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Makefile: Only build dtc if needed

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At present U-Boot always builds dtc if CONFIG_OF_CONTROL is defined, even
when DTC is provided. The built dtc is not actually used, so this is a
waste of time.

Update the Makefile logic to build dtc only if one is not provided to the
build with the DTC variable. Add documentation to explain this.

This saves about 3.5 seconds of elapsed time on a clean build of
sandbox_spl for me.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2021-09-22 11:34:44 -06:00
committed by Tom Rini
parent d7faa082a5
commit 93b1965322
5 changed files with 55 additions and 8 deletions
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4
dts/Kconfig
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@@ -5,9 +5,6 @@
config SUPPORT_OF_CONTROL
bool
config DTC
bool
config PYLIBFDT
bool
@@ -42,7 +39,6 @@ menu "Device Tree Control"
config OF_CONTROL
bool "Run-time configuration via Device Tree"
select DTC
select OF_LIBFDT if !OF_PLATDATA
select OF_REAL if !OF_PLATDATA
help