linux-kernel - [PATCH 1/4] ARM: LPC32xx: Set system serial based on cpu unique id

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Date:	Wed, 18 Jul 2012 14:06:48 +0200
From:	Roland Stigge <stigge@...com.de>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kevin.wells@....com, srinivas.bakki@....com, aletes.xgr@...il.com
Cc:	Roland Stigge <stigge@...com.de>
Subject: [PATCH 1/4] ARM: LPC32xx: Set system serial based on cpu unique id

From: Alexandre Pereira da Silva <aletes.xgr@...il.com>

LPC32xx SoC has a 128 bits unique id that can be used as a system
serial number, if none has been provided by atags or dt.

Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@...il.com>
Signed-off-by: Roland Stigge <stigge@...com.de>
---
 arch/arm/mach-lpc32xx/common.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- linux-2.6.orig/arch/arm/mach-lpc32xx/common.c
+++ linux-2.6/arch/arm/mach-lpc32xx/common.c
@@ -26,6 +26,7 @@
 #include <linux/io.h>
 
 #include <asm/mach/map.h>
+#include <asm/system_info.h>
 
 #include <mach/hardware.h>
 #include <mach/platform.h>
@@ -224,7 +225,7 @@ void lpc23xx_restart(char mode, const ch
 		;
 }
 
-static int __init lpc32xx_display_uid(void)
+static int __init lpc32xx_check_uid(void)
 {
 	u32 uid[4];
 
@@ -233,6 +234,11 @@ static int __init lpc32xx_display_uid(vo
 	printk(KERN_INFO "LPC32XX unique ID: %08x%08x%08x%08x\n",
 		uid[3], uid[2], uid[1], uid[0]);
 
+	if (!system_serial_low && !system_serial_high) {
+		system_serial_low = uid[0];
+		system_serial_high = uid[1];
+	}
+
 	return 1;
 }
-arch_initcall(lpc32xx_display_uid);
+arch_initcall(lpc32xx_check_uid);
--
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