sequoia: The final kernel image would overwrite the device tree

[Geert Uytterhoeven]

	Hi Ben,

Current kernel (2.6.31-rc4) fails to boot on sequoia:

| ## Booting image at 00100000 ...
|    Image Name:   Linux-2.6.31-rc4-00003-g52c6890-
|    Image Type:   PowerPC Linux Kernel Image (gzip compressed)
|    Data Size:    1680490 Bytes =  1.6 MB
|    Load Address: 00400000
|    Entry Point:  00400458
|    Verifying Checksum ... OK
|    Uncompressing Kernel Image ... OK
| CPU clock-frequency <- 0x27bc86a4 (667MHz)
| CPU timebase-frequency <- 0x27bc86a4 (667MHz)
| /plb: clock-frequency <- 9ef21a9 (167MHz)
| /plb/opb: clock-frequency <- 4f790d4 (83MHz)
| /plb/opb/ebc: clock-frequency <- 34fb5e3 (56MHz)
| /plb/opb/serial at ef600300: clock-frequency <- a8c000 (11MHz)
| /plb/opb/serial at ef600400: clock-frequency <- a8c000 (11MHz)
| /plb/opb/serial at ef600500: clock-frequency <- 42ecac (4MHz)
| /plb/opb/serial at ef600600: clock-frequency <- 42ecac (4MHz)
| Memory <- <0x0 0x0 0xffff000> (255MB)
| ethernet0: local-mac-address <- 00:10:ec:00:f1:df
| ethernet1: local-mac-address <- 00:10:ec:80:f1:df
| 
| zImage starting: loaded at 0x00400000 (sp: 0x0ff2ba18)
| Allocating 0x85e77c bytes for kernel ...
| The final kernel image would overwrite the device tree?

Git bisect told me the bad guy is:

| commit 5d38902c483881645ba16058cffaa478b81e5cfa
| Author: Benjamin Herrenschmidt <benh at kernel.crashing.org>
| Date:   Wed Jun 17 17:43:59 2009 +0000
| 
|     powerpc: Add irqtrace support for 32-bit powerpc

However, disabling CONFIG_PROVE_LOCKING also fixes the problem.

With kind regards,

Geert Uytterhoeven
Software Architect
Techsoft Centre

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