[ptxdist] [PATCH v2] u-boot: Add support for custom make options

["Guillermo Rodríguez" <guille.rodriguez@gmail.com>]

For some platforms (e.g. stm32mp1) the official way to build U-boot
with a device tree other than the board's default requires passing
additional make options such as DEVICE_TREE=xxx or EXT_DTB=xxx.
Instead of adding each possible option as a parameter in the .in
file, add a generic mechanism to allow passing custom make options
to U-boot. A similar approach has been adopted by buildroot.

Signed-off-by: Guillermo Rodriguez <guille.rodriguez@gmail.com>
---
v2: Rewrite commit message including rationale

 platforms/u-boot.in | 7 +++++++
 rules/u-boot.make   | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/platforms/u-boot.in b/platforms/u-boot.in
index 50fb008a3..491faed60 100644
--- a/platforms/u-boot.in
+++ b/platforms/u-boot.in
@@ -71,6 +71,13 @@ config U_BOOT_CONFIG
 
 endif
 
+config U_BOOT_CUSTOM_MAKE_OPTS
+	prompt "Custom make options"
+	string
+	help
+	  List of custom make options passed at build time. Can be
+	  used for example to pass a DEVICE_TREE= value.
+
 choice
 	prompt "Generate environment image"
 	default U_BOOT_ENV_IMAGE_NONE
diff --git a/rules/u-boot.make b/rules/u-boot.make
index 0c6bccc71..e386dc4d2 100644
--- a/rules/u-boot.make
+++ b/rules/u-boot.make
@@ -55,7 +55,8 @@ U_BOOT_WRAPPER_BLACKLIST := \
 U_BOOT_CONF_OPT		:= \
 	-C $(U_BOOT_DIR) \
 	O=$(U_BOOT_BUILD_DIR) \
-	V=$(PTXDIST_VERBOSE)
+	V=$(PTXDIST_VERBOSE) \
+	$(call remove_quotes,$(PTXCONF_U_BOOT_CUSTOM_MAKE_OPTS))
 
 U_BOOT_MAKE_ENV		:= \
 	CROSS_COMPILE=$(BOOTLOADER_CROSS_COMPILE) \
-- 
2.21.0


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