add support for dynamicially changing of recovery.fstab

AndroidBoard.mk

@@ -25,5 +25,12 @@ LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
 
+ALL_PREBUILT += $(INSTALLED_KERNEL_TARGET)
+
+file := $(TARGET_RECOVERY_ROOT_OUT)/sbin/postrecoveryboot.sh
+ALL_PREBUILT += $(file)
+$(file) : $(LOCAL_PATH)/postrecoveryboot.sh | $(ACP)
+	$(transform-prebuilt-to-target)
+
 # include the non-open-source counterpart to this file
 -include vendor/htc/leo/AndroidBoardVendor.mk

postrecoveryboot.sh

@@ -0,0 +1,7 @@
+#!/sbin/sh
+
+sleep 2
+
+if [[ ! `grep clk= /proc/cmdline` ]]; then
+sed -i 's/\/boot\t\tmtd/\/boot\t\tyaffs2/g' /etc/recovery.fstab
+fi