[SOLVED] Beagleboard xm rev C doesn't shutdown, reboot properly.

Hello, I have a Beagleboard xm Rev C. running linux 3.4.6 with busybox for the user space. everything was generated with buildroot.

whenever I use the fallowing commands: halt, poweroff, reboot, restart.

I get the fallowing output:
------------------------------------

Unable to handle kernel NULL pointer dereference at virtual address 00000000          
[  227.809326] pgd = deff8000                                                                        
[  227.812255] [00000000] *pgd=9efd1831, *pte=00000000, *ppte=00000000                               
[  227.818908] Internal error: Oops: 80000007 [#1] SMP ARM                                           
[  227.824371] Modules linked in:                                                                    
[  227.827575] CPU: 0    Not tainted  (3.4.6 #1)                                                     
[  227.832153] PC is at 0x0                                                                          
[  227.834838] LR is at smp_send_stop+0x4c/0xe8                                                      
[  227.839324] pc : [<00000000>]    lr : [<c0018d70>]    psr: 60000013                               
[  227.839324] sp : de40de70  ip : 00000000  fp : 00000000                                           
[  227.851379] r10: 00000000  r9 : de40c000  r8 : c0013848                                           
[  227.856903] r7 : 00000000  r6 : c0649290  r5 : 000f4240  r4 : de40de74                            
[  227.863739] r3 : 00000000  r2 : 00000000  r1 : 00000006  r0 : de40de74                            
[  227.870605] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user                     
[  227.878112] Control: 10c5387d  Table: 9eff8019  DAC: 00000015                                     
[  227.884124] Process init (pid: 579, stack limit = 0xde40c2f8)                                     
[  227.890167] Stack: (0xde40de70 to 0xde40e000)                                                     
[  227.894744] de60:                                     00000000 00000000 4321fedc 4321fedc         
[  227.903350] de80: de40c000 c0014b4c 00000000 c0050c7c 00000000 00000000 00000000 00000000         
[  227.911956] dea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000         
[  227.920562] dec0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000         
[  227.929138] dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000         
[  227.937744] df00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000         
[  227.946350] df20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000         
[  227.954956] df40: 00000000 de40c000 c0067f00 ded7c0c0 00000001 00000000 00000000 de40c000         
[  227.963531] df60: c00137a0 ded7c0c0 00000001 60000010 00000000 ef000000 00000000 c0089250         
[  227.972137] df80: 00000000 00000000 00000000 00000058 00000000 00000000 00000000 00000058         
[  227.980743] dfa0: c0013848 c0013680 00000000 00000000 fee1dead 28121969 4321fedc 00000000         
[  227.989318] dfc0: 00000000 00000000 00000000 00000058 000a1d04 00000000 b6f34f74 00000000         
[  227.997924] dfe0: 000a19a4 bee1e950 0006bc98 b6ee594c 60000010 fee1dead 00000000 00000000         
[  228.006530] [<c0018d70>] (smp_send_stop+0x4c/0xe8) from [<c0014b4c>] (machine_halt+0x8/0xc)       
[  228.015319] [<c0014b4c>] (machine_halt+0x8/0xc) from [<c0050c7c>] (sys_reboot+0x160/0x208)        
[  228.024017] [<c0050c7c>] (sys_reboot+0x160/0x208) from [<c0013680>] (ret_fast_syscall+0x0/0x3c)   
[  228.033172] Code: bad PC value                                                                    
[  228.036468] ---[ end trace 5ad4205007b21a70 ]---

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I tried googling around, but didn't come up with anything use full.

ok, I figured it out.

I googled the below instead:

"Internal error: Oops: 80000007 [#1] SMP ARM"

I found this thread with the solution:

http://lists.arm.linux.org.uk/lurker...ac9a32.en.html

modified the file in the buildroot/output/build/linux-3.4.6/arch/arm/kernel/smp.c at line 595 to look like this

if (!cpumask_empty(&mask))
smp_cross_call(&mask, IPI_CPU_STOP);

I then had buildroot re-build the kernel image.

Now when I type reboot or halt it actually does what it's suppose to.