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FreeRTOS Support ArchiveThe FreeRTOS support forum is used to obtain active support directly from Real Time Engineers Ltd. In return for using our top quality software and services for free, we request you play fair and do your bit to help others too! Sign up to receive notifications of new support topics then help where you can.
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FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on September 4, 2006 has anybody compiled for arm7tdmi with -O0 option using gcc 4.1.1? My OS under at91sam7s256 still crashes without optimalization :( Janusz RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on September 4, 2006 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 RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on September 5, 2006 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? RE: FreeRTOS under GCC with -O0 optionPosted by acehigh1971 on September 5, 2006 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 RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on September 6, 2006 You are my master!!! I have added and OS work with everthing with -O0 flag!!! Thanks a lot!!! Janusz RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on September 6, 2006 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 RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on September 6, 2006 I was wrong, with -O2 can crash also bu -O0 is great:) thanks again Janusz RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on September 6, 2006 reason: -O2 causes more stack usage! Janusz RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on September 21, 2006 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. RE: FreeRTOS under GCC with -O0 optionPosted by dennis on February 13, 2007 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 RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on February 13, 2007 Don't suppose you've tried the webserver side of it have you?... cos it's not working here. RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on February 13, 2007 Scratch that, my switch locked up. Sorry :) RE: FreeRTOS under GCC with -O0 optionPosted by Nobody/Anonymous on February 13, 2007 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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