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Commit 4040d10a authored by Linus Walleij's avatar Linus Walleij
Browse files

ARM: ux500: add DB serial number to entropy pool 



This throws the DB (digital baseband, ASIC) serial number, process
type etc into the entropy pool by way of the device_add_randomness()
call. This should make every device have a unique pool state upon
boot.

Cc: Theodore Tso <tytso@mit.edu>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent a3a6c6a3

arch/arm/mach-ux500/cpu-db8500.c

+4 −1
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ 
#include <linux/platform_device.h>

#include <linux/io.h>

#include <linux/mfd/abx500/ab8500.h>

#include <linux/platform_data/usb-musb-ux500.h>

#include <linux/random.h>



#include <asm/pmu.h>

#include <asm/mach/map.h>
@@ -24,7 +26,6 @@ 
#include <mach/hardware.h>

#include <mach/setup.h>

#include <mach/devices.h>

#include <linux/platform_data/usb-musb-ux500.h>

#include <mach/db8500-regs.h>



#include "devices-db8500.h"
@@ -187,6 +188,8 @@ static const char *db8500_read_soc_id(void) 
{

	void __iomem *uid = __io_address(U8500_BB_UID_BASE);



	/* Throw these device-specific numbers into the entropy pool */

	add_device_randomness(uid, 0x14);

	return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",

			 readl((u32 *)uid+1),

			 readl((u32 *)uid+1), readl((u32 *)uid+2),