linux: Import minimal defconfigs as defconfigs

Now that minimal kernel defconfigs are used in Buildroot, the problem
is that copying those minimal configuration files to .config in the
kernel source tree does not work, as kconfig will ask interactively
what should be the value for all unspecified options.

On suggestion on Sam Ravnborg, the easiest way to solve this is to
import the minimal defconfig file as a defconfig inside the kernel
tree (in arch/$(ARCH)/configs) and configure the kernel with it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

diff --git a/linux/linux.mk b/linux/linux.mk
index e9c37ebc7d5a2bdcd0cb0e213ae908c1e2d722ae..639e4cee96bf31530fb8bf18f7fb8ce7d764b0a0 100644 (file)
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -86,7 +86,9 @@ $(LINUX26_DIR)/.stamp_configured: $(LINUX26_DIR)/.stamp_patched
 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
        $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX26_MAKE_FLAGS) -C $(@D) $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
-       cp $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE) $(@D)/.config
+       cp $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE) $(@D)/arch/$(KERNEL_ARCH)/configs/buildroot_defconfig
+       $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX26_MAKE_FLAGS) -C $(@D) buildroot_defconfig
+       rm $(@D)/arch/$(KERNEL_ARCH)/configs/buildroot_defconfig
 endif
 ifeq ($(BR2_ARM_EABI),y)
        $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config)