Re: Trying to boot on Arndale Board.

[Anthony PERARD <anthony.perard@citrix.com>]

On 14/02/13 15:09, Sander Bogaert wrote:
> Hi,
> 
> I'm trying to get Xen working on the Arndale Board

Hi, thanks for trying :).

> using these
> instructions:
> http://wiki.xen.org/wiki/Xen_ARMv7_with_Virtualization_Extensions/Arndale

Sorry, this wiki page is probably not complete yet.

> When trying to build the Linux kernel from Linaro,
> http://git.linaro.org/gitweb?p=people/ronynandy/linux_stable.git;a=shortlog;h=refs/heads/lue_arndale_3.7
> (
> configured as specified on the Xen wiki page ) I run into the following
> error while compiling:
> 
> *drivers/xen/xenbus/xenbus_client.c: In function
> 'xenbus_map_ring_valloc_hvm':*
> *drivers/xen/xenbus/xenbus_client.c:532:9: error: implicit declaration of
> function 'page_to_section' [-Werror=implicit-function-declaration]*
> *cc1: some warnings being treated as errors*
> *make[3]: *** [drivers/xen/xenbus/xenbus_client.o] Error 1*
>
> I was wondering if anyone else ran into this and if so how best to solve it.

Yes, I've got a patch for it:
diff --git a/drivers/xen/xenbus/xenbus_client.c
b/drivers/xen/xenbus/xenbus_client.c
index bcf3ba4..686142d 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -35,6 +35,7 @@
 #include <linux/spinlock.h>
 #include <linux/vmalloc.h>
 #include <linux/export.h>
+#include <linux/mm.h>
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/page.h>
 #include <xen/interface/xen.h>


> Booting Xen on the board hangs on "Turning on paging", is this related to
> not having a dom0?

Should not be, there is many things printed by Xen before it is trying
to boot dom0, and it would say that it can not find a dom0.

> *...*
> *Startinrrrrrrrrrrrrrrrr- UART enabled -*
> *- CPU 00000000 booting -*
> *- Started in Hyp mode -*
> *- Zero BSS -*
> *- Setting up control registers -*
> *- Turning on paging -*

All right, I've been able to reproduce the behaviour. Are you starting
Xen using the u-boot command "go"? Because this does not work with me.
It gave me some headache sometime ago. The command that works is "bootm
$xen_addr -"
So, I'm curious, how do you start Xen on the board?

Here is what env I have on u-boot:
ipaddr=10.y.y.y
ipconfig=10.y.y.y
kernel_addr_r=0x40007000
serverip=10.x.x.x
tftp_path=10.x.x.x:pxelinux.cfg
usbethaddr=00:40:5c:26:0a:5b
ethaddr=00:40:5c:26:0a:5b
xen_addr_r=0x50000000
bootcmd_load_linux=tftpboot 0x40007000 10.80.3.61:pxelinux.cfg/linux-zImage
boot_xen=run bootcmd_load_linux; tftpboot $xen_addr_r
$tftp_path/xen-uImage; bootm $xen_addr_r -
bootcmd=run boot_xen

with 10.y.y.y the ip addr of the board and 10.x.x.x the ip of a tftp
server (or PXE server).

By the way, I've pushed a new branch: arndale-2013-02-13 which fix few
things.

This should make you pass the "turning on paging" step.

After that, you will probably need few patches for Linux. I'll push them
later.

Have fun,

-- 
Anthony PERARD