Unhandled fault: external abort

I am working with the HCD driver for i.MX21 on the 2.6.16 Linux kernel.

Before device registration using platform_device_register() the kernel gives
the following error while trying to initialize
The registers.

My program:

    /* Enable clock to the host controller */
    USBOTG_CLK_CTRL = USBOTG_CLK_CTRL_HST | USBOTG_CLK_CTRL_MAIN;

The kernel error output before panic:

[42949374.060000] Unhandled fault: external abort on non-linefetch (0x808)
at 0xe4024080
[42949374.070000] Internal error: : 808 [#1]
[42949374.070000] Modules linked in:
[42949374.070000] CPU: 0
[42949374.070000] pc : [<c0010908>]    lr : [<0000000a>]    Not tainted
[42949374.070000] sp : c0375fb4  ip : 00000002  fp : c0375fc0
[42949374.070000] r10: 00000000  r9 : 00000000  r8 : 00000000
[42949374.070000] r7 : c001d534  r6 : 00000000  r5 : c001d3b0  r4 : c0374000
[42949374.070000] r3 : e4024080  r2 : 80000000  r1 : fffff3ff  r0 : f0003fff
[42949374.070000] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment kernel
[42949374.070000] Control: 5317F  Table: C0004000  DAC: 00000017
[42949374.070000] Process swapper (pid: 1, stack limit = 0xc0374198)
[42949374.070000] Stack: (0xc0375fb4 to 0xc0376000)
[42949374.070000] 5fa0:
c0375fd0 c0375fc4 c000ea94 
[42949374.070000] 5fc0: c001085c c0375ff4 c0375fd4 c010d0e8 c000ea84
00000001 00000000 00000000 
[42949374.070000] 5fe0: 00000000 00000000 00000000 c0375ff8 c01267f4
c010d068 fabfb86a 339d278b 
[42949374.070000] Backtrace: 
[42949374.070000] Function entered at [<c001084c>] from [<c000ea94>]
[42949374.070000] Function entered at [<c000ea74>] from [<c010d0e8>]
[42949374.070000] Function entered at [<c010d058>] from [<c01267f4>]
[42949374.070000]  r7 = 00000000  r6 = 00000000  r5 = 00000000  r4 =
00000000
[42949374.070000] Code: e59f0030 eb041ff3 e59f302c e3a02102 (e5832000)


What could be the problem? 



Thanks and Regards,
Ashtekar Kaustubh





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