How to RECOMPILE your KERNEL under NetBSD

	There are two ways you can do this. The first would be to use
union mounts and access the NetBSD source tree stored in the SIPB AFS
cell.  Union mounts let you transparently access a directory with
modifications going somewhere else.  To use union mounts, log in as root
and do:

mkdir /usr/src
attach -n netbsd
mount -t union /usr/src /mit/netbsd/release/athena-7.7.2/netbsd-1.2/src
cd /usr/src/sys/arch/i386/conf/

At this point, you'll see several kernel configuration files (the ones
in all CAPS).  The two most useful ones will be ATHENAOTHER and
ATHENAADP. ATHENAOTHER is all currently supported hardware except for
Adaptec SCSI adapters.  ATHENAADP is all currently supported hardware
except non-Adaptec SCSI adapters. Choose the kernel confif file that's
correct, and 

cp CONFIGFILE MYKERNELNAME

where CONFIGFILE and MYKERNELNAME are replaced with the appropriate file
names.  Then, edit MYKERNELNAME and make the changes you need to make.
When you have a kernel config file you'd like to compile for, type

config MYKERNELNAME
cd ../compile/MYKERNELNAME
make depend
make

To install your new kernel after it it compiled, usethe following
commands:

mv /netbsd /netbsd.old
cp netbsd /netbsd

and then reboot your machine to test the new kernel.

If you want to recompile, you'll have to redo the union mount each time,
as it is broken when the machine is rebooted.  You can only do a union
mount to local disk; you can't do a union mount into your Athena home
directory, for instance.


The second way you could do this process would be to copy the source
tree locally. At this time, it takes about 30 MB of disk space for the
sources, although this can be reduced by removing all of the platform
specific directories under arch/except for i386.  To copy the source
locally, log in as root and:

attach -n netbsd
cp -r /mit/netbsd/release/athena-7.7.2/netbsd-1.2/src  /usr

This will copy all of the sources locally.  Then, to build a kernel, use
a similar process to that discussed above:

cd /usr/src/sys/arch/i386/conf/

Edit the appropriate config file.  Then

configure MYKERNELNAME
cd ../compile/MYKERNELNAME
make depend
make

When the build is finished, install the new kernel by

mv /netbsd /netbsd.old
cp netbsd /netbsd

and rebooting.