Embedded PowerPC

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After successfully cross-compiling binutils-2.9.1, gcc-2.95.2, and
newlib-1.8.2 on my Linux RedHat 6.1, I tried to cross compile a very
simple C code [main() { int a; }]. 

Without giving any '-m' option, the linker complained about 'missing
_start' and several unknown references from eabi.o. [My target of
cross compilation is powerpc-eabi].

If I put one of '-msim, -mads, -myellowknife' options, the errors were
gone. However, when I tried to download the code to my PowerPC embedded
target (MPC555), the code did not seem to run.

Could someone please tell me what is the use of the above '-m....'
options. I could not find any reference to the ADS, YellowKnife, etc in
the GCC info page.

Also, how do I write a proper crt0.o for a new embedded target (i.e. what
instructions are supposed to be written inside crt0.o)?

-- 
Hans Dulimarta, Ph.D.        dulimart@[egr.msu.edu, computer.org]
                                 http://www.egr.msu.edu/~dulimart 
Visiting Research Associate,  Electrical & Computer Engineering
Michigan State University, East Lansing, MI 48824, (517) 432-7589


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