The switch to KConfig break the [board]_config target. This breaks
backwards compatibility and hence all documentation about how to
build u-boot is no longer valid. It is also annoying for general
recipes to build u-boot as contained in buildroot, crochet, oe,
poky, eldk etc. Hence restore the *_config target.

cc: Tom Rini <tr...@ti.com>
cc: Masahiro Yamada <yamad...@jp.panasonic.com>
cc: Simon Glass <s...@chromium.org>
Signed-off-by: Jeroen Hofstee <jer...@myspectrum.nl>
---
 Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 5e49545..2a339aa 100644
--- a/Makefile
+++ b/Makefile
@@ -413,7 +413,7 @@ endif
 version_h := include/generated/version_autogenerated.h
 timestamp_h := include/generated/timestamp_autogenerated.h
 
-no-dot-config-targets := clean clobber mrproper distclean \
+no-dot-config-targets := clean clobber %_config mrproper distclean \
                         help %docs check% coccicheck \
                         ubootversion backup tools-only
 
@@ -436,6 +436,11 @@ ifeq ($(KBUILD_EXTMOD),)
         endif
 endif
 
+# Before the switch to KConfig the configure target was %_config instead
+# of %_defconfig. Just reinvoke make to be backwards compatible.
+%_config: FORCE
+       $(Q)$(MAKE) $(@:_config=_defconfig)
+
 ifeq ($(mixed-targets),1)
 # ===========================================================================
 # We're called with mixed targets (*config and build targets).
-- 
1.9.1

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