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OpenMAX with gcc

David Moreno Montero
Prodigy 10 points


Hi,

For a project I'm working on I need to use some fast FIR, and OpenMAX implements it. But I am using the gcc toolchain (CodeSourcery). 

Has anyone managed to compile OpenMAX with gcc? Is there any gcc-compatible version?

With gcc compatible I mean NEON assembler optimized, as I need it to be fast.

If I use armcc evaluation to compile it, can it be used later from gcc?

Thanks

 

  • 0
    TI__Expert 5960 points

    Hi David,

    We've looked at this issue maybe a year ago.  We found that you can not compile the NEON assembly based Openmax using gcc.  Since ARM uses a different syntax for their assembly file format, it is not compatible. However we were able to compile the libraries using armcc.

    We used an app note from ARM #178 - Building Linux Applications Using RVDS 3.1 and the GNU Tools and Libraries.

     

    This is what we did after reading through App Note #178.

     

    Running under Linux

    Once you have downloaded the OpenMAX libs developed by ARM, you can edit the PERL build scripts and build the libraries.

    Just replace the CC_OPTS as shown below: 

    $CC_OPTS  = '--no_unaligned_access --cpu Cortex-A8 -c';

    With these CC_OPTS: 

    $CC_OPTS  = '--no_unaligned_access --dwarf2 --debug --asm --interleave --gnu --signed_bitfields 
--no_hide_all --library_interface=aeabi_glibc --cpu=Cortex-A8 --fpu=SoftVFP+VFPv3 -Otime --vectorize 
--enum_is_int --wchar32 --remarks --asm -O3 -c';

    

    Also to get NEON to work as efficiently as possible, you may want to align data buffers to 32 byte boundaries.
    

    

     
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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						in reply to Jeff L
					
									
    
	
    
	                                    
                      
    
                        
                          Expert
                        1215 points
                      
    
                          
                   		
		
    
					
    Hi, 
    

    I tried this when building openMax using armcc in DS-5. When I tried to link with GCC code, I got a lot of this
    

    /usr/local/DS-5/sw/gcc/bin/../lib/gcc/arm-none-linux-gnueabi/4.5.1/../../../../arm-none-linux-gnueabi/bin/ld: error: /mnt/hgfs/F/home/openmax/OX002-BU-00010-r2p0-00rel0/lib/libomxSP.a(omxSP_FFTFwd_CToC_SC16_Sfs_s.o) uses VFP register arguments, ds5-gcc-test does not
    

    Any idea?
    

    Thanks
    

     
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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													0
							
			
				
									
							
						
				
			
			
			
												
						in reply to yl
					
									
    
	
    
	                                    
                      
    
                        
                          Expert
                        1215 points
                      
    
                          
                   		
		
    
					
    
Hi,

    The VFP issue has been solved, and now getting errors of Object has vendor-specific contents that must be processed by the 'ARM' toolchain like this

    /usr/local/DS-5/sw/gcc/bin/../lib/gcc/arm-none-linux-gnueabi/4.5.1/../../../../arm-none-linux-gnueabi/bin/ld:
 error: 
/mnt/hgfs/F/home/openmax/OX002-BU-00010-r2p0-00rel0/lib/libomxSP.a(omxSP_FFTFwd_CToC_SC16_Sfs_s.o):
 Object has vendor-specific contents that must be processed by the 'ARM'
 toolchain /usr/local/DS-5/sw/gcc/bin/../lib/gcc/arm-none-linux-gnueabi/4.5.1/../../../../arm-none-linux-gnueabi/bin/ld:
 failed to merge target specific data of file 
/mnt/hgfs/F/home/openmax/OX002-BU-00010-r2p0-00rel0/lib/libomxSP.a(omxSP_FFTFwd_CToC_SC16_Sfs_s.o)
    



    Any idea how I could solve this? 

    Thanks

    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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