From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Jander Date: Wed, 9 May 2012 11:31:36 +0200 Subject: [U-Boot] [resent] New chapter in i.MX51 datasheet an issue? In-Reply-To: <201205081451.52689.marex@denx.de> References: <20120504120845.4f0e59ea@archvile> <4FA8DD52.6090001@denx.de> <20120508140622.737b0fb1@archvile> <201205081451.52689.marex@denx.de> Message-ID: <20120509113136.08149af6@archvile> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Tue, 8 May 2012 14:51:52 +0200 Marek Vasut wrote: > Dear David Jander, > > > On Tue, 08 May 2012 10:46:10 +0200 > > > > Stefano Babic 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.