1 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-x86_64/page.h b/include/asm-x86_64/page.h
index dee632fa457d..e327c830da0c 100644
--- a/include/asm-x86_64/page.h
+++ b/include/asm-x86_64/page.h
@@ -80,6 +80,15 @@ extern unsigned long phys_base;
 #define __PHYSICAL_START        CONFIG_PHYSICAL_START
 #define __KERNEL_ALIGN          0x200000
 
+/*
+ * Make sure kernel is aligned to 2MB address. Catching it at compile
+ * time is better. Change your config file and compile the kernel
+ * for a 2MB aligned address (CONFIG_PHYSICAL_START)
+ */
+#if (CONFIG_PHYSICAL_START % __KERNEL_ALIGN) != 0
+#error "CONFIG_PHYSICAL_START must be a multiple of 2MB"
+#endif
+
 #define __START_KERNEL          (__START_KERNEL_map + __PHYSICAL_START)
 #define __START_KERNEL_map      _AC(0xffffffff80000000, UL)
 #define __PAGE_OFFSET           _AC(0xffff810000000000, UL)