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From: (Eric W. Biederman)
To: Etienne Lorrain <>
Cc: "H. Peter Anvin" <>,,
Subject: Re: Re : [PATCH] Compressed ia32 ELF file generation for loading by Gujin 1/3
Date: Tue, 06 Feb 2007 11:12:39 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <> (Etienne Lorrain's message of "Tue, 6 Feb 2007 17:23:55 +0000 (GMT)")

Etienne Lorrain <> writes:

> H. Peter Anvin wrote:
>> Actually, as far as I can see, he has re-invented having a real-mode 
>> code chunk which then gets run before the protected-mode kernel.  We 
>> already have that!
>   I did not claim to have invented anything there, this is just a quite
>  simple C code to execute instead of the current real mode assembly:
>  it is a rewrite with obvious advantages/disadvantages.
>  New features are more that this real-mode function can return an error
>  to the bootloader to tell something to the user, so the user can select
>  another kernel with the right processor, another video mode... with
>  clean error messages - not a crash dump because this assembly
>  instruction is not for that processor.

Having an error handling compatibility that is backwards compatible sounds

>   I am still saying that the bootloader knows the root filesystem to
>  be used by the kernel it loads, and that ELF is a clean format to
>  store different sections to be loaded into memory at predefined
>  addresses.

Yes.  Although when you think sections instead of segments I'm a little

>  Also there isn't any more kernel size limit.

I think as HPA points out we have gotten past that a long time
ago with the bzImage format.

With the right delicacy, and preserving backwards compatibility
with existing bootloaders I think we can achieve things.

The big issue is that sometimes bootloaders are a little bit brittle.


  parent reply	other threads:[~2007-02-06 18:13 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06 17:23 Etienne Lorrain
2007-02-06 17:34 ` H. Peter Anvin
2007-02-06 18:12 ` Eric W. Biederman [this message]
  -- strict thread matches above, loose matches on Subject: below --
2007-02-11 20:49 RE : " Eric W. Biederman
2007-02-12 10:42 ` Etienne Lorrain
2007-02-12 12:29   ` Eric W. Biederman
2007-02-12 13:58     ` Etienne Lorrain
2007-02-12 14:06     ` H. Peter Anvin
2007-02-12 19:47       ` Eric W. Biederman
2007-02-08 13:10 Etienne Lorrain
2007-02-09  5:59 ` Vivek Goyal
2007-02-09 13:04   ` Etienne Lorrain
2007-02-09 19:42     ` Eric W. Biederman
2007-02-08  9:48 Etienne Lorrain
2007-02-08 11:20 ` Eric W. Biederman
2007-02-08 11:37 ` Vivek Goyal
2007-02-08 12:10   ` Eric W. Biederman
2007-02-07 14:29 Etienne Lorrain
2007-02-07 17:12 ` H. Peter Anvin
2007-02-06 13:23 Etienne Lorrain
2007-02-06 13:12 Etienne Lorrain
2007-02-07  6:44 ` Vivek Goyal
2007-02-06 12:49 Etienne Lorrain

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