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dts: renamed FIT_EMBED to MULTI_DTB_FIT and moved it to the dts Kconfig

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CONFIG_FIT_EMBED might be confused with CONFIG_OF_EMBED, rename it
MULTI_DTB_FIT as it is able to get a DTB from a FIT image containing
multiple DTBs. Also move the option to the Kconfig dedicated to the DTS
options and create a README for this feature.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jean-Jacques Hiblot
2017-09-15 12:57:24 +02:00
committed by Tom Rini
parent 84570a0c11
commit 11955590a2
14 changed files with 45 additions and 28 deletions
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doc/README.multi-dtb-fit Normal file
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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().