From: Andy Green <andy-/Zus8d0mwwtBDgjK7y7TUQ@public.gmane.org>
To: "Premi, Sanjeev" <premi-l0cyMroinI0@public.gmane.org>
Cc: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
"patches-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<patches-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Subject: Re: [RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper
Date: Fri, 18 Mar 2011 14:47:49 +0000 [thread overview]
Message-ID: <4D837095.5040307@linaro.org> (raw)
In-Reply-To: <B85A65D85D7EB246BE421B3FB0FBB593024C3B8670-/tLxBxkBPtCIQmiDNMet8wC/G2K4zDHf@public.gmane.org>
On 03/18/2011 02:37 PM, Somebody in the thread at some point said:
Hi -
> [sp] This 'trick' has been tried earlier in u-boot. See:
> http://www.mail-archive.com/u-boot-0aAXYlwwYIKGBzrmiIFOJg@public.gmane.org/msg19915.html
>
> I am also not sure whether DIE_ID would really be unique.
It doesn't actually need all the bits to be unique for this, just have a
low probability of collision with a reasonable number of devices sharing
the same network.
If there is not enough variation as it stands in the first 6 bytes of
it, all the 128 bit ID can be xor'd together, use the other registers
about die revision, hawkeye also xored in, etc.
I'll ask about what can be expected from this at TI.
-Andy
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next prev parent reply other threads:[~2011-03-18 14:47 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-12 22:50 [RFC PATCH 0/5] OMAP2+ / Panda implementation for async platform_data Andy Green
2011-03-12 22:50 ` [RFC PATCH 1/5] OMAP2+: Panda introduce async platform data definition Andy Green
2011-03-13 1:05 ` Greg KH
2011-03-12 22:50 ` [RFC PATCH 2/5] OMAP2+: add cpu id register to MAC address helper Andy Green
2011-03-18 8:34 ` Arnd Bergmann
2011-03-18 8:49 ` Andy Green
2011-03-18 14:37 ` Premi, Sanjeev
[not found] ` <B85A65D85D7EB246BE421B3FB0FBB593024C3B8670-/tLxBxkBPtCIQmiDNMet8wC/G2K4zDHf@public.gmane.org>
2011-03-18 14:47 ` Andy Green [this message]
[not found] ` <20110312225047.27728.1835.stgit-MbR9/eEqKADKkTgpAXvmkg@public.gmane.org>
2011-03-18 8:52 ` Roger Quadros
[not found] ` <4D831D4B.8090407-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org>
2011-03-18 9:13 ` Andy Green
2011-03-12 22:50 ` [RFC PATCH 3/5] OMAP2+:Common CPU DIE ID reading code reads wrong registers for OMAP4430 Andy Green
2011-03-14 18:12 ` Tony Lindgren
2011-03-12 22:51 ` [RFC PATCH 4/5] OMAP2+: Set onboard Ethernet MAC address using unique CPU ID data Andy Green
[not found] ` <20110312224440.27728.60593.stgit-MbR9/eEqKADKkTgpAXvmkg@public.gmane.org>
2011-03-12 22:51 ` [RFC PATCH 5/5] USBNET: SMSC95XX: if mac set in platform data no need for random one Andy Green
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