On Nov 27, 2007, at 12:41 PM, Stefan Roese wrote:
Hi Kumar,
On Tuesday 27 November 2007, Kumar Gala wrote:
So we have a patch to CFI flash to use DQ7/#data polling instead of DQ6/toggle. There seems to have been some discussion from time to time regard this and several people have reported empirical evidence about how DQ7 appears to work better for them on some systems.
I have to admit, that I don't remember those discussions. Could you please refresh my memory? And why exactly are you implementing this change? What problem does it fix?
http://search.gmane.org/?query=DQ7&group=gmane.comp.boot-loaders.u-boot
I'm told that higher frequencies we have issues using the toggle method on 85xx/86xx parts from freescale. But use DQ7 at those freq seems to work reliable for the flash parts we have on some of the boards.
I was hoping to understand what the issues are with getting such a change accepted.
If your patch fixes a problem, then chances are quite good. :)
BTW: What does Linux MTD do? DQ7/data or DQ6/toggle? (I'm just too lazy to check myself :))
It looks like it just uses DQ6/toggle if I'm reading the code correctly.
- k