has anybody compiled for arm7tdmi with -O0 option using gcc 4.1.1? My OS under at91sam7s256 still crashes without optimalization :( Janusz
interesting links for trace/debug: http://www.embedded.com/showArticle.jhtml?articleID=192202641 http://www.l8night.co.uk/mwynn/gbadev/asmdocs/gba-arm-asm.html Janusz
The makefiles for the LPC2000, AT91FR40008 and AT91SAM7X256 ARM7/GCC projects in the download use -O0, so it must be possible. Using -O0 will make the code and stack useage greater. Is this the problem rather than the code gen?
I added the -fomit-frame-pointer option so the frame was not used when calling a function (indeed is not needed) and I can change the optim level without worrying. Can you test it? Thanks
You are my master!!! I have added and OS work with everthing with -O0 flag!!! Thanks a lot!!! Janusz
with -O0 works fine with -O1 crashes (but it is no this reason -> then gcc uses a lot of stack) with -O2 works fine best regards Janusz
I was wrong, with -O2 can crash also bu -O0 is great:) thanks again Janusz
reason: -O2 causes more stack usage! Janusz
I was having issues with FreeRTOS 4.1.0, GNUARM 4.11 and the LWIP SAM7 demo package until the -fomit-frame-pointer was put into the makefile. The AT91SAM7X256 is running now.
I experienced the same problem with dsPic. Does anybody know why Frame Pointer crashes with FreeRTOS? Is it because somehow both are pushing and popping the stack? Cheers. Dennis
Don’t suppose you’ve tried the webserver side of it have you?… cos it’s not working here.
Scratch that, my switch locked up. Sorry :)
I think there is a bug in ARM7 GCC that holds the pointer in an invalid place for a few cycles. Search the forum for "-fomit-frame-pointer" and there is an explanation. It may even be in this thread.
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