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| -rw-r--r-- | Documentation/lib/payloads/fit.md | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/Documentation/lib/payloads/fit.md b/Documentation/lib/payloads/fit.md index ac7b3e6068..53be92ecf7 100644 --- a/Documentation/lib/payloads/fit.md +++ b/Documentation/lib/payloads/fit.md @@ -25,7 +25,7 @@ The section must be named in order to be found by the FIT parser: The FIT parser needs architecure support. ### aarch64 -The source code can be found in ''src/arch/arm64/fit.c''. +The source code can be found in `src/arch/arm64/fit.c`. On aarch64 the kernel (a section named 'kernel') must be in **Image** format and it needs a devicetree (a section named 'fdt') to boot. @@ -83,7 +83,7 @@ If no matching compat string is found, the default config is chosen. ## Building FIT image -The FIT image has to be built by calling ''mkimage''. You can use +The FIT image has to be built by calling `mkimage`. You can use the following example configuration: ``` @@ -148,9 +148,20 @@ the following example configuration: }; ``` -It includes a compressed initrd **initramfs.cpio.xz**, which will be -decompressed by the Linux kernel, a compressed kernel **Image.lzma**, which will -be decompressed by the FIT loader and an uncompressed devicetree blob. +Save it as ITS file `config.its` along with the other files defined here: +* target.dtb +* initramfs.cpio.xz +* Image.lzma + +Generate the `uImage` that will be included into the CBFS by calling + +```bash +mkimage -f config.its uImage +``` + +The generated file includes a compressed initrd **initramfs.cpio.xz**, which +will be decompressed by the Linux kernel, a compressed kernel **Image.lzma**, +which will be decompressed by the FIT loader and an uncompressed devicetree blob. [uImage.FIT]: https://raw.githubusercontent.com/u-boot/u-boot/master/doc/uImage.FIT/howto.txt [U-Boot]: https://www.denx.de/wiki/U-Boot |