Hello, I’m trying to modify kernel version 5.10.168-ti-r71 to enable OMAP driver instead of the 8250 driver so I can use ttyO* ports instead of ttyS* that comes with the existing kernel. I follow the download/compile/install steps outlined here: The Kernel — BeagleBoard Documentation while adding 2 changes to the .config file (outlined below) during compilation. When I boot the BeagleBone using this new image, it hangs at “Starting Kernel …”
Any help getting this to boot would be greatly appreciated.
Please find the boot log below and also other relevant info:
Hardware: BeagleBone Black Industrial
Image on SD card: AM335x 11.7 2023-09-02 4GB microSD IoT
Kernel being modified: 5.10.168-ti-r71
Steps to build kernel: The Kernel — BeagleBoard Documentation
Changes made in .config:
Device->Character devices->Serial drivers->Support for OMAP internal UART (8250 based driver)- disable
Device->Character devices->Serial drivers->OMAP serial port support- enable
Boot Log
U-Boot SPL 2022.04-ge0d31da5 (Aug 04 2023 - 18:48:26 +0000)
Trying to boot from MMC2
U-Boot 2022.04-ge0d31da5 (Aug 04 2023 - 18:48:26 +0000)
CPU : AM335X-GP rev 2.1
Model: TI AM335x BeagleBone Black
DRAM: 512 MiB
Reset Source: Power-on reset has occurred.
RTC 32KCLK Source: External.
Core: 150 devices, 14 uclasses, devicetree: separate
WDT: Started wdt@44e35000 with servicing (60s timeout)
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: no EEPROM at address: 0x54
BeagleBone Cape EEPROM: no EEPROM at address: 0x55
BeagleBone Cape EEPROM: no EEPROM at address: 0x56
BeagleBone Cape EEPROM: no EEPROM at address: 0x57
Net: eth2: ethernet@4a100000, eth3: usb_ether
Press SPACE to abort autoboot in 0 seconds
board_name=[A335BNLT] ...
board_rev=[00C0] ...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
Couldn't find partition 0:2 0x82000000
Can't set block device
Couldn't find partition 0:2 0x82000000
Can't set block device
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
libfdt fdt_check_header(): FDT_ERR_BADVERSION - too new, fdt 67371025 > 17
Scanning disk mmc@48060000.blk...
Scanning disk mmc@481d8000.blk...
Found 4 disks
No EFI system partition
BootOrder not defined
EFI boot manager: Cannot load any image
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/uEnv.txt ...
gpio: pin 55 (gpio 55) value is 1
1713 bytes read in 3 ms (557.6 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-5.10.168-ti-r71 ...
11338240 bytes read in 715 ms (15.1 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/5.10.168-ti-r71/am335x-boneblack-uboot-univ.dtb ...
210757 bytes read in 18 ms (11.2 MiB/s)
Found 0 extension board(s).
uboot_overlays: [fdt_buffer=0x60000] ...
uboot_overlays: loading /boot/dtbs/5.10.168-ti-r71/overlays/BB-ADC-00A0.dtbo ...
645 bytes read in 4 ms (157.2 KiB/s)
uboot_overlays: loading /boot/dtbs/5.10.168-ti-r71/overlays/BB-BONE-eMMC1-01-00A0.dtbo ...
1605 bytes read in 4 ms (391.6 KiB/s)
uboot_overlays: loading /boot/dtbs/5.10.168-ti-r71/overlays/BB-HDMI-TDA998x-00A0.dtbo ...
5321 bytes read in 5 ms (1 MiB/s)
loading /boot/initrd.img-5.10.168-ti-r71 ...
8077462 bytes read in 516 ms (14.9 MiB/s)
debug: [console=ttyS0,115200n8 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=100 quiet] ...
debug: [bootz 0x82000000 0x88080000:7b4096 88000000] ...
Kernel image @ 0x82000000 [ 0x000000 - 0xad0200 ]
## Flattened Device Tree blob at 88000000
Booting using the fdt blob at 0x88000000
Loading Ramdisk to 8f84b000, end 8ffff096 ... OK
Loading Device Tree to 8f7b3000, end 8f84afff ... OK
Starting kernel ...
uEnv.txt
#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0
uname_r=5.10.168-ti-r71
#uuid=
#dtb=
###U-Boot Overlays###
###Documentation: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays
###Master Enable
enable_uboot_overlays=1
###
###Overide capes with eeprom
#uboot_overlay_addr0=<file0>.dtbo
#uboot_overlay_addr1=<file1>.dtbo
#uboot_overlay_addr2=<file2>.dtbo
#uboot_overlay_addr3=<file3>.dtbo
###
###Additional custom capes
#uboot_overlay_addr4=<file4>.dtbo
#uboot_overlay_addr5=<file5>.dtbo
#uboot_overlay_addr6=<file6>.dtbo
#uboot_overlay_addr7=<file7>.dtbo
###
###Custom Cape
#dtb_overlay=<file8>.dtbo
###
###Disable auto loading of virtual capes (emmc/video/wireless/adc)
#disable_uboot_overlay_emmc=1
#disable_uboot_overlay_video=1
#disable_uboot_overlay_audio=1
#disable_uboot_overlay_wireless=1
#disable_uboot_overlay_adc=1
###
###Cape Universal Enable
enable_uboot_cape_universal=1
###
###Debug: disable uboot autoload of Cape
#disable_uboot_overlay_addr0=1
#disable_uboot_overlay_addr1=1
#disable_uboot_overlay_addr2=1
#disable_uboot_overlay_addr3=1
###
###U-Boot fdt tweaks... (60000 = 384KB)
#uboot_fdt_buffer=0x60000
###U-Boot Overlays###
console=ttyS0,115200n8
cmdline=coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=100 quiet
#In the event of edid real failures, uncomment this next line:
#cmdline=coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=100 quiet video=HDMI-A-1:1024x768@60e
#Use an overlayfs on top of a read-only root filesystem:
#cmdline=coherent_pool=1M net.ifnames=0 lpj=1990656 rng_core.default_quality=100 quiet overlayroot=tmpfs
##enable Generic eMMC Flasher:
#cmdline=init=/usr/sbin/init-beagle-flasher
