[PATCH 06/14] ARM: kirkwood: convert uart0 to devicetree.

On Wed, Mar 07, 2012 at 09:13:04PM +0000, Arnd Bergmann wrote:

On Wednesday 07 March 2012, Jason wrote:

quoted

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...