Re: [Fastboot] [CFT] ELF Relocatable x86 and x86_64 bzImages

[ebiederm@xmission.com (Eric W. Biederman)]

Don Zickus <dzickus@redhat.com> writes:

>> >> 
>> >> I'm a little disappointed but at this point it isn't a great surprise,
>> >> the code is early yet and hasn't had much testing or attention.
>> >> I wonder if I have missed something else silly.
>> >> 
>> >> As for testing, can you use plain kexec to load the kernel at a
>> >> different address?  I'm curious to know if it is something related
>> >> to the kexec on panic path or if it is just running at a different
>> >> location that is the problem.
>> >
>
> I think I have found the 'something silly'.  Here is a patch that allows
> our Dell em64t boxes to boot.  This change matches the original code.  The
> main difference that caused the problems was the setting of _PAGE_NX bit.
> This caused issues in early_io_remap().  
>
> Thanks to Larry Woodman for debugging this.  

This looks like a different one but looks fairly sane.  

Do you know what code had problems having _PAGE_NX set.
What are we doing with early_ioremap the requires execute
permissions.  It doesn't sound right that we would need
this.

Eric
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