Device node

[Altera_Forum]

Hi, 

 Now after I boot uclinux I use the command mknod to create my "/dev/name(device)" to control my hardware.  Also I have done a script to do it when the system's boot, but I would like to know if there is a command that creates this virtual folder when I load my device driver, some command that I can integrate inside my modul.  At first I used the command "device_create" but It didn't go, maby I am wrong and I can't do this inside my module to create the folder in /dev associating the major number.  Thanks

[Altera_Forum]

You can create a nod with the help of the romfs_list in ~/nios2-linux/uClinux-dist/vendors/Altera/nios2/romfs_list 

just add it to the list

[Altera_Forum]

Thanks for the answer but I know it. In this way "/dev/driver" is always built, I ask for a command or something thats makes "dev/driver" appear at the same time when I do an insmod of the driver. 

 Lot of thanks anyway.

[Altera_Forum]

You may check the "mdev" of busybox, which is similar to udev in creating dev nodes on the fly. 

 - Hippo

[Altera_Forum]

Hi, 

  This is what I was looking for, thanks for the answer.   I have tested the command mdev-s in the terminal, but I would like that It do it automatic when I insert a module.  I have read the file “mdev.txt”, as I understand I have to introduce two lines of code(1- About hotplugging,2-mdev) in the init script( For me /etc/rc).   The problem is when I recompiled to make the zImage again, lines of code that I have introduced were erased.    I don't know if it is the correct "init script" or if I have to change something in menuconfig to preserve the code that I have introduced.     Thanks a lot.

[Altera_Forum]

Hi, 

 There is a post in Nioswiki answering my question.  Thanks

[Altera_Forum]

If the Kernel is configured appropriately, you can dynamically create a device note in your module's init code using alloc_chrdev_region(). 

 -Michael