Hi,
We're doing some development with the TI8168 EVM and have followed the instructions on the TI wiki for enabling the /dev framebuffer. When we do this we end up with a kernel halt during boot (see below for example).
Doing some investigation it looks like the for loop in mach-omap2/mailbox.c: omap_mbox_get() might be wrong:
for(mbox = *mboxes; mbox; mbox++)
It looks like this increments the omap_mbox structure rather than the array? Should the loop actually be something like
for(mbox = *mboxes; (mbox != NULL); mbox = *mboxes++)
I'm hesitant to query this as it looks like this change has been in the kernel for about a year, so perhaps I'm missing something?
Stuart
Kernel Halt
IR RC5 (streamzap) protocol handler initialized
IR LIRC bridge handler initialized
Linux video capture interface: v2.00
OMAP Watchdog Timer Rev 0x00: initial timeout 60 sec
Unable to handle kernel NULL pointer dereference at virtual address 00000002
pgd = c0004000
[00000002] *pgd=00000000
Internal error: Oops: 5 [#1]
last sysfs file:
Modules linked in:
CPU: 0 Not tainted (2.6.37 #2)
PC is at strcmp+0xc/0x3c
LR is at omap_mbox_get+0x50/0x1f8
pc : [<c0145d70>] lr : [<c004d704>] psr: 80000013
sp : c2c25f10 ip : c2c25f20 fp : c2c25f1c
r10: 00000000 r9 : 00000000 r8 : 00000000
r7 : c0322314 r6 : c03a7938 r5 : c03ac6c4 r4 : c0385b8c/mbo/
r3 : 00000064 r2 : 00000076 r1 : c0322314 r0 : 00000002
Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: 10c5387d Table: 80004019 DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc2c242e8)
Stack: (0xc2c25f10 to 0xc2c26000)
Stack: (0xc2c25f10 to 0xc2c26000)
5f00: c2c25f44 c2c25f20 c004d704 c0145d70
5f20: c021d3cc c0145d70 c03a78dc c03a7810 c03a78d8 c001e1ac c2c25f6c c2c25f48
5f40: c022133c c004d6c0 00000000 00000000 c03ac0c0 c2c24000 c03ac0c0 c0056c28
5f60: c2c25f94 c2c25f70 c001e1e8 c0221148 00000000 c2c24000 c03ac0c0 c0056c28
5f80: c001e1ac 00000000 c2c25fdc c2c25f98 c002b44c c001e1b8 c2c25fbc 30342980
5fa0: 00000036 00000000 c2c25fc4 00000197 c0391998 c0021e34 c0021e84 c0056c28
5fc0: 00000013 00000000 00000000 00000000 c2c25ff4 c2c25fe0 c0008998 c002b324
5fe0: 00000000 c00088f8 00000000 c2c25ff8 c0056c28 c0008904 33c53c6c 33d53cec
Backtrace:
[<c0145d64>] (strcmp+0x0/0x3c) from [<c004d704>] (omap_mbox_get+0x50/0x1f8)
[<c004d6b4>] (omap_mbox_get+0x0/0x1f8) from [<c022133c>] (notify_shm_drv_setup+0x200/0x28c)
r7:c001e1ac r6:c03a78d8 r5:c03a7810 r4:c03a78dc
[<c022113c>] (notify_shm_drv_setup+0x0/0x28c) from [<c001e1e8>] (notify_init+0x3c/0x2c8)
r6:c0056c28 r5:c03ac0c0 r4:c2c24000
[<c001e1ac>] (notify_init+0x0/0x2c8) from [<c002b44c>] (do_one_initcall+0x134/0x19c)
r8:00000000 r7:c001e1ac r6:c0056c28 r5:c03ac0c0 r4:c2c24000
r3:00000000
[<c002b318>] (do_one_initcall+0x0/0x19c) from [<c0008998>] (kernel_init+0xa0/0x14c)
[<c00088f8>] (kernel_init+0x0/0x14c) from [<c0056c28>] (do_exit+0x0/0x644)
r5:c00088f8 r4:00000000
Code: e89da800 e1a0c00d e92dd800 e24cb004 (e4d03001)
end
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