Re: How can I test if a physical address is already mapped or not.

unsigned long    * const pReg = (unsigned long*) 0XC0000000 ;

printk( KERN_INFO"** read (%p) %08lX.\n", pReg, *pReg) ;

On any virtual memory processor I am aware of, the above will cause pReg to contain a virtual address, not a physical address. Jeff, I do not follow you... Could you, please be more explicit. Thanks.