linux-kernel - Re: Getting out-of-kernel modules compiled

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Date:	Wed, 21 Jan 2009 18:22:48 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
Cc:	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: Getting out-of-kernel modules compiled

On Wed, Jan 21, 2009 at 10:57:25AM -0500, linux-os (Dick Johnson) wrote:
> 
> Back in 2004, we make the following to compile
> out-of-kernel modules. It worked.
> 
> Now, the kernel build doesn't "know" how to handle "asm.S"
> files and always thinks a "name.o" file is the result of
> a "name.c" file, so I can't buld them no  matter how hard
> I try!
> 
> What do I need to do????
> 
> #
> #	Project Makefile for kernel versions over 6 
> #	Created 05-OCT-2004	Richard B. Johnson
> #
> 
> VER	:=	$(shell uname -r)
> PWD	:=	$(shell pwd)
> 
> all:		driver
> 
> driver:
>  		make V=1 -C /usr/src/linux-$(VER) SUBDIRS=$(PWD) modules
> 
> rtc_hwr.o:	rtc_hwr.S
>  		as -o $@ $<
> 
> obj-m		= 	rtc.o
> obj-m		+= 	rtc_hwr.o

kbuild has never (at least for a very long time) not
supported to implement a module only in assembler.

So you will have no luck trying to build the
module rtc_hrw.ko

What you can do is to define a module like htis:
obj-m := dick.o
dick-y := rtc.o rtc_hwr.o

This will properly build rtc_hwr.S => rtc_hwr.o

	Sam
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