PB1176 broken in -rc1

[Will Deacon]

Hi Linus,

My PB1176 platform appears to lock up as soon as it hits userspace when
running a 3.1-rc1 kernel. If I revert the commit:

f022e4e4 ("ARM: 6986/1: mach-realview: add TCM support for PB1176")

Then things start working again.

My dmesg contains:

[    0.000000] CPU: found DTCM0 4k @ 00000000, not enabled
[    0.000000] CPU: moved DTCM0 4k to fffe8000, enabled
[    0.000000] CPU: found DTCM1 4k @ 00000000, not enabled
[    0.000000] CPU: moved DTCM1 4k to fffe9000, enabled
[    0.000000] CPU: found ITCM0 4k @ 00000000, not enabled
[    0.000000] CPU: moved ITCM0 4k to fffe0000, enabled
[    0.000000] CPU: found ITCM1 4k @ 00000000, not enabled
[    0.000000] CPU: moved ITCM1 4k to fffe1000, enabled
[    0.000000] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 32512
[    0.000000] Kernel command line: root=/dev/nfs ip=dhcp console=ttyAMA0 nfsroot=10.1.69.60:/export/debian,tcp rw
[    0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Memory: 128MB = 128MB total
[    0.000000] Memory: 123692k/123692k available, 7380k reserved, 0K highmem
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     DTCM    : 0xfffe8000 - 0xfffea000   (   8 kB)
[    0.000000]     ITCM    : 0xfffe0000 - 0xfffe2000   (   8 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     DMA     : 0xffc00000 - 0xffe00000   (   2 MB)
[    0.000000]     vmalloc : 0xc8800000 - 0xf8000000   ( 760 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xc8000000   ( 128 MB)
[    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
[    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
[    0.000000]       .text : 0xc0008000 - 0xc05670d4   (5501 kB)
[    0.000000]       .init : 0xc0568000 - 0xc059e000   ( 216 kB)
[    0.000000]       .data : 0xc059e000 - 0xc05c8ac8   ( 171 kB)
[    0.000000]        .bss : 0xc05c9024 - 0xc0610578   ( 286 kB)

But then later hangs at:

[    6.581778] VFS: Mounted root (nfs filesystem) on device 0:12.


Any thoughts on how to debug this? The NULL addresses in the dmesg look
strange to me, but I'm not familiar with the TCMs.

Cheers,

Will