Dear all, I was reading the LDD3's DMA chapter (chapter 15). The author talks about the splitting of address space between 1GB and 3GB. I couldn't make myself crystal clear as to why it is done. I got even more confused when he said kernel can't access physicalmemory address which is not mapped into kernel space. Why doesn't kernel has full access to all the address space? Thanks Regards --Himanshu -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ