Hello, >> MUSB PHY on OMAP3EVM Rev>= E uses external Vbus supply to support >> 500mA of power.We need to program MUSB PHY to use external Vbus >> for this purpose. >> >> Adding 'extvbus' member in musb_config structure which should be set >> by all the boards where MUSB interface is using external Vbus supply. > >Ajay, > >How does the DRVVBUS bit behave on the OMAP3 EVM board on issuing the >'usb reset' command (with musb_cfg.extvbus being set)? OMAP3EVM doesn't use TPS PHY but it has ISP1507 PHY and uses external Vbus And so it needs extvbus programming (musb_cfg.extvbus =1)in OTG_CTRL register. As for as I know it is not needed for boards using usb PHY on TPS device.
> This post has a >few more details, but in short it seems that DRVVBUS is automatically >set by the TPS chip when doing the bus reset: Looks like TPS sets the extvbus and so musb_cfg.extvbus doesn't have Any effect. Ajay > > http://lists.denx.de/pipermail/u-boot/2011-June/095221.html > >(And indeed, on a board with *no* external vbus, setting >musb_cfg.extvbus and reading from a memory stick works just fine.) > >I checked the u-boot in the current DVSDK (4.02.00.06) and the git repo >for u-boot-ti and they all have the same construct. > >Thanks, >Orjan > >-- >Orjan Friberg >FlatFrog Laboratories AB _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot