-----Original Message-----
From: linux-omap-owner at vger.kernel.org 
[mailto:linux-omap-owner at vger.kernel.org] On Behalf Of Arnd Bergmann
Sent: Friday, March 18, 2011 2:05 PM
To: Andy Green
Cc: linux-kernel at vger.kernel.org; linux-usb at vger.kernel.org; 
linux-omap at vger.kernel.org; 
linux-arm-kernel at lists.infradead.org; patches at linaro.org; Andy Green
Subject: Re: [RFC PATCH 2/5] OMAP2+: add cpu id register to 
MAC address helper

On Saturday 12 March 2011, Andy Green wrote:

quoted

Introduce a generic helper function that can set a MAC address using
data from the OMAP unqiue CPU ID register.

Signed-off-by: Andy Green <redacted>
---

 arch/arm/mach-omap2/id.c              |   13 +++++++++++++
 arch/arm/mach-omap2/include/mach/id.h |    1 +
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 5f9086c..fc69ec5 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c

@@ -506,3 +506,16 @@ void __init 

omap2_set_globals_tap(struct omap_globals *omap2_globals)

quoted

        else
                tap_prod_id = 0x0208;
 }
+
+
+void omap2_die_id_to_mac(u8 *mac, int length)
+{
+       struct omap_die_id odi;
+
+       omap_get_die_id(&odi);
+       memcpy(mac, &odi.id_0, length);
+
+       /* mark it as not multicast and outside official 

80211 MAC namespace */

quoted

+
+       mac[0] = (mac[0] & ~1) | 2;
+}

This is a pretty clever trick, but it's not an official 
globally unique MAC
address, right?

[sp] This 'trick' has been tried earlier in u-boot. See:
     http://www.mail-archive.com/u-boot at lists.denx.de/msg19915.html

     I am also not sure whether DIE_ID would really be unique.

~sanjeev

Maybe we can ask TI to officially request a 
MAC address range
for OMAP SoCs and document an official procedure to compute it.

	Arnd
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