Re: [Xen-devel] Dom0 kernel for Xen4.6 on R-Car H2 (LAGER)

["Ferger, Max" <M.Ferger@xxxxxxxxxx>]

Hello,

No further questions in this message, just a quick wrap-up:
1) Console is now configured.
2) Dom0 kernel is coming up and showing messages.

Very many thanks for all your help!


= Details =

This message should conclude the issue.
Therefore, it summarizes my findings and mistakes, and gets
the actual device tree, and a log entering Dom0 attached.


1) Console is now configured:

It helps to take the exact same console, as the one U-Boot uses,
and to enable it. In case of the LAGER board, it is  "/serial@e6e60000",
configured via the following DT snippet:
----- 8< -----
scif0: serial@e6e60000 {
        status = "ok";
 };
 chosen {
        stdout-path = &scif0;
        xen,xen-bootargs = "console=dtuart dom0_mem=1G";
};
----- 8< -----


2) Dom0 kernel is coming up and showing messages:

> From: Julien Grall [mailto:julien.grall@xxxxxxxxxx]
> Sent: Wednesday, October 21, 2015 8:02 PM
> 
> To be sure, even the patch I attached on the previous mail doesn't help
> you to get the console?

The patch works. But now it is obsolete, and reverted.

My mistake was how I tried to configure the kernel:
Following the OMAP wiki [1], which I think is a little misleading,
I appended the CONFIG_XEN* and friends to .config, and called 'make',
leading to the CONFIG_XEN*-flags to be overwritten by defaults.
Once configured via menuconfig, Dom0 showed messages all right.

> If so, the simplest way to investigate requires the serial driver in Xen
> to be functional (IIRC it's not the case right now). If you got it, you
> can type CTRL-a tree times and access to the Xen console.

This great tool works now.
 
> If you have Xen built with debug=y, from the log you sent it seems to be
> the case, you can use the asm instruction "hvc" to get Xen printing
> useful information:
>     - hvc 0xffff will dump the state of the vCPU
>     - hvc 0xfffd will print the program counter

Nice to know.  Couldn't find it on the wiki, though.

I'll update the LAGER board wiki [2] with my findings.

Some questions remain, but I'll come back on these later,
when I'm more clear about them, and probably via [xen-users].
I'll try my best to abide by the etiquette next time.

Max Ferger

[1] 
http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/OMAP5432_uEVM#2.2_Build_Linux_Dom0_kernel
[2] http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/Lager




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Attachment: log.xen-serial-ok.txt
Description: log.xen-serial-ok.txt

Attachment: r8a7790-lager-xen.dts
Description: r8a7790-lager-xen.dts

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