On Tue, 8 May 2012 14:51:52 +0200 Marek Vasut <ma...@denx.de> wrote: > Dear David Jander, > > > On Tue, 08 May 2012 10:46:10 +0200 > > > > Stefano Babic <sba...@denx.de> wrote: > > > On 07/05/2012 09:11, David Jander wrote: > > > > Dear Stefano, > > > > > > Hi David, > > > > > > > Yes, but is none of those boards using 3.15 or 3.3V? If they are, those > > > > bits must be cleared! > > > > > > This is a good question - also because SD was tested and it is working > > > on these cards. I am asking to myself how it can work if voltage is > > > wrong. > > > > That is the whole point: You probably won't notice anything with the wrong > > settings.... besides slightly lower drive-strength on the pin. Things > > should just work with either setting. The problem is that now Freescale is > > telling us that using the incorrect settings can cause "permanent damage" > > to the chip!!! No idea what sort of damage nor whether it occurs > > frequently..... > > I think it might have something to do with ESD. It's probably unlikely to > happen > anyway.
Why do you think that? ESD protection is not something that could possibly have something to do with a running board and wrong PAD configuration bit settings. Or do you mean that IO-pad ESD protection is the thing that gets destroyed by wrong settings? AFAICS, this bit probably enables and disables a different set of output transistors on the pad. Whether damage is likely to happen or not, is not clear to me yet. I am waiting on a reply from Freescale about this issue right now. I will post any important findings here as soon as I know more. Best regards, -- David Jander Protonic Holland. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
