[U-Boot] [PATCH] USB: add CONFIG_USB_INIT to autoinitialize USB before main_loop

[Allen Martin]

> > > > The point is to be able to use USB keyboard to stop autoboot on
> > > > systems where USB keyboard is the primary (or only) input device.
> > > > This needs to happen before BOOTCOMMAND gets parsed.
> > >
> > > I think the "preboot" environment variable already *is* run before
> > > starting the autoboot timer?
> >
> > Yep.
> >
> 
> I also had to stick it before console init because console makes
> decisions about the input device based on what's been registered when it
> initializes (at least with iomux turned on, I didn't try it without).
> 
> Maybe a better fix is to have console reevaluate things when the usb
> keyboard driver registers itself?  I'm open to suggestions.

I don't fully grok how console/stdin gets assigned, but is this possibly
the problem? (from drv_usb_kbd_init()):

                /* Check if this is the standard input device. */
                if (strcmp(stdinname, DEVNAME))
                        return 1;

                /* Reassign the console */
                if (overwrite_console())
                        return 1;

                error = console_assign(stdin, DEVNAME);

This seems incompatible with iomux, shouldn't these decisions be made in the
console driver?  In my case, stdin is set to "serial,tegra-kbc,usbkbd" so this
strcmp won't match.

-Allen
nvpublic