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Subjectv3.4 boot failure on qemu-system-arm -M versatilepb

I found linux-3.4 kernel fails to mount the rootfs on "qemu-system-arm -M versatile."

Git bisect shows commit c334bc1 cause this first.

So I tried to revert it by putting arch/arm/mach-versatile/include/mach/io.h and adding select NEED_MACH_IO_H in the section of ARCH_VERSATILE in arch/arm/Kconfig, then the kernel can mount the rootfs.

Can someone confirm and fix this?

Takuo Koguchi

Uncompressing Linux... done, booting the kernel.
Booting Linux on physical CPU 0
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 3.4.0-yocto-standard (koguchi@mg70k) (gcc version 4.5.2 (Sourcery G++ Lite 2011.03-41) ) #37 PREEMPT Sun May 27 22:36:22 JST 2012
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00093177
CPU: VIVT data cache, VIVT instruction cache
Machine: ARM-Versatile PB
eth0: link up
IP-Config: Complete:
device=eth0, addr=, mask=, gw=
host=, domain=, nis-domain=(none)
bootserver=, rootserver=, rootpath=
input: AT Raw Set 2 keyboard as /devices/fpga:06/serio0/input/input0
md: Skipping autodetection of RAID arrays. (raid=autodetect will force)
VFS: Cannot open root device "0x0800" or unknown-block(8,0): error -6
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,0)
[<c0013870>] (unwind_backtrace+0x0/0xec) from [<c0389b68>] (dump_stack+0x20/0x24)
[<c0389b68>] (dump_stack+0x20/0x24) from [<c0389bf4>] (panic+0x88/0x1c4)
[<c0389bf4>] (panic+0x88/0x1c4) from [<c04fbde8>] (mount_block_root+0x240/0x290)
[<c04fbde8>] (mount_block_root+0x240/0x290) from [<c04fbf80>] (mount_root+0x50/0x68)
[<c04fbf80>] (mount_root+0x50/0x68) from [<c04fc108>] (prepare_namespace+0x170/0x1d0)
[<c04fc108>] (prepare_namespace+0x170/0x1d0) from [<c04fba08>] (kernel_init+0x1bc/0x204)
[<c04fba08>] (kernel_init+0x1bc/0x204) from [<c000e7dc>] (kernel_thread_exit+0x0/0x8)

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