--- In "Martin Guy" <> wrote:
>
> 2007/11/16, marcel.groothuis <>:
> > All software is identical, the CPU's are identical
>
> > Does somebody have any idea or suggestions why the same software runs
> > on the TS7260 and fails on the TS7300 (all other non-crunch software
> > runs perfectly)?
>
> Different silicon revisions of the Maverick Crunch hardware have
> different timing bugs that result in wrong results and mistaken
> conditional branches - springing them or not depends on the exact
> sequence of FPU instructions and how far apart they are in time.
> D1 E0 E1 have the same set of bugs (at least, no changes were made in
> the hardware)
> I gather that in E2 the bugs have moved around, so the old compiler
> workarounds no longer work
>
>
> M
>
I just checked our boards. We have both the E1 and E2 revisions
TS7260, E2 rev TS7300 and E2 rev TS7400. The crunch test runs on both
the E1 and E2 TS7260 boards and not on all TS7300 and TS7400. I will
read the errata in more detail but I am now wondering if it has
something to do with the bootloaders.
All TS7260 board have Redboot and can run the test succesfully and the
other boards (TS7300 and TS7400) have a different bootloader for
smaller boot times. Maybe Redboot initializes the hardware "better"
than the TS bootloader.
Can somebody from TS explain me if there are differences in the
hardware initialization between Redboot and the TS bootloaders that
could have something to do with the Maverick FPU?
Grt,
Marcel
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