memcpy, altera dma and tests...

Hi FP,

I have tried to do the memcpy by an alt_dma. However even if I flush and clear the cache, the system is very unstable. It freeze after I launch a telnet connection for exemple.

If a Guru can have a look to my function below, it would be great !!!

void *memcpy_dma(void *dstpp, const void *srcpp, int length)	
{
	unsigned int dst = (unsigned int) dstpp;
	unsigned int src = (unsigned int) srcpp;
	unsigned int len = (unsigned int) length;
	
	flush_dcache_range(src,src+len);
	outl(CT_RESET,na_dma_memcpy + REG_DMA_CONTROL);
	outl(CT_RESET,na_dma_memcpy + REG_DMA_CONTROL);
	
	outl(src,na_dma_memcpy + REG_DMA_READADDR);
	outl(dst,na_dma_memcpy + REG_DMA_WRITEADDR);
	outl(len,na_dma_memcpy + REG_DMA_LENGTH);
	outl(CT_BYTE+CT_GO+CT_LEEN,na_dma_memcpy + REG_DMA_CONTROL);
	while ((inl(na_dma_memcpy+REG_DMA_STATUS) & ST_DONE) != ST_DONE) udelay(1);
	
	outl(0,na_dma_memcpy + REG_DMA_CONTROL);
	outl(0,na_dma_memcpy + REG_DMA_STATUS);
	cache_clear(dst,len);
	return (dst+len);
}

Bye !!!!