Re: mpc8xx and ld.so problem

[Tom Rini <trini@kernel.crashing.org>]

On Mon, Jul 04, 2005 at 11:22:14AM +0300, Yuli Barcohen wrote:
> >>>>> Jason McMullan writes:
> 
> [...deleted...]
> 
>     Jason> Ha. Funny. The glibc powerpc maintainer doesn't want any
>     Jason> embedded fixes in the mainline. Last I checked, that was for
>     Jason> 'the tools vendors' to fix.
> 
>     Jason> "We won't work around processor bugs" is their philosophy.
> 
> [...deleted...]
> 
> I investigated the problem a bit when I had trouble with a self-compiled
> glibc a year or so ago. IIRC, I found bug in the memset code, not in the
> chip. The code was just wrong for cache line sizes not equal to 32. So
> memset.S is good for 60x series (PQII included) but for 8xx it fails. We
> use dcbX instructions in some kernel drivers and since we never had any
> problems with those drivers I'm a bit surprised to hear that all 8xx
> chips have got that bug.

It's also OK on a multiple of 32, iirc, but not smaller.  And using the
information the kernel does export would be too slow.  Or at least no
one figured out a good way to do it, userspace side.

-- 
Tom Rini
http://gate.crashing.org/~trini/