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binman: Add docs explaining how to enable binman for a board

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The process is not obvious. Add a little section to explain how to move a
board to use binman.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2017-11-12 21:52:06 -07:00
parent 511fd0b2bb
commit 9c0a8b1f44
1 changed files with 21 additions and 0 deletions
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21
tools/binman/README
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@ -206,6 +206,27 @@ for its instructions in the 'binman' node.
Binman has a few other options which you can see by running 'binman -h'.
Enabling binman for a board
---------------------------
At present binman is invoked from a rule in the main Makefile. Typically you
will have a rule like:
ifneq ($(CONFIG_ARCH_<something>),)
u-boot-<your_suffix>.bin: <input_file_1> <input_file_2> checkbinman FORCE
$(call if_changed,binman)
endif
This assumes that u-boot-<your_suffix>.bin is a target, and is the final file
that you need to produce. You can make it a target by adding it to ALL-y
either in the main Makefile or in a config.mk file in your arch subdirectory.
Once binman is executed it will pick up its instructions from a device-tree
file, typically <soc>-u-boot.dtsi, where <soc> is your CONFIG_SYS_SOC value.
You can use other, more specific CONFIG options - see 'Automatic .dtsi
inclusion' below.
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