# Redirected to freebsd-questions, from freebsd-newbies.
# Please do NOT post technical questions to the freebsd-newbies list.
# Followups set to freebsd-questions.
On 2005-03-10 10:25, h p [EMAIL PROTECTED] wrote:
I'd like to recompile my kernel for disk encryption support (options
GEOM_BDE). I am right now running an out-of-the-box 5.3-RELEASE
kernel.
I noticed that some kernel modules I use are missing in the GENERIC
kernel configuration file (such as ext2fs and snd_emu10k1).
The GENERIC kernel is just what the name suggests: a generic kernel
configuration. It's also the one that is distributed with the FreeBSD
release CD-ROMs as the default kernel.
You can always add whatever you want to a custom kernel configuration
file, say LOCAL, and use the kernel built from that config file.
I am worrying that these features will not work if I install a new
kernel. Of course, I could just try and restore the old kernel, if
not. With Linux, there is a solution to get the current kernel
configuration (in /proc/config.gz). Is there such a thing under
FreeBSD?
The kernel installation process, if you follow the instructions from
/usr/src/UPDATING or the Handbook, should be:
# cd /usr/src
# make KERNCONF=LOCAL installkernel
This will keep a backup of the GENERIC kernel in:
/boot/kernel.old
You can also make a backup copy of the GENERIC kernel, if you want to
keep it safe from continuous installkernel runs, by manually copying
/boot/kernel to /boot/kernel.GENERIC right after FreeBSD has been
installed:
# cd /boot
# cp -Rp kernel kernel.GENERIC
Then, if anything does wrong, you can always interrupt the boot loader
before a broken kernel boots and boot into kernel.GENERIC. This is as
easy as hitting ESC or any key that is not ENTER, and writing at the
OK prompt of the loader:
OK unload
OK boot kernel.GENERIC
I admit I haven't yet quite understood how the kernel recompilation
works. How do I configure features as a module?
Anything that is not compiled in the kernel by the kernel config file
is built as a module and installed as a *.ko file in /boot/kernel.
Also, there are some features, which don't seem to be documented...
at least not in the NOTES file.
You're looking at the wrong NOTES file. There are two NOTES files on
any given architecture that FreeBSD supports:
1) The architecture-independent NOTES file, listing options common
to all the possible architectures: /usr/src/sys/conf/NOTES.
2) The architecture-dependent NOTES in /usr/src/sys/ARCH/conf/NOTES,
where ARCH is one of: i386, sparc64, amd64, alpha, powerpc, etc.
ext2fs is an example. Is there a comprehensive list anywhere?
The two NOTES files (architecture independent and architecture
dependent) should be all you need.
- Giorgos
___
freebsd-questions@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-questions
To unsubscribe, send any mail to [EMAIL PROTECTED]
