Re: [CFT] ELF Relocatable x86 and x86_64 bzImages

From: Vivek Goyal <vgoyal@in.ibm.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: fastboot@osdl.org, Jan Kratochvil <lace@jankratochvil.net>,
	Magnus Damm <magnus.damm@gmail.com>, Horms <horms@verge.net.au>,
	Linda Wang <lwang@redhat.com>,
	linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [CFT] ELF Relocatable x86 and x86_64 bzImages
Date: Mon, 31 Jul 2006 16:25:20 -0400	[thread overview]
Message-ID: <20060731202520.GB11790@in.ibm.com> (raw)
In-Reply-To: <m1u04x4uiv.fsf_-_@ebiederm.dsl.xmission.com>

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 