Re: [PATCH 0/2] efi: Enhance capsule loader to support signed Quark images

[Bryan O'Donoghue]

On 28/02/17 17:42, Bryan O'Donoghue wrote:
> On 28/02/17 17:18, Andy Shevchenko wrote:
> > On Tue, Feb 28, 2017 at 6:52 PM, Bryan O'Donoghue
> > > A kernel compiled like this
> > >
> > > make menuconfig ARCH=i386
> >
> > I hope you care that it is equivalent to
> >
> > make menuconfig ARCH=i686
> >
> > > make bzImage -j 8
> > >
> > > will run just fine on Quark x1000 I do it regularly. CPUID ought to (and
> > > does) inform the runtime kernel of what to do re: MSRs etc.
> > >
> > > We won't execute xmm/mmx, we won't touch 686 specific MSRs etc, etc.
> >
> > It is i*6*86 code still.
> >
> > So, summarize, you state that
> > 1. CONFIG_SMP=y and
> > 2. CONFIG_M686=y and
> > 3. Kernel works on Quark
> >
> > Is it correct?
>
> Logically yes. It's a very long time since I looked in detail. No harm
> in checking it out though.
>
> I'll compile up the above kernel this evening (GMT) and verify.

CONFIG_SMP=y - no difference - like I say it's PF# on lock prefix
               instructions, not SMP=y that's the problem here
CONFIG_M686=y (doesnt' boot)
CONFIG_M586TSC=y does boot

So yes M686 is not bootable on this part. My point to you about having a 
custom kernel though still stands, you shouldn't have to compile a quark 
specific kernel - just a 586TSC kernel with Quark support.

For example CentOS is bootable on Quark.


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bod