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u-boot: add an option to indicate that DTC is needed

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Some U-Boot configurations require the Device Tree compiler to be
available, so we need to depend on host-dtc (example configuration:
zynq_zed).

However, we don't want to build it unconditionally, since the vast
majority of U-Boot configurations don't need it (and host-dtc itself
has a bunch of dependencies).

So, we simply add a Config.in option that allows users to indicate
whether their U-Boot needs DTC or not, and depend on host-dtc if this
option is enabled.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2015-10-03 20:44:13 +01:00 committed by Peter Korsgaard
parent 5774f07d43
commit 76f2230d2c
2 changed files with 11 additions and 0 deletions
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7
boot/uboot/Config.in
View File

@ -139,6 +139,13 @@ config BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE
Path to the U-Boot configuration file. Path to the U-Boot configuration file.
endif endif
config BR2_TARGET_UBOOT_NEEDS_DTC
bool "U-Boot needs dtc"
select BR2_PACKAGE_HOST_DTC
help
Select this option if your U-Boot board configuration
requires the Device Tree compiler to be available.
choice choice
prompt "U-Boot binary format" prompt "U-Boot binary format"
default BR2_TARGET_UBOOT_FORMAT_BIN default BR2_TARGET_UBOOT_FORMAT_BIN

4
boot/uboot/uboot.mk
View File

@ -77,6 +77,10 @@ UBOOT_MAKE_OPTS += \
CROSS_COMPILE="$(TARGET_CROSS)" \ CROSS_COMPILE="$(TARGET_CROSS)" \
ARCH=$(UBOOT_ARCH) ARCH=$(UBOOT_ARCH)
ifeq ($(BR2_TARGET_UBOOT_NEEDS_DTC),y)
UBOOT_DEPENDENCIES += host-dtc
endif
# Helper function to fill the U-Boot config.h file. # Helper function to fill the U-Boot config.h file.
# Argument 1: option name # Argument 1: option name
# Argument 2: option value # Argument 2: option value