On Fri, May 17, 2013 at 10:18:39AM +0200, Juergen Beisert wrote: > The boot source for the i.MX23 is configured via a few GPIOs, which are later > be used for different purposes (like LCD data for example). The SoC internal > ROM reads these GPIOs and uses the selected boot source. > > For various reasons the boot source is also of interest when Barebox is running. > This detection approach reads again the GPIOs. It switches temporarily the pins > to act as GPIOs and input, reads their values, and switches back to their > previous functions. > > Could this be a reliable way to detect the boot source? I don't know. Are the bootstrap pins used as outputs only in the normal usecase? Otherwise I could imagine that something is overriding the bootstrap pins by the time you read them. > > BTW: is there a reason why the bootsource will create environment variables, > while other detected features find their way to the "global" device? No, at least not a good one ;) > +static uint32_t mxs23_boot_save_loc(void) Should you continue working on this please change the name to something like mx23_get_bootsource(). This function does not save anything. 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
