On Mon, Aug 27, 2018 at 09:47:41AM +0200, Michael Grzeschik wrote: > On Fri, Aug 24, 2018 at 05:18:02PM -0300, Fabio Estevam wrote: > > Hi Michael, > > > > On Fri, Aug 24, 2018 at 4:55 PM, Michael Grzeschik <mgr@xxxxxxxxxxxxxx> wrote: > > > > > I get that it is not safe to toggle bits if the clock is not > > > there. We could check for the bootsource. Is it possible to > > > ensure that we are started by imx-usb-loader? > > > > It is possible to determine if we have started via USB download mode. > > > > Check the is_boot_from_usb() implementation in U-Boot for a reference. > > Right, So it seems to be safe to reach for the phys registers on mx6. > > On mx5 and similar we have a nop phy and the only way to > communicate with it is through usbmisc, which is also in the > register space that leads to a hang if one clock is missing. > > I will search for another solutions on those SoCs. It's not necessary to ask for the bootsource. You just have to enable the clocks necessary to access the USB registers. Or the other way round: When the clocks are not enabled already, you could assume we have not booted from USB. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
