Warm greetings to the community,
Need some serious help regarding booting FIT images on RPi4. I am working with a custom kernel and rootfs image for RPi4. Have cloned this repo - git clone https://gitlab.denx.de/u-boot/u-boot.git And generated u-boot.bin with the rpi_4_defconfig, and copied it onto my SDCard. My sdcard's config.txt is pointing to u-boot.bin as kernel=u-boot.bin
Now all this works fine as RPi Bootloader => u-boot.bin => Image (Custom Linux) => Mounts FS and stuff
Basically now I want to use signs and hashes here. Hence, changing from legacy Image to FIT Image using mkimage as : mkimage -f ritman.its -K bcm2711-rpi-4-b-pubkey.dtb -k keys -r image.fit
I am stuck at some error while booting up this image.fit --------------------------------------------------------------------------------------------------------------------------------- My its file looks like - /dts-v1/; / { description = "RPi FIT Image"; #address-cells = <2>; images { kernel-1 { description = "default kernel"; data = /incbin/("Image"); type = "kernel"; arch = "arm64"; os = "linux"; compression = "none"; load = <0x00080000>; entry = <0x00080000>; hash@1 { algo = "sha1"; }; }; fdt-1 { description = "device tree"; data = /incbin/("bcm2711-rpi-4-b.dtb"); type = "flat_dt"; arch = "arm64"; compression = "none"; hash@1 { algo = "sha1"; }; }; }; configurations { default = "config-1"; config-1 { description = "default configuration"; kernel = "kernel-1"; fdt = "fdt-1"; signature-1 { algo = "sha1,rsa2048"; key-name-hint = "dev"; sign-images = "fdt", "kernel"; }; }; }; }; ---------------------------------------------------------------------------------------------------------------------------------
Now, copied the image.fit onto SDCard boot dir. and passed the following commands as boot.scr.uimg :
setenv bootargs console=tty0 console=ttyAMA0 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait fatload mmc 0:1 0x1F000000 image.fit bootm 0x1F000000 --------------------------------------------------------------------------------------------------------------------------------- On boot-up U - Boot throws error as: 0 is current device Running mmc 0:1... U-Boot script /boot.scr.uimg Bytes read in 7 ms (24.4 KiB/s) Executing script at 02400000 Wrong image format for "source" command SCRIPT FAILED: continuing... fdt_check_header(): FDT_ERR_BADMAGIC running disk emmc2@7e340000.blkmailto:emmc2@7e340000.blk... did not respond to voltage select!: -110 running disk mmcnr@7e300000.blkmailto:mmcnr@7e300000.blk ... mmcnr@7e300000.blkmailto:mmcnr@7e300000.blk not ready 3 disks EFI system partition BootOrder not defined Boot manager : Cannot load any image did not respond to voltage select!: -110 Starting USB ... Networking controllers found Please issue 'usb start' first Waiting for PHY auto negotiation to complete... ---------------------------------------------------------------------------------------------------------------------------------
Sorry for not attaching the console output here, basically don't have access to the board via console at this moment. Basically, the boot gets stuck at the PHY auto negotiation and after a few moments, U-Boot shell comes up. As far as I understand I am being dropped into the shell only because boot.scr couldn't get the kernel from the FIT image.
Any inputs on how to mitigate this issue and boot up the FIT correctly is highly required and appreciated. Really am not sure what am I getting wrong here. Any help would be great. Thanks in advance.
Regards, Ritwik Mandal