Crash while accessing Intel 28F128 flash

[Achin Gupta]

Hi, 
I am consistently getting a crash in the "mtd_close" routine whenever I
try performing any read/write operation on an Intel NOR flash chip on my
harwdare. I have been trying to run utilities like "flash_info",
"mtd_debug", "flash_erase" & all of them crash with the following stack
backtrace :-

>>>>>>>>>
Unable to handle kernel NULL pointer dereference at virtual address
00000000
pgd = c09e8000
[00000000] *pgd=00029031, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#3]
Modules linked in:
CPU: 0
PC is at __wake_up_common+0x28/0x7c
LR is at 0x0
pc : [<c003c3f4>]    lr : [<00000000>]    Not tainted
sp : c03dbef4  ip : c03dbf20  fp : c03dbf1c
r10: 00000003  r9 : 00000000  r8 : 00000000
r7 : c01be288  r6 : c0953794  r5 : 00000000  r4 : 00000001
r3 : 00000000  r2 : 00000001  r1 : 00000003  r0 : c0953794
Flags: nzcv  IRQs off  FIQs on  Mode SVC_32  Segment user
Control: 5397F  Table: 009E8000  DAC: 00000015
Process mtd_debug (pid: 182, stack limit = 0xc03da194)
Stack: (0xc03dbef4 to 0xc03dc000)
bee0:                                              60000013 00000000
c0953740
bf00: c01be288 c002b984 c03da000 00000000 c03dbf34 c03dbf20 c003c474
c003c3d8
bf20: 00000000 c0953740 c03dbf54 c03dbf38 c0111574 c003c454 c0955c00
c1b930ac
bf40: c09c52a0 c1b192ac c03dbf68 c03dbf58 c0109b30 c01114d8 c09e4d00
c03dbf88
bf60: c03dbf6c c0077d7c c0109b08 c09e4d00 00000000 c09d11e0 00000006
c03dbfa4
bf80: c03dbf8c c007661c c0077d30 00000000 00000003 beffff67 00000000
c03dbfa8
bfa0: c002b800 c00765a4 00000000 c0031d30 00000003 40074117 00000002
00000001
bfc0: 00000000 00000003 beffff67 befffea4 00000001 00000003 00000000
00009258
bfe0: 4005cdd4 befffdf8 000093ac 4005cddc 20000010 00000003 00000000
00000000
Backtrace:
[<c003c3cc>] (__wake_up_common+0x0/0x7c) from [<c003c474>]
(__wake_up+0x2c/0x34)
[<c003c448>] (__wake_up+0x0/0x34) from [<c0111574>]
(cfi_intelext_sync+0xa8/0xb8)
 r4 = C0953740
[<c01114cc>] (cfi_intelext_sync+0x0/0xb8) from [<c0109b30>]
(mtd_close+0x34/0x48)
 r7 = C1B192AC  r6 = C09C52A0  r5 = C1B930AC  r4 = C0955C00
[<c0109afc>] (mtd_close+0x0/0x48) from [<c0077d7c>] (__fput+0x58/0xf8)
 r4 = C09E4D00
[<c0077d24>] (__fput+0x0/0xf8) from [<c007661c>] (filp_close+0x84/0x90)
 r7 = 00000006  r6 = C09D11E0  r5 = 00000000  r4 = C09E4D00
[<c0076598>] (filp_close+0x0/0x90) from [<c002b800>]
(ret_fast_syscall+0x0/0x2c)
 r6 = BEFFFF67  r5 = 00000003  r4 = 00000000
>>>>>>>>>>

Can someone please help me with this?

Regards,
Achin

____________________________________
Achin Gupta
Software Engineer
Conexant India
Tel.: +91 120 2512833-36 
Fax.: +91 120 2516047
Email: achin.gupta at conexant.com
Web: www.conexant.com
____________________________________




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