ARM: OMAP2+: Set system_rev from ATAGS for n900

This fixed a regression with DT boot compared to legacy boot.

Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Tested-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
[tony@atomide.com: edited patch subject to follow standard]
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index 809827265fb39d1b8a7178481bb91e87951c4a14..bab814d2f37dcc9a18229d5e912422a653307088 100644 (file)
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c
@@ -18,6 +18,7 @@
 
 #include <asm/setup.h>
 #include <asm/mach/arch.h>
+#include <asm/system_info.h>
 
 #include "common.h"
 
@@ -77,12 +78,31 @@ static const char *const n900_boards_compat[] __initconst = {
        NULL,
 };
 
+/* Set system_rev from atags */
+static void __init rx51_set_system_rev(const struct tag *tags)
+{
+       const struct tag *tag;
+
+       if (tags->hdr.tag != ATAG_CORE)
+               return;
+
+       for_each_tag(tag, tags) {
+               if (tag->hdr.tag == ATAG_REVISION) {
+                       system_rev = tag->u.revision.rev;
+                       break;
+               }
+       }
+}
+
 /* Legacy userspace on Nokia N900 needs ATAGS exported in /proc/atags,
  * save them while the data is still not overwritten
  */
 static void __init rx51_reserve(void)
 {
-       save_atags((const struct tag *)(PAGE_OFFSET + 0x100));
+       const struct tag *tags = (const struct tag *)(PAGE_OFFSET + 0x100);
+
+       save_atags(tags);
+       rx51_set_system_rev(tags);
        omap_reserve();
 }