u-boot: avoid blind merging all *.cfg

This fixes u-boot-qoriq breakage of:

    commit 4fde8c8f479f5acd24fb6e0d0b9b4dc94d6f560b
    Author: Ming Liu <ming.liu@toradex.com>
    Date:   Wed Jun 3 13:56:01 2020 +0200

	u-boot: support merging .cfg files for UBOOT_CONFIG

	U-boot recipe supports .cfg files in SRC_URI, but they would be merged
	to .config during do_configure only when UBOOT_MACHINE is set, we
	should also support merging .cfg files for UBOOT_CONFIG.

The intension of 4fde8c8 looks more than append delta-config snippets to
u-boot config and should probably be rewritten to express that much better
than implicitely assume all "*.cfg" are for merging into .config.

(From OE-Core rev: b4644f231a1463123d4100fcaf1448b3d174ef1a)

Signed-off-by: Jens Rehsack <sno@netbsd.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/meta/recipes-bsp/u-boot/u-boot.inc b/meta/recipes-bsp/u-boot/u-boot.inc
index f6a68da0f6..c91da02959 100644
--- a/meta/recipes-bsp/u-boot/u-boot.inc
+++ b/meta/recipes-bsp/u-boot/u-boot.inc
@@ -89,8 +89,10 @@ do_configure () {
                 j=$(expr $j + 1);
                 if [ $j -eq $i ]; then
                     oe_runmake -C ${S} O=${B}/${config} ${config}
-                    merge_config.sh -m -O ${B}/${config} ${B}/${config}/.config ${@" ".join(find_cfgs(d))}
-                    oe_runmake -C ${S} O=${B}/${config} oldconfig
+                    if [ test -n "${@' '.join(find_cfgs(d))}" ]; then
+                        merge_config.sh -m -O ${B}/${config} ${B}/${config}/.config ${@" ".join(find_cfgs(d))}
+                        oe_runmake -C ${S} O=${B}/${config} oldconfig
+                    fi
                 fi
             done
             unset j
@@ -123,7 +125,7 @@ do_compile () {
         echo ${UBOOT_LOCALVERSION} > ${S}/.scmversion
     fi
 
-    if [ -n "${UBOOT_CONFIG}" ]
+    if [ -n "${UBOOT_CONFIG}" -o -n "${UBOOT_DELTA_CONFIG}" ]
     then
         unset i j k
         for config in ${UBOOT_MACHINE}; do