From mboxrd@z Thu Jan  1 00:00:00 1970
From: Krzysztof Halasa <khc@pm.waw.pl>
Subject: Re: [PATCH 4/7] ptp: switch to use gpiolib
Date: Fri, 13 Sep 2013 19:36:20 +0200
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Cc: Linus Walleij <linus.walleij@linaro.org>,
	"linux-gpio\@vger.kernel.org" <linux-gpio@vger.kernel.org>,
	Imre Kaloz <kaloz@openwrt.org>,
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To: Richard Cochran <richardcochran@gmail.com>
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Richard Cochran <richardcochran@gmail.com> writes:

> I was really talking about the IXP465 with its PTP function. The Inte=
l
> devel board had a silicon bug making the PTP function useless. But
> even if the bug got fixed, still the PTP function was very limiting.
>
> I never got any feedback about the IXP465 PTP stuff, and so I doubt
> whether anyone is really using the Linux PTP driver on the IXP465, bu=
t
> you never know.

Ah, OK.
I have just checked, Intel's spec update says IXP46x steppings A1 and A=
2
are fixed. PTP on 46x-A0 is broken.
42x and 43x don't support PTP.

OTOH there is interesting stuff there:
Problem: The A-0 and A-1 stepping of the Intel=C2=AE IXP45X/IXP46X Prod=
uct Line of Network
         Processors can enter a condition whereby the system locks up w=
hen certain
         combinations of memory accesses occur nearly simultaneously.

         After more extensive investigation, it has been identified tha=
t the lockup condition can
         be caused by near-simultaneous accesses to 1 or 2 cache lines.=
 The accesses to the
         cache lines must be performed by the Intel XScale processor, S=
outh AHB, and/or North
         AHB for the lockup to happen.

Hmmm...
--=20
Krzysztof Halasa