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Diffstat (limited to 'doc/uImage.FIT/howto.txt')
| -rw-r--r-- | doc/uImage.FIT/howto.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/doc/uImage.FIT/howto.txt b/doc/uImage.FIT/howto.txt index 14e316f..2988a52 100644 --- a/doc/uImage.FIT/howto.txt +++ b/doc/uImage.FIT/howto.txt @@ -44,6 +44,27 @@ image source file mkimage + dtc transfer to target + ---------------> image file --------------------> bootm image data file(s) +SPL usage +--------- + +The SPL can make use of the new image format as well, this traditionally +is used to ship multiple device tree files within one image. Code in the SPL +will choose the one matching the current board and append this to the +U-Boot proper binary to be automatically used up by it. +Aside from U-Boot proper and one device tree blob the SPL can load multiple, +arbitrary image files as well. These binaries should be specified in their +own subnode under the /images node, which should then be referenced from one or +multiple /configurations subnodes. The required images must be enumerated in +the "loadables" property as a list of strings. + +If a platform specific image source file (.its) is shipped with the U-Boot +source, it can be specified using the CONFIG_SPL_FIT_SOURCE Kconfig symbol. +In this case it will be automatically used by U-Boot's Makefile to generate +the image. +If a static source file is not flexible enough, CONFIG_SPL_FIT_GENERATOR +can point to a script which generates this image source file during +the build process. It gets passed a list of device tree files (taken from the +CONFIG_OF_LIST symbol). Example 1 -- old-style (non-FDT) kernel booting ----------------------------------------------- |