Re: mpc8xx and ld.so problem

On Mon, Jul 04, 2005 at 11:22:14AM +0300, Yuli Barcohen wrote:

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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/