Hi All,

I have edited a file option.c from this location /drivers/usb/serial/option.c
Do i have build kernel?
Is there any way that i can compile this file?

Appreciate for the answers.

Thank You.

It depends whether or not the USB serial driver is a module or internal to the kernel. Odds are that it is included in the kernel. Whether you have to rebuild your kernel or your modules, that's the capability which you need. What you need to do first is find what kernel you do have and obtain all the source for it to be able to execute a build.

Thanks rtmistler for your replay. I have added a #define for the new device in option.c, Do i have to build the kernel for couple of line? Is there is way to compile the option.c and replace the object file?

If it's part of the kernel you have to rebuild the kernel because the result is one file.

If it's included as a module then you can rebuild just the one module, but you'd have to rebuild the entire module that uses that source. For instance a serial USB driver module may use a large number of source files, including that one, and therefore you'd have to rebuild that entire driver module.

My belief though is that a core file like USB serial is likely included in the kernel.

What about in this case, can i rebuild this option.c?
What is the procedure?

Read kernel howto from TLDP site.

Not opening,

After replacing the new object file (optiom.ko) to old file (option.ko), will there be any issues?

Do i have to build only option.c or entire Serial folder .c files or USB folder files?

The process of building a .ko module is more involved than a simple compiled .c file. I would look for a way to rebuild the directory and let 'make' do it if at all possible.

I understand you not opening the kernel howto, but you might at least grok the index to see if he has comments on this buried somewhere. Once you understand the university reports system, it's easier to find your way around a howto. Nothing significant can go in the first half of the document; Things never get shortened or removed, only added; It's 'never mind the quality - feel the width!'

Thanks, Now its opening.

Thanks, for replay. Any issues will arise after building and replacing it (all in directory)?

You should keep a backup of the original by renaming that to like <name>.ko.sav, put the new one in, owned by root and privileged as the other files are. Then you can reboot to test it.

Do i have to compile one option.c file or All Serial folder files?

I have to this on Raspberry PI, any build tools required or any setup is required?

MODERATOR: Recommend this thread get moved to the Linus - Embedded and Single Board Computer forum

Yeah, you need to have the capability to build the kernel and modules for your Raspberry Pi and also the capability to build that on a different system, thus using a cross compiler.

This isn't a simple one-step thing you're asking by the way.

General overview: http://elinux.org/RPi_Kernel_Compilation
Very good tutorial: http://sysprogs.com/VisualKernel/tut...y/buildkernel/

I recommend you follow that tutorial and give it a very honest try. At least read the overview and tutorial to discover just how involved this subject is.

Thanks, i had compiled Linux from the sources but this time it looked liked a bit deep surgery. So took suggestions of you people.

Finally, Do i have to compile one file or entire folder?

Thank You.