From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Wed, 23 May 2012 15:08:11 +0200 Subject: [U-Boot] [PATCH 3/3] M28: Disable USB power on boot In-Reply-To: References: <1337729574-30475-1-git-send-email-marex@denx.de> <201205231353.12592.marex@denx.de> Message-ID: <201205231508.11693.marex@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Dear Fabio Estevam, > On Wed, May 23, 2012 at 8:53 AM, Marek Vasut wrote: > > Dang, this must be related to bootrom somehow then. Fabio, can you > > confirm the following: > > > > If you turn off the mx28 board, connect usb flashdisc, turn it on -- do > > you see the flashdisc led blinking? Any idea what might cause it? This > > patch forced the VBUS off, so very early in uboot, the USB flash has no > > way to blink (unless there's some surge). > > I have just tried it on my mx28evk and I don't see the USB thumb LED to > turn on. > > Only if I do a "usb reset" that it turns on. Doing a "usb stop" turns > it off as expected. > > I would suggest you to compare your USB circuitry against mx28evk > schematics. Well, what can it be caused by? I disabled the VBUS, so how come it can still be on. The usb circuitry maybe then? > Regards, > > Fabio Estevam Best regards, Marek Vasut