On Tue, Apr 21, 2020 at 05:09:47PM +0800, 王文虎 wrote:

Hi, Greg, Arnd,

Thank you for your comments first, and then really very very very sorry
for driving Greg to sigh and I hope there would be chance to share Moutai
(rather than whisky, we drink it much, a kind of Baijiu), after the virus.

Back to the comments, I'd like to do a bit of documentation or explanation first,
which should have been done early or else there would not be so much to explain:
1. What I have been trying to do is to access the Freescale Cache-SRAM device form
user level;
2. I implemented it using UIO, which was thought of non-proper;

I still think that using uio is the best way to do this, and never said
it was "non-proper".  All we got bogged down in was the DT
representation of stuff from what I remember.  That should be worked
through.

thanks,

greg k-h