[PATCH 06/14] ARM: kirkwood: convert uart0 to devicetree.
Jason
jason at lakedaemon.net
Thu Mar 8 08:29:24 EST 2012
On Wed, Mar 07, 2012 at 09:13:04PM +0000, Arnd Bergmann wrote:
> On Wednesday 07 March 2012, Jason wrote:
> > Grrr. Now I'm getting frustrated. I'm trying to boot without
> > earlyprintk. Evidently, something is wrong with the above, because the
> > device boots all the way up (blinky lights come on), but I get no
> > messages after the usual "Uncompressing Linux... done, booting the
> > kernel."
> >
> > Here's my most recent attempt:
> >
> > serial at f1012000 {
> > device_type = "serial";
> > compatible = "ns16550a";
> > reg = <0xf1012000 0x100>; /*phys addr*/
> > virt-reg = <0xfed12000>; /*virt addr*/
> > reg-shift = <2>;
> > reg-io-width = <1>;
> > interrupts = <33>;
> > current-speed = <115200>;
> > interrupt-parent = <&intc>;
> > clock-frequency = <200000000>;
> > };
> >
> > I've looked at what is done in the powerpc dt's, but, no luck. When
> > earlyprintk is enabled, I see no error messages, just:
> >
> > bootconsole [earlycon0] enabled
> > debug: skip boot console de-registration.
> > ...
> > Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled
> >
> > Any pointers?
> The of_serial driver (you did enable that one in Kconfig, right?)
Wow. I can't believe I missed that. I now get:
Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled
f1012000.serial: ttyS0 at MMIO 0xf1012000 (irq = 33) is a 16550A
console [ttyS0] enabled
without earlyprintk.
Thanks, Arnd.
Jason.
PS - the only change from your code is the 0x100. I'm going to do some
more testing...
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