Re: [Xen-users] Fw: booting

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-02-06 at 21:55 +0800, IAN DELANEY wrote:
> On Thu, 6 Feb 2014 11:42:26 +0000
> Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:

> > When you say "monitor" do you mean the VGA/HDMI output? I've never
> > used that -- all my experience is with the serial console for which
> > "console=ttyS0,115200" on the kernel command line is sufficient IME.
> > 
> 
> This makes it awkward.  Steev the gentoo arm dev himself is urging me
> to acquire a usb adaptor so as to get a serial console.  I've tried
> twice now with a local supplier and Perth/Australia it appears just
> doesn't have 'em!!!!!  Can't even source a supplier, any supplier.
> They're around $10 U.S. ordered online and would then take a few weeks
> for delivery.  By monitor, I mean the screen of the AOC or Samsung
> SyncMaster226BWW, plugged into the video input in the tower (the case)
> housing my amd64 motherboard, which is I believe VGA/HDMI output.
> Welcome to Perth W.A., aka endsville! :) /me would really like a serial
> console!!!

FWIW it takes about the same cost/time to get one here in the UK. I
ordered one 3 weeks ago and it still isn't here, I'm not expecting it
for another few weeks (I probably should have paid more attention to the
delivery time, I'm sure I could have done better)

> > I'm not sure of the GFX stuff is supported by mainstream kernels or
> > not.
> > 
> 
> strooth

I forgot to say that Xen itself doesn't have any graphics stuff for this
platform at all.

> > > 3. Can you double check this for me?
> > > # Load Linux arch/arm/boot/zImage to ${kernel_addr_r}
> > > bootz ${xen_addr_r} - ${fdt_addr}
> > > 
> > > My limited understanding makes me think it ought be
> > > bootz ${kernel_addr_r} - ${fdt_addr}
> > 
> > Is this in the context of booting Xen or Linux?
> > 
> 
> Well, either or.   It's your suggestion to cut out the xen.gz and just
> go for the kernel.  As I say, it appears to be booting since the green
> diode comes on and stays on.  A flashing of green or blue indicates, I
> believe, something has pulled up and failed.  Blind without a serial
> console output.

I think you are pretty much stuffed without a serial console... How are
you interacting with u-boot? I guess by writing boot scripts to an
sdcard using another system?

About the only halfway sensible suggestion I have is to investigate
Linux's network console stuff, that won't get you u-boot or Xen output,
but dom0 or native Linux should be able to spit something out.
linux/Documentation/networking/netconsole.txt explains it. I'd recommend
getting it working on a PC or something where you can see the real
console too first to make sure you have the bits fitted together.

My experience of that is limited to what is recorded in
http://www.hellion.org.uk/blog/posts/debugging-initramfs-over-netconsole/ (and 
I barely remember doing it).

>   You text following here I will pursue tomorrow.

Ack.

Ian.


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