Messages in this thread | | | From | "Rob Murphy" <> | Subject | 2.5.62 ioremap fails | Date | Mon, 24 Feb 2003 12:21:01 -0500 |
| |
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
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |