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Malloc SPARERAM, for mem2mem function

speedyisfast (2)
Hi, Members of cplusplus
I hope you can help me.
I have maked some new program.
I need some dynamicly spareram , but i have tryed it, but no luck.

This is my code
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memory_tmp = (unsigned char*)mmap(0, DMA_BLOCKSIZE + 0x1000, PROT_READ|PROT_WRITE, MAP_SHARED, mem_fd, SPARE_RAM);
	    if (memory_tmp == MAP_FAILED) {
	        printf("[grabber] mmap failed\n");
	        blank = true;return false;
	    }
		        	
        volatile unsigned long *mem_dma;
	    if(!(mem_dma = (volatile unsigned long*)mmap(0, 0x1000, PROT_READ|PROT_WRITE, MAP_SHARED, mem_fd, (stb_type == BRCM7400) ? 0x10c02000 : 0x10c01000)))
	    {       
            if(m_debug){
			    fprintf(stderr, "[Debug] Mainmemory: <Memmapping failed> DMA control\n");
			    blank = true;return false;
		    }
	    }

	    for (i=0; i < tmp_size; i += DMA_BLOCKSIZE)
	    {
            unsigned long *descriptor = (unsigned long*)memory_tmp;

            if (i + DMA_BLOCKSIZE > tmp_size)
                tmp_len = tmp_size - i;
			
            descriptor[0] = /* READ */ adr + i;
            descriptor[1] = /* WRITE */ SPARE_RAM + 0x1000;
            descriptor[2] = 0x40000000 | /* LEN */ tmp_len;
            descriptor[3] = 0;
            descriptor[4] = 0;
            descriptor[5] = 0;
            descriptor[6] = 0;
            descriptor[7] = 0;
            mem_dma[1] = /* FIRST_DESCRIPTOR */ SPARE_RAM;
            mem_dma[3] = /* DMA WAKE CTRL */ 3;
            mem_dma[2] = 1;
            while (mem_dma[5] == 1)
                usleep(2);
            mem_dma[2] = 0;
        }
			
	    munmap((void *)mem_dma, 0x1000);
	    memory_tmp += 0x1000;


I have tryed it with malloc, but with no luck.
I need 4mb 4x1024x1024.

i have tryed this
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 unsigned char *memread;
        memread = (unsigned char*)malloc(4*1024*1024); //4 MB is enough...
        if(!memread){
            printf("unable to allocate size \n");
        }else{
            //printf("SPARE_RAM: the base of allocation is %p \n",SPARE_RAM);
            printf("memread  : the base of allocation is %p \n",memread);
            
        }
        unsigned long int SPARE_RAM = (unsigned long int)memread;
        free(memread);


Now the question is, how to use in this memory2 memory code.
I hope someone can helpme.
P.s sorry for my bad english.

Gr Sp
Last edited on
Moschops (7244)
In what way is there "no luck"? Does it not work? Does your code not compile? Do you get any error messages?
speedyisfast (2)
Hi,

It won't start, then hanging. then i must reboot the whole box
It's for a satelittetuner mipselbased.

I can use 252*1024*1024, this is working.
But this memory wil be overwritten when i do a recording on the box.
So i need dynamic mem.

Kind regards Martijn
Last edited on
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