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Diffstat (limited to 'doc/README.multi-dtb-fit')
| -rw-r--r-- | doc/README.multi-dtb-fit | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/doc/README.multi-dtb-fit b/doc/README.multi-dtb-fit new file mode 100644 index 0000000000..0d4f068bbf --- /dev/null +++ b/doc/README.multi-dtb-fit @@ -0,0 +1,15 @@ +MULTI DTB FIT + +The purpose of this feature is to enable u-boot to select its DTB from a FIT +appended at the end of the binary. + +Usually the DTB is selected by the SPL and passed down to U-Boot. But some +platforms don't use the SPL. In this case MULTI_DTB_FIT can used to provide +U-Boot with a choice of DTBs. +The relevant DTBs are packed into a FIT (list provided by CONFIG__OF_LIST). The +FIT is automatically generated at the end of the compilation and appended to +u-boot.bin so that U-Boot can locate it and select the correct DTB from inside +the FIT. +The selection is done using board_fit_config_name_match() (same as what the SPL +uses to select the DTB for U-Boot). The selection happens during fdtdec_setup() +which is called during before relocation by board_init_f(). |