Jiffies: INTC and GPT timer crash

Ok, So after configuring INTC and GPT1, its now possible to proceed a bit further, where in I wait looping inside calibration_loop function waiting for jiffies to be updated.

Sure enough, I do receive the GPT1 interrupt when the timer overflows, however, I see a big crash happening as the interrupt is not getting correctly mapped.

Also, it must be noted that GPT1 is still not configured correctly for 1 ms delay, but rather need to wait for more than 10 min to get this crash.

Below is a log that I get when system crashes:


OMAP3 beagleboard.org # bootm 0x80300000
## Booting kernel from Legacy Image at 80300000 ...
   Image Name:   Puppy Linux
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1399776 Bytes =  1.3 MB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK


Starting kernel ...


Uncompressing Linux... done, booting the kernel.
<5>Linux version 2.6.35-rc3 (amar@amar-laptop) (gcc version 4.4.1 (Sourcery G++                                                                                                              Lite 2010q1-188) ) #12 PREEMPT Thu Aug 26 23:04:06 CEST 2010
CPU: ARMv7 Processor [411fc083] revision 3 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: PuppyBeagle
Memory policy: ECC disabled, Data cache writeback
<7>On node 0 totalpages: 65536
<7>free_area_init_node: node 0, pgdat c02d4714, node_mem_map c02eb000
<7>  Normal zone: 512 pages used for memmap
<7>  Normal zone: 0 pages reserved
<7>  Normal zone: 65024 pages, LIFO batch:15
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024
<5>Kernel command line: console=ttyS2,115200n8 console=tty0 root=/dev/mmcblk0p2                                                                                                              rw rootfstype=ext3 rootwait omapfb.video_mode=1024x768MR-16@60
<6>PID hash table entries: 1024 (order: 0, 4096 bytes)
<6>Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
<6>Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
<6>Memory: 128MB 128MB = 256MB total
<5>Memory: 256916k/256916k available, 5228k reserved, 0K highmem
<5>Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    DMA     : 0xffc00000 - 0xffe00000   (   2 MB)
    vmalloc : 0xd0800000 - 0xe0000000   ( 248 MB)
    lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
    modules : 0xbf000000 - 0xc0000000   (  16 MB)
      .init : 0xc0008000 - 0xc0021000   ( 100 kB)
      .text : 0xc0021000 - 0xc02a9000   (2592 kB)
      .data : 0xc02c0000 - 0xc02d4d20   (  84 kB)
<6>Hierarchical RCU implementation.
<6>     RCU-based detection of stalled CPUs is disabled.
<6>     Verbose stalled-CPUs detection is disabled.
<6>NR_IRQS:96

Console: colour dummy device 80x30
<6>console [tty0] enabled
<6>Calibrating delay loop... <4>Bad IRQ3224117184
<1>Unhandled fault: alignment exception (0x801) at 0xfc200087
<0>Internal error: : 801 [#1] PREEMPT
<0>last sysfs file:
Modules linked in:
CPU: 0    Not tainted  (2.6.35-rc3 #12)
PC is at puppy_irq_mask+0x2c/0x34
LR is at handle_level_irq+0x3c/0x170
pc : []    lr : []    psr: 600001d3
sp : c02c1f58  ip : cfc07220  fp : 00000000
r10: 0000001f  r9 : c02c0000  r8 : 00000002
r7 : 00000003  r6 : 00000003  r5 : 00000000  r4 : c02c64d4
r3 : fc200087  r2 : 00000001  r1 : c02c64d4  r0 : 00000008
Flags: nZCv  IRQs off  FIQs off  Mode SVC_32  ISA ARM  Segment kernel
Control: 10c5387f  Table: 80004019  DAC: 00000017
<0>Process swapper (pid: 0, stack limit = 0xc02c0268)
<0>Stack: (0xc02c1f58 to 0xc02c2000)
<0>1f40:                                                       00000003 00000000
<0>1f60: c001bce8 c0021078 60000153 ffffffff c02c1fac c0021ae4 00002000 c02c1f30
<0>1f80: ffff8ad0 ffff8ad0 c02c5718 c02c3938 c001bce8 c02c3ad0 8001aaa4 411fc083
<0>1fa0: 0000001f 00000000 cfc07254 c02c1fc0 c0019c08 c0019c14 60000153 ffffffff
<0>1fc0: c02d4da0 c001b44c c001bce8 c02c3ad0 8001aaa4 c0008b04 c0008660 00000000
<0>1fe0: 00000000 c001bce8 10c53c7d c02d50b0 c001bce4 80008034 00000000 00000000
[] (puppy_irq_mask+0x2c/0x34) from [] (handle_level_irq+0x3c                                                                                                             /0x170)
[] (handle_level_irq+0x3c/0x170) from [] (asm_do_IRQ+0x78/0x                                                                                                             8c)
[] (asm_do_IRQ+0x78/0x8c) from [] (__irq_svc+0x44/0x78)
Exception stack(0xc02c1f78 to 0xc02c1fc0)
1f60:                                                       00002000 c02c1f30
1f80: ffff8ad0 ffff8ad0 c02c5718 c02c3938 c001bce8 c02c3ad0 8001aaa4 411fc083
1fa0: 0000001f 00000000 cfc07254 c02c1fc0 c0019c08 c0019c14 60000153 ffffffff
[] (__irq_svc+0x44/0x78) from [] (calibrate_delay+0xbc/0x1e4                                                                                                             )
[] (calibrate_delay+0xbc/0x1e4) from [] (start_kernel+0x228/                                                                                                             0x27c)
[] (start_kernel+0x228/0x27c) from [<80008034>] (0x80008034)
<0>Code: e203340f e0823003 e3a02001 e1a00012 (e5830000)
<4>Bad IRQ3224116728
<4>Bad IRQ65542
<4>Bad IRQ65542
<4>Bad IRQ65542
<4>Bad IRQ65542
<4>Bad IRQ65542
<4>Bad IRQ65542
<4>Bad IRQ65542
<4>Bad IRQ65542




Next steps, configure GPT for 1 ms.
Mapping GPT interrupt with proper interrupt handler. A lot of interrupt handling study to be done here!