New 745x errata

Adrian Cox adrian at
Tue Nov 18 01:57:53 EST 2003

On Fri, 2003-11-14 at 16:24, Tom Rini wrote:
> On Thu, Nov 13, 2003 at 11:05:17AM +0000, Adrian Cox wrote:
> > 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.)
> I've done the opposite in something I've been waiting for 2.4.24-pre to
> come out to fix.  But I agree that it is odd that it's not listed on the
> 7455.

Still no word back from Motorola on the 7455. I think your patch should
go in.

Any opinion on the dcbt issue?  It looks like it could provide a way for
a malicious userspace application to crash the machine, though it needs
a combination of:
1) good timing
2) a peripheral that would be confused by an extra read cycle

- Adrian Cox

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