Re: Blank screen while booting xen

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Mon, Jan 11, 2016 at 12:57:27AM +0530, Harmandeep Kaur wrote:
> Hi,
> 
> I tried to modify and compile some of Xen 4.7's code
> (cloned from git clone git://xenbits.xen.org/xen.git)
> and even with a very minor change (patch included at last)
> my xen failed to boot. It stucks at black blank screen after
> showing some xen logs.

What is on your Linux command line? Do you have 'console=hvc0' ?

> 
> By adding "vga=text-80x80,keep" to the grub before booting
> xen., infinite loop of text
> "(XEN) traps.c:3290: GPF (0000): ffff82d0801af4d5 -> ffff82d080240e5a"
> appears.
> 
> I tried to compile and boot xen reverting the change, but
> same issue still exists.
> 
> Also I tried to setup serial console but my output is garbled.
> More info on it here,
> http://lists.xenproject.org/archives/html/xen-devel/2015-12/msg02045.html
> 
> I tried different software (cu, gtkterm), different baud rates,
> different serial-USB cable and stopping modemmanager,
> but no luck.

How did you set the baudrate? I usually do 'screen /dev/ttyUSB0 115200 cs8'
?

> 
> I am using i3-6100 processor, if that info is needed.I will
> appreciate any help.

dmesg | grep tty

and lspci

could also help?

> 
> Regards,
> Harmandeep Kaur
> Outreachy Intern
> 
> -----------------------------------------------PATCH---------------------------------------------
> >From c814c4ac0028bdef0082561ad6cd69570502c3ba Mon Sep 17 00:00:00 2001
> From: Harmandeep Kaur <write.harmandeep@gmail.com>
> Date: Tue, 29 Dec 2015 22:23:21 +0530
> Subject: [PATCH] First mod
> 
> Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
> ---
>  xen/common/sched_credit.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
> index 0dce790..b395501 100644
> --- a/xen/common/sched_credit.c
> +++ b/xen/common/sched_credit.c
> @@ -1148,6 +1148,8 @@ csched_dom_init(const struct scheduler *ops,
> struct domain *dom)
>  {
>      struct csched_dom *sdom;
> 
> +printk("XXX Hello, this is my first mod :) \n");
> +
>      if ( is_idle_domain(dom) )
>          return 0;
> 
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