Re: [Xen-devel] Blank screen while booting xen

[Harmandeep Kaur <write.harmandeep@xxxxxxxxx>]

On Mon, Jan 11, 2016 at 11:36 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Mon, Jan 11, 2016 at 11:15:43PM +0530, Harmandeep Kaur wrote:
>> On Mon, Jan 11, 2016 at 11:00 PM, Konrad Rzeszutek Wilk
>> <konrad.wilk@xxxxxxxxxx> wrote:
>> > On Mon, Jan 11, 2016 at 10:56:07PM +0530, Harmandeep Kaur wrote:
>> >> On Mon, Jan 11, 2016 at 8:23 PM, Konrad Rzeszutek Wilk
>> >> <konrad.wilk@xxxxxxxxxx> wrote:
>> >> > 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' ?
>> >> my /etc/defaults/grub   http://paste2.org/BkOOOskh
>> >> my /boot/grub/grub.cfg http://paste2.org/Ks49MZEh
>> >> >
>> >> >>
>> >> >> 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 also tried the same with screen just without the cs8 keyword.
>> >>
>> >> >>
>> >> >> I am using i3-6100 processor, if that info is needed.I will
>> >> >> appreciate any help.
>> >> >
>> >> > dmesg | grep tty
>> >>
>> >> $ dmesg | grep tty
>> >> [       0.000000] console [tty0] enabled
>> >> [       4.537790] systemd[1]: Created slice system-getty.slice.
>> >> [11542.458553] usb 1-4: pl2303 converter now attache
>> >
>> >
>> > This is on your box with the USB dongle. I meant the other one.
>> >
>> here it is
>> $ dmesg | grep tty
>> [    0.000000] console [tty0] enabled
>> [    0.786850] 00:04: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200)
>> is a 16550A
>>
>> > Maybe we should step back a bit. On the machine on which you
>> > want to install Xen - does it work if you install say
>> > Fedora Core 23 and after installing, you do 'yum install xen' ?
>> > Can you boot with that? Then at least we will know whether an
>> > packaged version of Xen works on your machine.
>>
>> Yes, it works. I tried that with xen 4.5 on Ubuntu 15.10.
>> Also, even my compiled version(4.7) used to run before
>> my modification.
>
> OK, so I would suggest you try again with the serial console but
> using the non-modified hypervisor version. See if you can get the serial to 
> work.

Tried that. Still same issue. Maybe hardware is malfunctioning.

> I would suggest you use screen as the other (cu, minicons) - I had issues
> with them with USB devices. While screen also allows you to log them.

Tried cu and gtkterm

> And do please check that you have 'console=com1 com1=115200,8n1 loglvl=all' on
> your Xen command line. And on Linux 'console=hvc0'.

Checked. All set.

> Once you have the serial working with the un-modified version I would
> try the modified and see where it gets stuck.

I will get getting new cables. See if new ones solve the issue.

Thanks for the help.

Regards,
Harmandeep Kaur

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel