AM625: How to add multiple device tree overlays in uboot

Hi below uEnv.txt file created and boot the board . but overlay getting issue. please find below error logs.

i found below config in <uboot_src>/board/ti/am62x/am62x.env

fyi , device tree overlays and device tree binary placed in SDCARD 2nd partiton (path : boot/dtb/ti/ )

# Set the default device tree
default_device_tree=ti/k3-am625-sk.dtb
  	
# Script to find and set the appropriate device tree
findfdt=echo "Reading from Tessolve uEnv.txt..."; setenv name_fdt ${default_device_tree}; \
    if test $board_name = am62x_skevm; then \
        setenv name_fdt ti/k3-am625-sk.dtb; \
    fi; \
    if test $board_name = am62x_lp_skevm; then \
        setenv name_fdt ti/k3-am62-lp-sk.dtb; \
    fi; \
    if test $board_name = am62x_beagleplay; then \
        setenv name_fdt ti/k3-am625-beagleplay.dtb; \
    fi; \
    setenv fdtfile ${name_fdt}
 
# Load the device tree and overlays
uenvcmd=run findfdt; \
    echo "Loading device tree: ${fdtfile}"; \
    load mmc 1:2 ${fdtaddr} /boot/dtb/${fdtfile}; \
    fdt addr ${fdtaddr}; \
    echo "Loading overlay 1: /board/dtb/ti/k3-am625-beagleplay-csi2-ov5640.dtbo"; \
    load mmc 1:2 0x89000000 /board/dtb/ti/k3-am625-beagleplay-csi2-ov5640.dtbo; \
    fdt apply 0x89000000; \
    echo "Overlay 1 applied."; \
    echo "Loading overlay 2: /board/dtb/ti/k3-am62x-sk-csi2-imx219.dtbo"; \
    load mmc 1:2 0x89000000 /board/dtb/ti/k3-am62x-sk-csi2-imx219.dtbo; \
    fdt apply 0x89000000; \
    echo "Overlay 2 applied."; \
    echo "Loading overlay 3: /board/dtb/ti/k3-am62x-sk-csi2-ov5640.dtbo"; \
    load mmc 1:2 0x89000000 /board/dtb/ti/k3-am62x-sk-csi2-ov5640.dtbo; \
    fdt apply 0x89000000; \
    echo "Overlay 3 applied."; \
    fdt resize

ERROR LOGS 

Loading overlay 1: /board/dtb/ti/k3-am625-beagleplay-csi2-ov5640.dtbo
Failed to load '/board/dtb/ti/k3-am625-beagleplay-csi2-ov5640.dtbo'
libfdt fdt_check_header(): FDT_ERR_BADMAGIC
Overlay 1 applied.

U-Boot 2023.04-ti-gf9b966c67473 (Mar 19 2024 - 20:31:40 +0000)

SoC:   AM62X SR1.0 GP
Model: Texas Instruments AM625 SK
EEPROM not available at 80, trying to read at 81
Reading on-board EEPROM at 0x51 failed -121
DRAM:  2 GiB
Core:  72 devices, 32 uclasses, devicetree: separate
MMC:   mmc@fa10000: 0, mmc@fa00000: 1
Loading Environment from nowhere... OK
In:    serial
Out:   serial
Err:   serial
EEPROM not available at 80, trying to read at 81
Reading on-board EEPROM at 0x51 failed -121
Net:   eth0: ethernet@8000000port@1
Hit any key to stop autoboot:  0 
i2c_write: error waiting for data ACK (status=0x116)
pca953x gpio@22: Error reading output register
switch to partitions #0, OK
mmc1 is current device
i2c_write: error waiting for data ACK (status=0x116)
pca953x gpio@22: Error reading output register
SD/MMC found on device 1
Failed to load 'boot.scr'
1488 bytes read in 16 ms (90.8 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc1 ...
Running uenvcmd ...
Reading from Tessolve uEnv.txt...
Loading device tree: ti/k3-am625-sk.dtb
60299 bytes read in 21 ms (2.7 MiB/s)
Working FDT set to 88000000
Loading overlay 1: /board/dtb/ti/k3-am625-beagleplay-csi2-ov5640.dtbo
Failed to load '/board/dtb/ti/k3-am625-beagleplay-csi2-ov5640.dtbo'
libfdt fdt_check_header(): FDT_ERR_BADMAGIC
Overlay 1 applied.
Loading overlay 2: /board/dtb/ti/k3-am62x-sk-csi2-imx219.dtbo
Failed to load '/board/dtb/ti/k3-am62x-sk-csi2-imx219.dtbo'
libfdt fdt_check_header(): FDT_ERR_BADMAGIC
Overlay 2 applied.
Loading overlay 3: /board/dtb/ti/k3-am62x-sk-csi2-ov5640.dtbo
Failed to load '/board/dtb/ti/k3-am62x-sk-csi2-ov5640.dtbo'
libfdt fdt_check_header(): FDT_ERR_BADMAGIC
Overlay 3 applied.
Reading from Tessolve uEnv.txt...
## Error: "main_cpsw0_qsgmii_phyinit" not defined
22034944 bytes read in 892 ms (23.6 MiB/s)
60299 bytes read in 21 ms (2.7 MiB/s)
Working FDT set to 88000000
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
Working FDT set to 88000000
   Loading Device Tree to 000000008feee000, end 000000008fffffff ... OK
Working FDT set to 8feee000

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
[    0.000000] Linux version 6.1.80-ti-g2e423244f8c0 (oe-user@oe-host) (aarch64-oe-linux-gcc (GCC) 11.4.0, GNU ld (GNU Binutils) 2.38.20220708) #1 SMP PREEMPT Wed Mar 20 14:43:33 UTC 2024
[    0.000000] Machine model: Texas Instruments AM625 SK TESS
[    0.000000] earlycon: ns16550a0 at MMIO32 0x0000000002800000 (options '')
[    0.000000] printk: bootconsole [ns16550a0] enabled
[    0.000000] efi: UEFI not found.

Note : I am using device tree overlays binaries which comes along with linux kernel 6.1 .

Kindly help me on this .

Thanks, Naresh

Hello Naresh, 

Can you apply the overlays from U-boot prompt using the command:

Hit any key to stop autoboot:  0
        =>
        => setenv name_overlays <name-of-overlay>.dtbo
        => boot

Regards,
Aparna

Hi Aparna ,

Thanks for response. 

with name_overlays its working fine , name overalys configured in which file in uboot source code ?

why i am not able to load device tree overlay with below 

# Load the device tree and overlays
uenvcmd=run findfdt; \
echo "Loading device tree: ${fdtfile}"; \
load mmc 1:2 ${fdtaddr} /boot/dtb/${fdtfile}; \
fdt addr ${fdtaddr}; \
echo "Loading overlay 1: /board/dtb/ti/k3-am625-beagleplay-csi2-ov5640.dtbo"; \
load mmc 1:2 0x89000000 /board/dtb/ti/k3-am625-beagleplay-csi2-ov5640.dtbo; \
fdt apply 0x89000000; \
echo "Overlay 1 applied."; \

Thanks, Naresh

HI Aparna,

Thanks, Naresh