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git bisect tells us this:

247540b03bfcbbe26b86692c9424195d76eb67f0 is the first bad commit
commit 247540b03bfcbbe26b86692c9424195d76eb67f0
Author: Mai La <mla@apm.com>
Date:   Sun Mar 18 17:59:08 2012 +0000

    powerpc/44x: Fix PCI MSI support for Maui APM821xx SoC and Bluestone
board

    This patch consists of:
    - Enable PCI MSI as default for Bluestone board
    - Change definition of number of MSI interrupts as it depends on SoC
    - Fix returning ENODEV as finding MSI node
    - Fix MSI physical high and low address
    - Keep MSI data logically

    Signed-off-by: Mai La <mla@apm.com>
    Signed-off-by: Josh Boyer <jwboyer@gmail.com>

:040000 040000 607afba6ee61212756f2bcf5acd687d6266c39a8
2868a82b0ede19c9e38ec8a571a1004e555e1098 M      arch

Which I can confirm:

this works:
git checkout 47da421981571c69ef29740cc55fa7248682e167
save this version of arch/powerpc/sysdev/ppc4xx_msi.c

this reboots:
git checkout 247540b03bfcbbe26b86692c9424195d76eb67f0

fix .config
CONFIG_PPC_DISABLE_WERROR=y
#CONDIF_PPC_WERROR is not used

cp ../ppc4xx_msi.c from 47da421981571c69ef29740cc55fa7248682e167 to
arch/powerpc/sysdev/ppc4xx_msi.c and voila this works.

Regards,

Robert

..."I don't understand why people are frightened of new ideas. It's the
old ideas that frighten me." -- John Cage

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