请教 :我在做键盘驱动时遇到Unable to handle kernel paging request at virtual ad

【原创】请教

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我在做键盘驱动时遇到Unable to handle kernel paging request at virtual address 问题

请各位大虾看看!我邮箱:[email protected]
我用nGCS4块地址(0x20800000)做回读信号地址

#define S3C2410_KEYBOARD_DATA ((0x20800000)+0)

static struct unit keyboard_unit = {
.GPA_CON = (u32 *)S3C2410_GPACON,
.GPB_CON = (u32 *)S3C2410_GPBCON,
.GPB_DAT = (u32 *)S3C2410_GPBDAT,
.GPB_UP = (u32 *)S3C2410_GPBUP,

.f = (UINT8T *) S3C2410_KEYBOARD_DATA
};

在 return *keyboard_unit.f;//0x20800000 读键盘返回
出现以下错误:

/etc/var # ./keyboard_test[2] -aa
Unable to handle kernel paging request at virtual address 20800000
pgd = c3e38000
*pgd = 00000000, *pmd = 00000000
Internal error: Oops: 0
CPU: 0
pc : [] lr : [] Not tainted
sp : c3e3ff48 ip : c3e3ff00 fp : c3e3ffa4
r10: 00000002 r9 : c3e3e000 r8 : bffffe68
r7 : c4880658 r6 : 00000000 r5 : 00000000 r4 : c4880788
r3 : c4880788 r2 : 20800000 r1 : 00000001 r0 : 0000001a
Flags: nZCv IRQs on FIQs on Mode SVC_32 Segment user
Control: C000317F Table: 33E38000 DAC: 00000015
Process keyboard_test[2 (pid: 58, stackpage=c3e3f000)
Stack: (0xc3e3ff38 to 0xc3e40000)
ff20: c0028314 c4880100
ff40: 60000013 ffffffff c4880188 c4880788 c0356f20 ffffffea c4880788 c4880254
ff60: bffffe68 c48802a8 00000000 c0356f20 ffffffea 00000000 c00485b8 c3e3ff88
ff80: c0047f8c 00000003 bffffe68 000085f4 00000003 c001b7c4 00000000 c3e3ffa8
ffa0: c001b640 c00484ec 00000003 c002193c 00000003 bffffe68 00000000 00000000
ffc0: 00000003 bffffe68 000085f4 0001066c bffffeb4 00008470 00000002 bffffea8
ffe0: 40092f20 bffffe68 000084e4 40092f24 60000010 00000003 00000000 30002001
Backtrace:
Function entered at [] from []
r8 = C001B7C4 r7 = 00000003 r6 = 000085F4 r5 = BFFFFE68
r4 = 00000003
Code: e59f0010 eb000237 e59f300c e5932024 (e5d20000)
Segmentation fault