Hi guys, On Mon, Sep 27, 2010 at 1:47 AM, luca ellero wrote: ...snip... > IIRC ARM architecture doesn't map RAM at physical address 0 (like x86 does). > It maps it at address 0x80000000, 0xC0000000 or some other address, leaving > 0 for flash, ROM or something else. It depends on arch. > So maybe the problem here is that the cycle have to start from a well > defined page frame number and not at 0. The code has to be modified at some > points. > Take this like a hint, at the moment I have no ARM boards at hand so I can't > help you further. I can definitely confirm that not all ARM processors start their RAM at physical address zero. If you have a kernel module (or you can rebuild your kernel to add a printk), you can have it print out the 4 bytes at virtual address 0xC0004000. The top 3 nibbles of this first word will be the top 3 nibbles of the physical address of your first page of memory. So, something like: printk( "0x%08x\n", *(uint32_t *)0xc0004000 ); -- Dave Hylands Shuswap, BC, Canada http://www.DaveHylands.com/ -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
