Hi, Linux Device Drivers, 2nd edition mentions following things about "remap_page_range()" : ----------------------------------------------------------------------------------------------------------- An interesting limitation of remap_page_range is that it gives access only to reserved pages and physical addresses above the top of physical memory. Reserved pages are locked in memory and are the only ones that can be safely mapped to user space; this limitation is a basic requirement for system stability. Therefore, remap_page_range won't allow you to remap conventional addressesâwhich include the ones you obtain by calling get_free_page. ----------------------------------------------------------------------------------------------------------- what I understood of this is, RAM address can't be remapped to some virtual address using remap_page_range() function..... is this right? If it is right, then how come the frame buffer driver (/drivers/video/fbmem.c) uses this function to map the virtual address to the physical one (which is a RAM address)? Thanks in advance for your answer. Sandeep - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
