linux-kernel - Re: 3.4.0-rc1: No init found

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Message-ID: <4FF6759A.3010901@in.ibm.com>
Date:	Fri, 06 Jul 2012 10:50:26 +0530
From:	"Suzuki K. Poulose" <suzuki@...ibm.com>
To:	Tabi Timur-B04825 <B04825@...escale.com>
CC:	Christian Kujau <lists@...dbynature.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: 3.4.0-rc1: No init found

On 07/06/2012 04:06 AM, Tabi Timur-B04825 wrote:
> On Wed, Apr 4, 2012 at 7:36 AM, Suzuki K. Poulose <suzuki@...ibm.com> wrote:
>
>>> Not sure if this is related, but at the end of each kernel compilation,
>>> the following messages are printed:
>>>
>>> ------------
>>>     SYSMAP  System.map
>>>     SYSMAP  .tmp_System.map
>>>     WRAP    arch/powerpc/boot/zImage.pmac
>>> INFO: Uncompressed kernel (size 0x6e52f8) overlaps the address of the
>>> wrapper(0x400000)
>>> INFO: Fixing the link_address of wrapper to (0x700000)
>>>     WRAP    arch/powerpc/boot/zImage.coff
>>> INFO: Uncompressed kernel (size 0x6e52f8) overlaps the address of the
>>> wrapper(0x500000)
>>> INFO: Fixing the link_address of wrapper to (0x700000)
>>>     WRAP    arch/powerpc/boot/zImage.miboot
>>> INFO: Uncompressed kernel (size 0x6d4b80) overlaps the address of the
>>> wrapper(0x400000)
>>> INFO: Fixing the link_address of wrapper to (0x700000)
>>>     Building modules, stage 2.
>>>     MODPOST 24 modules
>>> ------------
>>>
>>> I started to see these messages in January (around Linux 3.2.0), but never
>>> investigated what it was since the produced kernels continued to boot just
>>> fine.
>>
>>
>> The above change was added by me. The message is printed when the 'wrapper'
>> script finds that decompressed kernel overlaps the 'bootstrap code' which
>> does the decompression. So it shifts the 'address' of the bootstrap code to
>> the next higher MB. As such it is harmless.
>
> I see this message every time when I build the kernel.  I know it's
> harmless, but is this something that can be "fixed"?  That is, can we
> change some linker script (or whatever) to make 0x700000 the default
> value?

You could do this by setting the link_address by checking your platform,
like some of the other platforms (e.g, pseries, ps3 ).

Or

we could add a parameter to the wrapper script to set the link_address ?

Ben, Josh,
What do you think ?

  Or maybe modify the wrapper script to just automatically find
> the right spot without printing a message?

We need the message there for people who have restriction of a fixed 
link address. This would help them to handle the situation accordingly
than blindly failing on boot.

Thanks
Suzuki

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