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Settings for RVDS 4.0 with ARM Cortex-A8 Processor

Note: This was originally posted on 20th May 2009 at http://forums.arm.com

Hi everyone,
I am new to RVDS 4.0. I am able to run a simple application like addition with other processors (ARM11).

#include <stdio.h>

int main()
{
 float a,b,c;
 a = 1.3; b = 2.6;
 c = a+b;
 printf("c = %f\n",c);
 
}

But, when i compile and run the same application for ARM Cortex-A8, its going to infinite loop.

################################################################################
##
Compiler Settings:
--arm --debug --cpu=Cortex-A8 --fpu=VFPv3 --fpmode=ieee_fixed -O1 --vectorize

Assembler Settings:
--arm -g --cpu=Cortex-A8 --fpu=VFPv3 --fpmode=ieee_fixed

Linker Settings:
--cpu=Cortex-A8 --fpu=VFPv3 --fpmode=ieee_fixed

################################################################################
##

*******************************

In RV Debbuer, i connected the target to ARM Cortex-A8. Its mode is set to SVC mode by default.
After loading the image, the Log window shows these messages:

Workspace: Opening Connections...
Workspace: connect "ARM_Cortex-A8_0@ISSM"
Attached to stopped device
Workspace: Init/Open done.
Warning: 88 registers defined for this core are not available from the target.

*******************************

*******************************************************
If the stop the program in between i observe the following instructions.

   S:00000818 00000000 ANDEQ    r0,r0,r0
   S:0000081C 00000000 ANDEQ    r0,r0,r0
   S:00000820 00000000 ANDEQ    r0,r0,r0
   S:00000824 00000000 ANDEQ    r0,r0,r0
   S:00000828 00000000 ANDEQ    r0,r0,r0
   S:0000082C 00000000 ANDEQ    r0,r0,r0
   S:00000830 00000000 ANDEQ    r0,r0,r0
   S:00000834 00000000 ANDEQ    r0,r0,r0
   S:00000838 00000000 ANDEQ    r0,r0,r0
   S:0000083C 00000000 ANDEQ    r0,r0,r0

*******************************************************

Can u any one please help me to solve this problem.

Thanks in Advance
Divya

Parents

Martin Weidmann over 12 years ago

Note: This was originally posted on 27th May 2009 at http://forums.arm.com

I suspec the FPU is the cause...

When building for a FPU the generated code will assume the FPU is enabled (and correctly) configurred before you reach the C library initialization. The FPU is disabled out of reset, so it is up to the reset handler

As I'm guessing you don't have a reset handler the FPU will still be disabled when you reach the C library init. The C library init tries to access the FPU, fails and takes an exception. So you end up executing junk.

Try building with "--cpu 7-A" or using the below link to set up the FPU:
[url="http://infocenter.arm.com/help/topic/com.arm.doc.dai0098a/index.html"]http://infocenter.arm.com/help/topic/com.a...098a/index.html[/url]
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Martin Weidmann over 12 years ago

Note: This was originally posted on 27th May 2009 at http://forums.arm.com

I suspec the FPU is the cause...

When building for a FPU the generated code will assume the FPU is enabled (and correctly) configurred before you reach the C library initialization. The FPU is disabled out of reset, so it is up to the reset handler

As I'm guessing you don't have a reset handler the FPU will still be disabled when you reach the C library init. The C library init tries to access the FPU, fails and takes an exception. So you end up executing junk.

Try building with "--cpu 7-A" or using the below link to set up the FPU:
[url="http://infocenter.arm.com/help/topic/com.arm.doc.dai0098a/index.html"]http://infocenter.arm.com/help/topic/com.a...098a/index.html[/url]
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