From: Giuliano Pochini <pochini@shiny.it>
To: Adrian Cox <adrian@humboldt.co.uk>
Cc: linuxppc-dev@lists.linuxppc.org
Subject: RE: New 745x errata
Date: Fri, 14 Nov 2003 11:40:53 +0100 (CET) [thread overview]
Message-ID: <XFMail.20031114114053.pochini@shiny.it> (raw)
In-Reply-To: <1068721518.23764.84.camel@newt>
On 13-Nov-2003 Adrian Cox wrote:
>
> Since October there are new errata on Motorola's website for the 745x
> family processors. The following patch against linuxppc-2.4-devel
> contains workarounds to two problems:
>
> 1) The BTIC doesn't work reliably: it can cause execution of corrupted
> instructions. (This is listed in the errata for the 7450 and 7457, but
> not for the 7455. I'll only believe that the 7455 escaped this bug if I
> hear confirmation out of Motorola.)
Did you try to ask them about it ?
> 2) dcbt to protected addresses can cause spurious bus cycles. This could
> potentially be exploited from userspace to lock up hardware.
Hm, a 1-cycle window this is very small. Anyway, if dc* instructions are
used inside the kernel, we could keep them disabled in userspace only.
--
Giuliano.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2003-11-14 10:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-13 11:05 New 745x errata Adrian Cox
2003-11-14 10:40 ` Giuliano Pochini [this message]
2003-11-14 11:00 ` Adrian Cox
2003-11-14 16:24 ` Tom Rini
2003-11-17 14:57 ` Adrian Cox
2003-11-17 15:04 ` Tom Rini
2003-11-17 15:34 ` Adrian Cox
2003-11-18 8:40 ` Giuliano Pochini
2003-11-17 15:12 ` Gabriel Paubert
2003-11-17 15:37 ` Adrian Cox
2003-11-17 15:49 ` Gabriel Paubert
2003-11-17 17:05 ` Gabriel Paubert
2003-11-17 17:34 ` Jon Masters
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