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Can not modprobe any driver

Altera_Forum
Honored Contributor I
1,053 Views

Hi guys 

 

I have strange situation. Some time ago I realized that I can not load any module to Linux (I'm working with MMU). I wrote then simple driver to check: 

# include <linux/init.h># include <linux/module.h> 

 

 

 

 

static int __init hello_init(void) 

printk(KERN_ALERT "Hello module is running\n"); 

 

 

return 0; 

 

 

static void __exit hello_exit(void) 

printk(KERN_ALERT "Hello module is exit\n"); 

 

 

module_init(hello_init); 

module_exit(hello_exit); 

 

When I use this drives as module in configuration, I put modprobe hello and system hangs. But when I add this driver to the kernel as static driver this driver is loading without problems. I see on the console:ttyJ0 at MMIO 0x4001450 (irq = 2) is a Altera JTAG UART 

console [ttyJ0] enabled, bootconsole disabled 

console [ttyJ0] enabled, bootconsole disabled 

ttyS0 at MMIO 0x4001400 (irq = 1) is a Altera UART 

hello module is running 

mice: PS/2 mouse device common for all mice 

TCP cubic registered 

NET: Registered protocol family 17 

Freeing unused kernel memory: 2720k freed (0xc21cd000 - 0xc2474000) 

Welcome to 

____ _ _ 

/ __| ||_|  

_ _| | | | _ ____ _ _ _ _  

| | | | | | || | _ \| | | |\ \/ / 

| |_| | |__| || | | | | |_| |/  

| ___\____|_||_|_| |_|\____|\_/\_/ 

| | 

|_| 

 

 

For further information check: 

http://www.uclinux.org/ 

 

 

 

 

 

 

BusyBox v1.16.2 (2013-06-14 13:30:28 CEST) hush - the humble shell 

Enter 'help' for a list of built-in commands. 

 

 

root:/>  

 

What is here going on? Why I can not load any driver? When I use insmod the situation is the same... :/
0 Kudos
2 Replies
Altera_Forum
Honored Contributor I
62 Views

Hi, 

 

 

--- Quote Start ---  

When I use this drives as module in configuration, I put modprobe hello and system hangs. But when I add this driver to the kernel as static driver this driver is loading without problems.  

--- Quote End ---  

 

 

Please refer the next once. 

 

http://www.alteraforum.com/forum/showthread.php?t=18802&page=5 # 48 

 

Kazu
Altera_Forum
Honored Contributor I
62 Views

That's great! :) 

 

I made changees as you mentioned in kernel.c for using kmalloc intead vmalloc and now loading modules is working. 

 

But this situation is really really strange. I used insmod while I was programming my module for custom hardware in FPGA in two last weeks. I loaded modules via NFS. Everything was ok... When my driver was finished I changed to put it into the kernel and I didn't use dynamic loading. And sometime ago I tried load the driver again and it was not working... I didn't know what was going on. But now when I made changes as you Kazu said it comes back to work... But befere it wokrs with vmalloc I think..
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