Comment 183 for bug 930447

I have 2 or three pentium m systems to test on. may i help out with testing
sodudus? (I have ibm thinkpad x41, t41, and maybe a t40 that only works on
power cord/battery one or other)

On Sun, May 19, 2013 at 12:51 PM, sudodus <email address hidden> wrote:

> On 2013-05-19 19:22, Chris Bainbridge wrote:
> >> The reason why I want people to
> >> check the address size is the we are working around the check, that
> >> should make it impossible to boot a non-pae CPU with a pae kernel.
> >
> > Fake -PAE bypasses the check to stop dpkg installing a PAE kernel. But,
> > even after that, the PAE kernel won't boot on a non-PAE CPU. PAE is not
> > something that gets enabled (or disabled) at runtime, it is actually a
> > replacement of functions in the kernel source (#ifdef .. #endif etc.),
> > so if you have a PAE kernel it will not boot on non-PAE. So it makes no
> > sense to ask people to check the address size on a CPU that has already
> > booted a PAE kernel, since the fact that it successfully booted a PAE
> > kernel means it must support PAE. (afaik - this is from the
> > documentation, I do not have a non-Pentium-M non-PAE system to test
> > with)
> >
> I see your point. I will look for some links, that support what you say,
> and change the text accordingly. If you have a link available, please
> send it to me :-)
>
> Can you explain why the non-pae ubuntu code reports 32 bits physical
> memory, while the pae code reports 36 bits? Some people say it should
> report the same. But there is a difference on the computers I have tested.
>
> -o-
>
> If it is the general truth that non-pae CPUs won't boot at all, it is
> even harder to understand why the Pentium M CPUs are excluded by the
> Ubuntu developers. Why are those tests implemented (in syslinux), or why
> are they shutting down, and not only printing the message?
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (1058748).
> https://bugs.launchpad.net/bugs/930447
>
> Title:
> Unable to start Ubuntu 12.04 live CD with syslinux loader on Pentium M
> x86 Laptop due to bug in PAE kernel, initramfs or syslinux
>
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