Workaround buggy timer in raspberry pie by using our own timer

implementation.

include/grub/arm/linux.h

@@ -23,11 +23,7 @@
 #define LINUX_ZIMAGE_OFFSET 0x24
 #define LINUX_ZIMAGE_MAGIC  0x016f2818
 
-enum
-  {
-    GRUB_ARM_MACHINE_TYPE_RASPBERRY_PI = 3138,
-    GRUB_ARM_MACHINE_TYPE_FDT = 0xFFFFFFFF
-  };
+#include "system.h"
 
 #if defined GRUB_MACHINE_UBOOT
 # include <grub/uboot/uboot.h>

include/grub/arm/system.h

@@ -1,6 +1,12 @@
 #ifndef GRUB_SYSTEM_CPU_HEADER
 #define GRUB_SYSTEM_CPU_HEADER
 
+enum
+  {
+    GRUB_ARM_MACHINE_TYPE_RASPBERRY_PI = 3138,
+    GRUB_ARM_MACHINE_TYPE_FDT = 0xFFFFFFFF
+  };
+
 void grub_arm_disable_caches_mmu (void);
 
 #endif /* ! GRUB_SYSTEM_CPU_HEADER */