I am attempting to write to a CPLD mapped to the EBC port of a AMCC 440EP. When I attempt to write using an unsigned variable
ie. unsigned *pbase = (unsigned char *)ioremap64(0x8F000000,0x1000000);
I get a kernel access of bad area, sig: 11 fault. However, if I change to an unsigned char ie. unsigned char *pbase = (unsigned char *)ioremap64(0x8F000000,
0x1000000); The system doesn't crash. I need to write using an unsigned. Does any one have any ideas what I am doing wrong?
I am using 2.6.24 Xenomai Denx. 4.2. I am porting a working 2.6.14 project that was developed with FSM Labs RT Linux (now owned by WindRiver).
//-----------------------------------------------------------------------
// initialize module -- this what is called when you do insmod ./ubus.ko
//-----------------------------------------------------------------------
static int __init ubus_init_module (void)
{
int i;
unsigned ofs[20] =
{0x400000,0x400100,0x500000,0x500100,0x600000,0x600100,0x700000,0x700100,
0x608000,0x608100,0x708000,0x708100,0x610000,0x610100,0x710000,0x710100,
0x618000,0x618100,0x718000,0x718100};
unsigned *pbase = (unsigned *)ioremap64(0x8F000000,
0x1000000);
unsigned *p;
for( i = 0; i < 20;i++)
{
p = pbase + ofs[i] + 0x34;
*p = 0x25500;
printk(KERN_ALERT "p = %X\r\n",p);
}
iounmap(pbase);
PRINTK("initializing module ubus\n");
i = register_chrdev (UBUS_MAJOR, UBUS_NAME, &ubus_fops);
if (i != 0) return - EIO;
return 0;
}
-bash-3.2# insmod
ubus.ko
Oops: kernel access of bad area, sig: 11
[#1]
NIP: d1068054 LR: d1068038 CTR:
00000000
REGS: cf489d70 TRAP: 0300 Not tainted
(2.6.24.2)
MSR: 00029000 <EE,ME> CR: 08004022 XER:
00000004
DEAR: d61000d0, ESR:
00800000
TASK = cf45c410[309] 'insmod' THREAD:
cf488000
GPR00: d1068038 cf489e20 cf45c410 d5100000 d6100000 00000000 00000000
cf4467f8
GPR08: 000007f8 d1060000 8ffff000 00000000 28004028 1004950c 00000000
d509c1e4
GPR16: cffe1ce0 d5093a04 00000000 00000036 00000036 d5093310 c003cb00
d5081000
GPR24: 00000026 00000026 d5093464 cf489e28 d1
0664c4 00025500 00000026 d1066a60
NIP [d1068054] ubus_init_module+0x54/0x190
[ubus]
LR [d1068038] ubus_init_module+0x38/0x190
[ubus]
Call
Trace:
[cf489e20] [d1068038] ubus_init_module+0x38/0x190 [ubus]
(unreliable)
[cf489e90] [c003df74] sys_init_module
+0x174/0x15e0
[cf489f40] [c0001ac4] ret_from_syscall
+0x0/0x3c
Instruction
dump:
480000cd 3c808f00 3ca00100 38600000 480000cd 80810008 3fa00002
5484103a
7c841a14 3d20d106 63bd5500 3b8964c4 <93a400d0> 7c7e1b78 388400d0
7f83e378
Segmentation fault
-bash-3.2# insmod
ubus.ko
p = D5500034
p = D5500134
p = D5600034
p = D5600134
p = D5700034
p = D5700134
p = D5800034
p = D5800134
p = D5708034
p = D5708134
p = D5808034
p = D5808134
p = D5710034
p = D5710134
p = D5810034
p = D5810134
p = D5718034
p = D5718134
p = D5818034
p = D5818134
initializing module ubus
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