Avoid initrd and logbuffer area overlaps

Add logbuffer to reserved LMB areas to prevent initrd allocation
from overlaping with it.

Make sure to use correct logbuffer base address.

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
diff --git a/common/image.c b/common/image.c
index 67e594d..9188024 100644
--- a/common/image.c
+++ b/common/image.c
@@ -35,6 +35,10 @@
 #include <dataflash.h>
 #endif
 
+#ifdef CONFIG_LOGBUFFER
+#include <logbuff.h>
+#endif
+
 #if defined(CONFIG_TIMESTAMP) || defined(CONFIG_CMD_DATE)
 #include <rtc.h>
 #endif
@@ -1013,6 +1017,12 @@
 		initrd_high = ~0;
 	}
 
+
+#ifdef CONFIG_LOGBUFFER
+	/* Prevent initrd from overwriting logbuffer */
+	lmb_reserve(lmb, logbuffer_base() - LOGBUFF_OVERHEAD, LOGBUFF_RESERVE);
+#endif
+
 	debug ("## initrd_high = 0x%08lx, copy_to_ram = %d\n",
 			initrd_high, initrd_copy_to_ram);