Hi,
I am trying to read the BCSR register of my PPC460ex board.But when I load
the module, then I get the "Machine Check Error".
I am not sure if I missed out something.
I would really appreciate it if somebody could help me on this.
I have posted the source code below, as well as the complete message.
Thanks,
efti
Source code
------------
#include <linux/init.h> // to use module_init and module_exit
#include <linux/module.h>// macros for modules
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <asm/io.h>
static unsigned int reg1 = 1; // test data
static unsigned int reg2 = 2; // test data
static unsigned int reg3 = 3; // test data
static unsigned int *virtual_base = 0; // remapped address
static unsigned long mem_addr = 0xC0000000;// IP base address
static unsigned long mem_size = 0x10000; // 64KB
int io_driver_init(void)
{
int i;
if(check_mem_region(mem_addr,mem_size))
{
printk("simp_mult: memory already in use\n");
return -EBUSY;
}
// request memory for the device
request_mem_region(mem_addr,mem_size,"simp_mult");
// remap
virtual_base = ioremap(mem_addr,mem_size);
printk("ioremap: Virtual Address %08x\n",(unsigned int)virtual_base);
if( virtual_base==0 )
{
printk("ioremap failed\n");
return -EBUSY ;
}
else
{
unsigned int value;
value = in_be32(virtual_base);
printk("Data to Read : %08x\n",value);
return 0; // indicate a success
}
}
void io_driver_exit(void)
{
printk("Release Memory Region...\n") ;
iounmap(virtual_base) ;
release_mem_region(mem_addr,mem_size) ;
}
module_init(io_driver_init);
module_exit(io_driver_exit);
--
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