AVR-Chat

OK, lurker here.  After a year of on again, off again AVR projects, I'm 
finally doing an ATMega32 based project.  Tools are AVR Studio v4.12 
SP3, WinAVR 20060421 and 
<http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3353>AVR 
JTAGICE mkII.  The board comes in this week, so I decided to put 
together a "Hello world" program using GCC and avr-libc (polled USART 
I/O) to test it.

I figured I'd test the program first in order to be able to start with a 
known reference, so I ran it on the simulator.  First, it complained of 
an uninitialized stack pointer at the first function call.  The 
disassembly shows that the stack is initialized, but I stuck a "SP = 
RAMEND;" statement in, and it seemed to pass.  Now I get stack overflow 
and stack underflow errors on function returns.  I'm watching the Stack 
Pointer in the I/O View and it seems to be what I expected it to be.  It 
runs to completion as expected, but maybe I'm missing something.

Google and Yahoo Group searches didn't seem to yield any meaningful 
results.  Any advice?

Pat