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6410의 CS5를 사용하여 특정 driver에서 사용하려 합니다.

커널 버젼은 2.6.21.5-cfs-v19 입니다.

먼저 커널에서 phy address 를 virtual address로 매핑하였습니다

0x38000000 -> 0xF4000000

1.  ./arch/arm/mach-s3c6410/mach-smdk6410.c

static struct map_desc smdk6410_iodesc[] __initdata = {
    IODESC_ENT(DM9000),
    IODESC_ENT(TL16C554)                                    // <<-----------추가한 부분
};

2.  ./include/asm-arm/arch/map.h

#define S3C2410_ADDR(x)   (0xF0000000 + (x))

//아래 사항 추가

#define S3C24XX_VA_TL16C554       S3C2410_ADDR(0x04000000)
#define S3C24XX_PA_TL16C554       (0x38000000)
#define S3C24XX_SZ_TL16C554       SZ_1M

device driver 부분 입니다.

{

.. 생략

writel(readl(S3C_SROM_BW) & ~(0xf << 20) , S3C_SROM_BW);
writel(readl(S3C_SROM_BW) |  (1 << 22) | (1 << 23) , S3C_SROM_BW);

// S3C_SROM_BC5은 default로 사용

uartbase = S3C24XX_VA_ANDCS5;

printk(" TL16C554_Init : uartbase value : 0x%x \n",*uartbase);                             <<----------- uartbase access시 kernel panic

... 생략

}

--------------------------------------------------------------------------------------------------

해당 driver를 insmod시 다음과 같은 kernel panic이 발생합니다...

제가 잘못한 부분이나 빼먹은 부분이 있나요?

uartbase [0xf4000000]
 TL16C554_Init : uartbase : 0xf4000000
Unhandled fault: external abort on linefetch (0x1806) at 0x00000000
Internal error: : 1806 [#1]

CPU: 0
PC is at printk+0x4/0x24
LR is at init_module+0xcc/0x120 [adtlc554]
pc : [<c009973c>]    lr : [<bf0130cc>]    Tainted: P
sp : c4aefed8  ip : c4aefed8  fp : c4aefeec
r10: 00000025  r9 : c607e000  r8 : c51c67c4
r7 : 00000025  r6 : bf0083a0  r5 : 00000000  r4 : bf008520
r3 : f4000000  r2 : 00000000  r1 : 00002473  r0 : bf0072ce
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: C5387F
Table: 5442C008  DAC: 00000015
Process insmod (pid: 857, stack limit = 0xc4aee250)
Stack: (0xc4aefed8 to 0xc4af0000)
fec0:                                                       c51c679c c51c6600
fee0: c4aeffa4 c4aefef0 c00b7724 bf01300c 00000000 c4424824 00000000 00000000
ff00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
ff20: 00000009 00000000 00000000 00000000 00000000 c609ca30 c50b6b00 c6092c0b
ff40: c60932d0 c6092f38 00000004 000000a4 000000a4 bf0083e8 c01745a4 00000023
ff60: c60932f8 bf0083ac c02dc5f0 c6093320 00000000 00000000 c00816ec 0001ee6b
ff80: bebf3ea0 00000310 00000080 c007adc8 c4aee000 00000000 00000000 c4aeffa8
ffa0: c007ac20 c00b643c 0001ee6b bebf3ea0 001d0fb8 0001ee6b 001d0fa8 00000000
ffc0: 0001ee6b bebf3ea0 00000310 00000080 00000000 00000002 00000000 bebf3dc4
ffe0: bebf3c00 bebf3bf0 000340b4 00009590 20000010 001d0fb8 fff8fff8 fff7fff8
Backtrace:
[<bf013000>] (init_module+0x0/0x120 [adtlc554]) from [<c00b7724>] (sys_init_module+0x12f4/0x13b0)
 r5 = C51C6600  r4 = C51C679C
[<c00b6430>] (sys_init_module+0x0/0x13b0) from [<c007ac20>] (ret_fast_syscall+0x0/0x2c)
Code: c033c837 c03a69e4 c03a6a78 e1a0c00d (e92d000f)
Segmentation fault

위방법 말고 ioremap을 사용했을 경우에는

TL16C554_Init : uartbase : 0xc607e000
Unhandled fault: external abort on non-linefetch (0x1008) at 0xc607e000
Internal error: : 1008 [#1]

이렇게 panic이 발생하네요... ;;

현재 보드에서 사용중인 CS0,1,2 쪽을 mapping하면 정상적으로 access가능한데

CS3,4,5영역은 위와 동일한 panic이 발생합니다..

조언 부탁드립니다. 그럼 수고하세요