In my project, I am trying to build a loadable .ko file for a Linux box with specific linux kernel (uname -r result is 2.6.24-1-486) installed on it.
This Linux box contains no directory named /lib/modules/2.6.24-1-486/build; it contains no related kernel header files for its 2.6.24-1-486 kernel. The remaining docs of it say that some test/unstable Debian release with 2.6.24 kernel may be OK to produce loadable .ko kernel modules for it.
I tried several 2.6.24 kernels, and just got the version verifying failure info below:
# insmod my_kernel_mod.ko
insmod: error inserting 'my_kernel_mod.ko': -1 Invalid module format
# dmesg|tail
my_kernel_mod: disagrees about version of symbol struct_module
my_kernel_mod: disagrees about version of symbol struct_module

Thus, I think I do need the Linux kernel source files (or just header files) with specific kernel version: 2.6.24-1-486. But, I cannot find this kind of 2.6.24-1-486 stuffs, event after I visit the www.kernel.org/ and www.debian.org/.

Does any know how to download the Linux kernel source files (or just header files) with specific kernel version 2.6.24-1-486??

Thanks a lot in advance.

Welcome to LQ.

An available source package can be e.g.
linux-headers-2.6.24-etchnhalf.1-486

.. which means, you will have to update your
kernel to a version , also available as source
like ' linux-image-2.6.24-etchnhalf.1-486 '.

Not all old 'linux-image's have a source counterpart.
Some were used for a very short time, then updated
for various reasons.
.....

Just do : 1) su
2) apt-get install linux-image
.....

I have been developing on CentOS, and to get the kernel headers to setup a working enviroment I run this. I actually think I stopped at gcc because it has kernel-headers as a dependancy.

yum install eclipse-platform
yum install kernel-devel
yum install gcc
yum install kernel-headers