The standard working boot transition looks like the following: External data: dst=970000, offset=adf70, size=b150 Selecting default config 'imx8mp-var-dart-dt8mcustomboard'įirmware: data: dst=40200000, offset=3000, size=a49b8įdt: get 'load' property from FIT 0x401ffc00, node: offset 244, name (FDT_ERR_NOTFOUND)Įxternal data: dst=402a49c0, offset=a79b8, size=6dd8 I have fully instrumented u-boot and see the following debug output before it locks up: fit read sector 48031da0, sectors=912, dst=401ffc00, count=912, size=0x390 But, if I enable “mender-uboot”, build the same u-boot image and load using the UUU tool u-boot will hang between the transition from SPL to the main u-boot. When I generate the standard u-boot image in Yocto and load the image through the UUU tool, all boots as expected. The image header files can be listed with the following command:ĭata Size: 23563776 Bytes = 23011.50 kB = 22.I’m attempting to load u-boot using the NXP UUU tool into a Variscite DART board with an i.MX8m-plus board. Kernel: Ramdisk: ImagesIn the same way that FIT images are generated, the containing sub images can be extracted as well using dumpimage tool. Hash value: c4f32910b03776481e2997e6e86a1a1d26f33a8fĭefault Configuration: 0 Boot Linux kernel with FDT blob + ramdisk itb file, which is going to be used by the bootm command in the target to load the Linux image.įIT description: U-Boot fitImage for plnx_aarch64 kernelĭata Size: 12263936 Bytes = 11976.50 kB = 11.70 MB } The image source file is used as an input argument for the mkimage utility to generate the resulting. its file could be used to generate define that configuration:ĭescription = "U-Boot fitImage for plnx_aarch64 kernel" ĭescription = "Flattened Device Tree blob" ĭescription = "Boot Linux kernel with FDT blob + ramdisk" The common use case for a Xilinx based device will use three input files (Kernel, DTB and initramfs) and just once configuration, so the following. The image source file is defined by mandatory/optional properties and nodes as explained here. Yocto generates the b or fit.itb file in deploy/images/ directory and PetaLinux tools will rename this to image.ub while copying to /images/linux directory.) Generate ImagesFIT works as a tree structure, like the device-tree, where a image source file (.its) and a set of data files are used as an input, and a image tree blob (.itb) is generated as an output. This format has been the default image mode for Petalinux and for the Linux Image releases since 2017.1 (The three components are wrapped in a single image.ub file). Nowadays security features also are required in most the embedded systems so security/integrity features, so a new Flattened Image Tree (FIT) uImage format was defined to provide all these features. Mkimage -n 'Kernel Image' -A arm64 -O linux -C none -T kernel -a 0x8000 -e 0x8000 -d Image uImageįlattened Image TreeSince Flattened Device-Tree was introduced in kernel 2.6 the amount of use cases that a embedded system could face was increasing (FDT missing in legacy platform, ramdisk optional.) so even the extension to the legacy image type to support multi-image was not enough to cover all the use cases as explained in here.
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