Re: [ppc patch] grub-mkimage

[Marco Gerards <metgerards@student.han.nl>]

Hollis Blanchard <hollis@penguinppc.org> writes:

> On Dec 3, 2004, at 10:10 AM, Marco Gerards wrote:
>>
>>>> AS Hollis said, I'm working on the relocator for PPC at the moment.
>>>> It is quite easy, but PPC_REL24 is a bit more complex.  It is used
>>>> for
>>>> relative jumps.  That means the module should be loaded close to
>>>> grubof, which IMHO really sucks...
>>>
>>> 24-bit offsets give you a 16 MiB range, is that really a problem?
>>
>> The modules are loaded into the free memory of grubof.  And grubof is
>> loaded to where it is linked, IIRC.  So I think that would cause
>> problems. :)
>
> I don't understand this. By "free memory of grubof" do you mean the
> heap? Right now, grubof is linked and loaded at 0x200000 (size is
> ~100KiB right now), and uses memory from 0x4000 to 0x200000 as heap
> space. That means the heap is well within the 16MiB 24-bit offset
> range.

Ok, cool.  In that case there is no problem.  I thought that you
changed init.c so it adds all free memory.  In that case it could
cause problems if you have a few hundreds of megs of memory.  Perhaps
we just discussed this and the change was never made.

Thanks,
Marco