Date: Sat, 27 Sep 2008 23:40:50 -0700 From: Peter Grehan <grehan@freebsd.org> To: Marcel Moolenaar <xcllnt@mac.com> Cc: freebsd-ppc@freebsd.org Subject: Re: 8.0-current 200809 snapshot CD boot problem Message-ID: <48DF26F2.1000209@freebsd.org> In-Reply-To: <11FEA924-DB76-46E1-BF79-A26206F796C0@mac.com> References: <b9c23c9f0809230355y26d463c4s5a60a22293daa05d@mail.gmail.com> <b9c23c9f0809230952n159c3179t90b6a542eaf94a4f@mail.gmail.com> <b9c23c9f0809231028j3d20b1bcgc8f4aaec15fe23d2@mail.gmail.com> <48DD91A4.2060306@freebsd.org> <b9c23c9f0809270348t7c4f1976y3134d2d5aa2ee15@mail.gmail.com> <263AF44F-FC15-4700-B93B-B0DE07A17B40@mac.com> <b9c23c9f0809271354j500d58f2o7c2a039a42d4caa5@mail.gmail.com> <11FEA924-DB76-46E1-BF79-A26206F796C0@mac.com>
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Hi Marcel,
> o I-cache coherency
The culprit could be the code fragment in
sys/boot/ofw/libofw/elf_freebsd.c:__elfN(ofw_loadfile),
if (!strcmp((*result)->f_type, "elf kernel"))
__syncicache((void *) (*result)->f_addr,
(*result)->f_size);
If f_addr isn't the start of the text segment i.e. if the initial page
wasn't included, then that is what is blowing up.
> Quick question: On ARM and ia64 you need to sync the
> D-cache before you can make the I-cache coherent. That's
> because the I-cache is made coherent with memory and
> not with the D-cache. How's that on PowerPC?
Same - see powerpc/syncicache.c where the d-cache is flushed before
the invalidating the i-cache.
later,
Peter.
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