RedBoot hits fetch instruction trap

[Les Miklosy <lgm0 at verizon dot net>]

During execution of RedBoot configured for a  Sparc Leon3 IP core the 
process hits a trap on instruction fetch in the RedBoot routine 
_timer_poll(). The debugger history and assembly are attached. The 
process will execute RedBoot commands at the command prompt and 
otherwise behave normally until a branch instruction to do_idle and 
subsequently net_io_test(), that is where execution eventually fails.

Oddly the process runs without fault when DEBUG command options are 
selected during configuration of the build with configtool, trouble 
begins when the DEBUG options are again removed. The DEBUG instructions 
appear in the ethernet modules and in RedBoot's net_io. If this is a 
timing issue can someone please suggest what parameters can be tweeked 
to resolve the traps, or if a memory alignment problem can someone offer 
a memory map and alignment parameters? Are there configuration 
selections in the amba bus header file, those might be helpful too.

The compiler is sparc-elf-gcc-3.4.4  I'm using two additional 
compilation flags  -msoft-float and D-ECOS. The system configuration is 
also attached to this email.  Thank you for directions. -Les

Attachment: info_sys.txt
Description: Text document

Attachment: timer_poll.txt
Description: Text document

Attachment: timer_trap.txt
Description: Text document

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