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Re: RFC: Sentosa boot fix

To: "Maciej W. Rozycki" <>
Subject: Re: RFC: Sentosa boot fix
From: Thiemo Seufer <>
Date: Mon, 29 Jan 2007 18:09:53 +0000
Cc: Franck Bui-Huu <>, Daniel Jacobowitz <>,,, Atsushi Nemoto <>
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <>
User-agent: Mutt/1.5.13 (2006-08-11)
Maciej W. Rozycki wrote:
> On Mon, 29 Jan 2007, Franck Bui-Huu wrote:
> > > The problem is __pa_symbol(&_end); the kernel is linked at
> > > 0xffffffff80xxxxxx, so subtracting a PAGE_OFFSET of 0xa800000000000000
> > > does not do anything useful to this address at all.
> > >
> > 
> > In my understanding, if your kernel is linked at 0xffffffff80xxxxxx,
> > you shouldn't have CONFIG_BUILD_ELF64 set.
>  Well, the option used to select between 64-bit and 32-bit ELF for 
> building 64-bit configurations.  I can see it has been changed from its 
> original meaning and it now only controls whether "-mno-explicit-relocs" 
> is passed to the compiler or not, which is sort of useless and certainly 
> does not match the intent nor what the description says.  The 64-bit 
> format is now used unconditionally and you can always pass such obscure 
> options to the compiler on the make's command line, so instead of this fix 
> I vote for complete removal of the BUILD_ELF64 option.

AFAIR at some point in gcc development the compiler expanded explicit
relocs to 32bit sequences unless -mno-xplicit-relocs was specified.


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