Ah, yes of course the virtual address. Thanks for pointing it out! Chan Kim From: Deepanshu Kartikey <kartikey406@gmail.com> Sent: Monday, July 12, 2021 1:48 AM To: ckim@etri.re.kr Cc: kernelnewbies@kernelnewbies.org Subject: Re: ioremap and page table What my understanding is that ioremap converts your address to a virtual address. So, yes everything then is handled by the kernel On Sun, Jul 11, 2021 at 9:04 PM <ckim@etri.re.kr <mailto:ckim@etri.re.kr> > wrote: Hello all, I’m almost sure but want to check if my understanding is correct. To use a memory mapped IO, we use functions like request_mem_region and ioremap, iounmap functions. I guess when we call ioremap function, the kernel sets up page table for the region so that the region becomes non-cacheable, and I don’t also have to worry about reordering problem. Is my understanding correct? Thanks! Chan Kim _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org <mailto:Kernelnewbies@kernelnewbies.org> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies