From mboxrd@z Thu Jan  1 00:00:00 1970
From: Birin Sanchez <birintxo@gmail.com>
Subject: Re: Help on getting serial output on the arndale board
Date: Tue, 18 Jun 2013 13:58:00 +0200
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To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Julien Grall <julien.grall@citrix.com>, xen-devel@lists.xen.org
List-Id: xen-devel@lists.xenproject.org

> 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.
>