linux-kernel - Re: [CFT] ELF Relocatable x86 and x86

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Date:	Mon, 31 Jul 2006 16:25:20 -0400
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	fastboot@...l.org, Jan Kratochvil <lace@...kratochvil.net>,
	Magnus Damm <magnus.damm@...il.com>,
	Horms <horms@...ge.net.au>, Linda Wang <lwang@...hat.com>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [CFT] ELF Relocatable x86 and x86_64 bzImages

On Mon, Jul 31, 2006 at 10:19:04AM -0600, Eric W. Biederman wrote:
> 
> I have spent some time and have gotten my relocatable kernel patches
> working against the latest kernels.  I intend to push this upstream
> shortly.
> 
> Could all of the people who care take a look and test this out
> to make certain that it doesn't just work on my test box?
> 
Hi Eric,

Currently I am testing your patches on i386. With CONFIG_RELOCATABLE=y
kernel boots fine and kexec also works.

But my kernel hangs on kexec on panic case. It hangs early in 
decompress_kernel(). Kernel hangs at following condition.

+       if (((u32)output - CONFIG_PHYSICAL_START) & 0x3fffff)
+               error("Destination address not 4M aligned");

I have reserved 64MB at 16M and kernel is loaded at 16M. 

I had expected that I would get "Destination address not 4M aligned" on
serial console but did not happen. Had to put outb() to get to this point.

Will look more into it.

Thanks
Vivek 
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