Re: [PATCH v3 2/2] Makefile: Only build dtc if needed

On Wed, Sep 22, 2021 at 11:34:44AM -0600, Simon Glass wrote:

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

Applied to u-boot/master, thanks!