I have been trying to allocate memory past the end of the kernel in a system
that has more that 1 Gb of memory and have been unsuccessful. My current
machine has an athlon processor and 1.5Gb of memory.
I created a driver with the following code:
#define MAXHM 0x8000000 // 128 Mb
int __init init_module(void)
{
void *kHighMem;
printk(KERN_ERR"before ioremap\n");
kHighMem = ioremap(__pa(high_memory), MAXHM);
printk(KERN_ERR"ioremap ret: %x\n",kHighMem);
return 0;
}
void __exit leave_mod(void) {
iounmap(kHighMem);
printk(KERN_ERR"iounmap passed\n");
printk(KERN_ERR,"module successfully unloaded.\n");
}
I add the line append="mem=xx" to lilo.
If I set "xx" to around 860 or above then ioremap fails. If I set "xx" to
860 or less then ioremap is successful. Has anyone had any experience
trying to allocate a contiguous memory buffer beyond the end of what the
kernel manages in a system with over 1Gb of memory? Any help would be
appreciated in this matter.
Regards,
Rob Murphy
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This archive was generated by hypermail 2b29 : Fri Feb 28 2003 - 22:00:20 EST