linux-kernel - Re: [PATCH 12/12] i386 boot: Add an ELF header to bzImage

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Message-ID: <45241F2A.4080908@zytor.com>
Date:	Wed, 04 Oct 2006 13:52:58 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	vgoyal@...ibm.com
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...l.org>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Reloc Kernel List <fastboot@...ts.osdl.org>, ak@...e.de,
	horms@...ge.net.au, lace@...kratochvil.net, magnus.damm@...il.com,
	lwang@...hat.com, dzickus@...hat.com, maneesh@...ibm.com
Subject: Re: [PATCH 12/12] i386 boot: Add an ELF header to bzImage

Vivek Goyal wrote:
> 
> memsz will contain the memory required to load the kernel image. And
> probably should also include the memory used by kernel in initial boot
> up code which is unaccounted and unbounded.
> 

Right, so that's a major project to produce.

One modification that would be highly desirable is to be able to put 
initrd/initramfs in highmem, since people keep adding options which 
break the highmem/lowmem boundary without consideration for the 
implications; the latest one being vmalloc=.

>> I suspect we need at least one more piece of data, which is the required 
>> alignment of a relocated kernel.
> 
> Now with the introduction of config option CONFIG_PHYSICAL_ALIGN, it
> should be easy to get.

Yes, that should be easy.

>>  Either which way, it seems clear that 
>> there is some re-engineering that needs to be done, and I think we need 
>> to better understand *why* the proposed patch failed.
>>
>> Can this failure be reproduced in a simulator?
> 
> I will try to reproduce in a simulator. May be qemu? Any suggestions?

I find Bochs easier to debug under, although it's substantially slower.

	-hpa
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