227 bytes read in 449 ms (14 MiB/s)
debug: [console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=10.
debug: [bootz 0x82000000 0x88080000:647b8b 88000000] ...
## Flattened Device Tree blob at 88000000
  Booting using the fdt blob at 0x88000000
  Loading Ramdisk to 8f9b8000, end 8ffffb8b ... OK
  Loading Device Tree to 8f92c000, end 8f9b7fff ... OK

Starting kernel ...

[    0.002165] timer_probe: no matching timers found
[    0.195742] l4_wkup_cm:clk:0010:0: failed to disable
[    1.411336] omap_voltage_late_init: Voltage driver support not added

Debian GNU/Linux 10 beaglebone ttyS0

BeagleBoard.org Debian Buster Console Image 2020-04-06

Support: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian

default username:password is [debian:temppwd]
2

Yeap it thinks it’s a Green, just need to reprogram the eeprom…

First find TP4, it’s (it’s between ethernet and barrel plug), connect it to Ground, this is the eeprom Write Protect pin…

Next, as root run:

dd if=/opt/scripts/device/bone/bbb-eeprom.dump of=/sys/devices/platform/ocp/44e0b000.i2c/i2c-0/0-0050/eeprom

In some newer systems, 0-0050 → 0-0051 don’t ask, kernel is being weird…

Regards,

2 Likes
3

Thank you very much Robert ! My mistake was that i overlooked to connect TP4 with ground. The address that worked was just 0-0050.
bye