UBootDoesntRunAfterUpgradingMyCompiler < DULG

%SECTION0{name=UBootDoesntRunAfterUpgradingMyCompiler}% U-Boot Doesn't Run after Upgrading my Compiler

   Question:: I encountered a big problem that U-Boot 1.1.4
     compiled by ELDK 4.1 for MPC82xx crashed.
     %BR% %BR%
     But if I build it using gcc-3.4.6 based cross tools,
     U-Boot on my board boots correctly.
     %BR% %BR%
     The same U-Boot code built by ELDK 4.1 (gcc-4.0) failed,
     nothing occurs on the serial port.

   Answer:: This is often a missing =volatile= attribute
     on shared variable references, particularly hardware registers.
     Newer compiler versions optimize more aggressively,
     making missing =volatile= attributes visible.
     %BR% %BR%
     If you use -O0 (no optimization) does it fix the problem?
     %BR%
     If it does, it most likely is an optimization/volatile issue.
     The hard part is figuring out where.
     Device handling and board-specific code is the place to start.

14.2.9. Porting Problem: cannot move location counter backwards		1. Abstract		14.2.11. How Can I Reduce The Image Size?
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