From: Tony Breeds <tony@bakeyournoodle•com>
To: Olaf Hering <olaf@aepfle•de>
Cc: linuxppc-dev@ozlabs•org, Paul Mackerras <paulus@samba•org>
Subject: Re: [PATCH v2] Change the default link address for pSeries zImage kernels.
Date: Fri, 4 Jul 2008 13:14:49 +1000 [thread overview]
Message-ID: <20080704031449.GW20457@bakeyournoodle.com> (raw)
In-Reply-To: <20080702150432.GA5910@aepfle.de>
On Wed, Jul 02, 2008 at 05:04:32PM +0200, Olaf Hering wrote:
> Setting real-base to what?
32Mb, or any other value big enough to allow the tftp to fit in
${real-base} - ${load-base}. I admitt it's far from ideal.
> What currently happens with a large boot file is:
> Firmware loads the zImage at load-base, finds that the ELF file is too
> large to fit into the memory window and stops.
>
> With your patch, firmware loads 12566528 bytes, and starts the zImage.
> The result is a truncated file, the initrd will be corrupted, kernel
> panic in populate_rootfs().
Okay that's not the behaviour I see here on the POWER4 machines, they
grab the firt n bytes (probabbly 12566528), and then abort with a
message about image being too large and it cannot be split.
(something akin to https://bugzilla.novell.com/show_bug.cgi?id=350212 )
> The only system where firmware relocates itself from 12MB to 32MB is a
> p640 with firmware version NAN04194.
> All other systems seem to ignore the NOTE section, real-base remains at
> 0xc00000
Add I thought /all/ POWER4 systems were unable to relocate OF
(regardless of whether the request is from the NOTE or from set-env
real-base).
> So I do not think your patch is a real improvement,
> clear error vs. silent corruption.
>
> Do you happen to know how to automate the changing the value of
> real-base? The addnote change has appearently no effect on recent
> systems.
It's there for POWER5 and on. I was sure that no POWER4 machines could
be reloacted, but you say that your p640 can.
Yours Tony
linux.conf.au http://www.marchsouth.org/
Jan 19 - 24 2009 The Australian Linux Technical Conference!
prev parent reply other threads:[~2008-07-04 3:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-23 8:13 [PATCH 1/1] Change the default link address for pSeries zImage kernels Tony Breeds
2008-06-23 8:16 ` Tony Breeds
2008-06-23 9:30 ` Adrian Reber
2008-06-23 9:57 ` Benjamin Herrenschmidt
2008-06-23 12:20 ` Michael Ellerman
2008-06-24 4:20 ` [PATCH v2] " Tony Breeds
2008-07-02 15:04 ` Olaf Hering
2008-07-04 3:14 ` Tony Breeds [this message]
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