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boot/uboot: add option to pass custom variables to U-Boot build

U-Boot supports a number of environment variables to pass specific
information. The following patches were submitted in the past to one
some specific Config.in option to pass some of these variables:

 - http://patchwork.ozlabs.org/patch/881197/ proposed an option to
   pass a custom EXT_DTB= variable

 - http://patchwork.ozlabs.org/patch/1018245/ proposed an option to
   pass a custom DEVICE_TREE= variable

Instead of adding one Config.in option for each of those variables,
let's provide a generic mechanism to pass arbitrary variables during
U-Boot build step.

Cc: Konstantin Porotchkin <kostap@marvell.com>
Cc: Clemens Gruber <clemens.gruber@pqgruber.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Thomas Petazzoni 5 years ago
parent
commit
cc151c3993
2 changed files with 8 additions and 1 deletions
  1. 6 0
      boot/uboot/Config.in
  2. 2 1
      boot/uboot/uboot.mk

+ 6 - 0
boot/uboot/Config.in

@@ -552,4 +552,10 @@ config BR2_TARGET_UBOOT_CUSTOM_DTS_PATH
 
 endif
 
+config BR2_TARGET_UBOOT_CUSTOM_MAKEOPTS
+	string "Custom make options"
+	help
+	  List of custom make options passed at build time. Can be
+	  used for example to pass a DEVICE_TREE= value.
+
 endif # BR2_TARGET_UBOOT

+ 2 - 1
boot/uboot/uboot.mk

@@ -133,7 +133,8 @@ UBOOT_MAKE_OPTS += \
 	CROSS_COMPILE="$(TARGET_CROSS)" \
 	ARCH=$(UBOOT_ARCH) \
 	HOSTCC="$(HOSTCC) $(subst -I/,-isystem /,$(subst -I /,-isystem /,$(HOST_CFLAGS)))" \
-	HOSTLDFLAGS="$(HOST_LDFLAGS)"
+	HOSTLDFLAGS="$(HOST_LDFLAGS)" \
+	$(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_MAKEOPTS))
 
 ifeq ($(BR2_TARGET_UBOOT_NEEDS_ATF_BL31),y)
 UBOOT_DEPENDENCIES += arm-trusted-firmware