Re: [Xen-devel] Help on getting serial output on the arndale board

[Birin Sanchez <birintxo@xxxxxxxxx>]

> Do you have a dtuart=<something> in your Xen bootargs (in the dtb)?
>
> This is mentioned in
> http://wiki.xen.org/wiki/Xen_ARMv7_with_Virtualization_Extensions
> but not
> http://wiki.xen.org/wiki/Xen_ARMv7_with_Virtualization_Extensions/Arndale
>
> If you are using the dts from Julien's Linux tree it should have this
> already, so maybe this is a red herring but I'd have expected the logs
> to contain
>          "Looking for UART console %s\n", devalias);
> from dt_uart_init() and they don't.
Yes. arch/arm/boot/dts/exynos5250-arndale.dts contains this:

chosen {
                bootargs = "dom0_mem=256M sync_console console=dtuart 
dtuart=serial0";
                xen,dom0-bootargs = "console=hvc0,115200n8 debug 
root=/dev/mmcblk1p2 ignore_loglevel rw rootwait earlyprintk=xen";
                modules {
                        module@0 {
                                compatible = "xen,linux-zimage", 
"xen,multiboot-module";
                                reg = <0x60000000 0x400000>;
                        };
                };
        };

and serial0 is an alias:

serial0 = "/serial@12C20000";

I guess that's OK.


> I find that the build system is not great at picking up changes to the
> DTB, I habitually rm xen/arch/arm/dtb.o before rebuilding Xen.
I did 'make distclean' every time before compiling again. Checking the 
date on dtb.o shows same date as the generated xen-uImage.
I will compile against every change in 
arch/arm/boot/dts/exynos5250-arndale.dts to see if I can find what made 
it stop working.
Also I recently upgraded to Ubuntu 13.04 could this be the issue?

Birin

> Ian.

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