Re: [XenPPC] Booting xen_maple_defconfig kernel on bare hardware

[Maria Butrico <butrico@xxxxxxxxxxxxx>]

Amos Waterland wrote:
> It would be nice to boot the exact same Linux kernel binary image on
> bare hardware and as a Xen dom0 on that same hardware.  At present we
> cannot do this: you stop seeing output early in the boot process.
>
> I spent some time using OF output routines to track down the problem,
> and it turns out that CONFIG_XEN_DISABLE_SERIAL=y disables all standard
> serial device drivers.  So when you boot a kernel compiled with
> CONFIG_XEN on bare hardware you stop seeing any output after the RTC is
> probed, but the real problem occurs much later when Linux panics because
> it can't open an initial console.
>
> The below patch (not for submission) allows the same Linux kernel image to
> boot as a dom0 and on bare JS20 hardware.  Note that this patch applies on
> top of the "refresh xen_maple_defconfig" patch sent earlier.
>
> The reason it is not for submission is that while it boots on bare JS21
> hardware, it fails to boot as a dom0 on the same hardware.  The console
> spews a lot of garbage characters and external networking never comes up.
>
> So CONFIG_XEN_DISABLE_SERIAL probably needs turn on some intelligent
> runtime probing of whether we are running on bare hardware or on Xen.
> If the former, do nothing, if the latter, remove the serial devices from
> the list of available consoles.  No?
>
>   
On our js20 (kpblade4, for those at watson) where I managed to install 
SLES10 I was able to boot the xen kernel with the modification indicated 
by Amos using the sles10 rootfs from disk.  A few things failed, but 
overall it was better than expected.  I built the linux kernel with the 
following configuration.
CONFIG_CMDLINE_BOOL=y
CONFIG_CMDLINE="root=/dev/hda3 
ip=9.2.129.5::9.2.129.2:255.255.255.0:kpblade4:eth1:off"


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