[syslinux] Using syslinux to boot xen without initrd

[Ingrid Ribeiro Galvez]

Erwan, I'm using syslinux v3.85

Gene, the kernel was built using buildroot (and I checked that Xen support
was enabled). Didn't try without the menu, will see that now.

Also, I saw a short note on syslinux mboot wiki page: "A really good use
case for this (using mboot.c32) is booting Xen <http://xensource.com>, or
any other hypervisor-based virtualization pieces that also require an
initrd/initramfs. If your Xen boot doesn't require an initrd, then it is
possible to utilize the existing kernel/append method." (
http://www.syslinux.org/wiki/index.php/Mboot.c32) .... I'm not sure what
they mean by "existing kernel/append method" though...

I 've already tried stuff such as:

1)
LABEL Xen Hypervisor
     MENU DEFAULT
     KERNEL ../xen-4.3.2.gz
     APPEND root=/dev/sda1 console=tty0 console=ttyS0,9600 rw loglevel=5

and

2)

LABEL Xen Hypervisor
     MENU DEFAULT
     KERNEL ../vmlinuz-2.6.31.8
     APPEND ../xen-4.3.2.gz root=/dev/sda1 console=tty0 console=ttyS0,9600
rw loglevel=5

But none of this have worked. Hope you guys can help me figure out what I'm
doing wrong.

Thank you very much for your time!

Cheers,

Ingrid

On Tue, Sep 8, 2015 at 10:54 PM, Erwan Velu <erwanaliasr1 at gmail.com> wrote:

> Can you tell us the Syslinux version you use ?
> Le 8 sept. 2015 3:21 PM, "Ingrid Ribeiro Galvez via Syslinux" <
> syslinux at zytor.com> a écrit :
>
>> Hello all,
>>
>> I have a Linux kernel image with Xen compiled  for an embedded system. It
>> doesn't need an initrd as everything required for it to boot is already in
>> the final kernel image, and it works perfectly. But I'm having problems to
>> boot the Xen image without an initrd. I'm following this guideline
>> http://www.syslinux.org/wiki/index.php/Xen for my syslinux configuration
>> file, but without including an initrd. So it looks like this:
>>
>>
>> LABEL xen
>>
>>   MENU DEFAULT
>>   KERNEL mboot.c32
>>   APPEND xen-4.3.2.gz dom0_mem=262144 --- ../vmlinuz-2.6.31.8
>> console=tty0 root=/dev/sda1 ro
>>
>> What happens is that it tries to load but keeps looping back to the
>> bootloader menu. I think it might be expecting the initrd image. Anybody
>> knows how to set the configuration file for xen so it doesn't need an
>> initrd??
>>
>> Thank You!
>>
>> Cheers,
>>
>> Ingrid
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>