编译FreeBSD内核

1,首先/boot应当最少保留1G左右的空间.
2,在当前内核位置复制一个复本.当前内核位置是/usr/src/sys/i386(amd64)/conf.
3,对内核进行适当的修改,以适合当前使用环境为宜.
4,然后按如下步骤进行编译.

cd /usr/src    #(or to the directory containing your source tree).
make buildworld
make buildkernel KERNCONF=YOUR_KERNEL_HERE    #(default is GENERIC).
make installkernel KERNCONF=YOUR_KERNEL_HERE    #(default is GENERIC).

#[steps 3. & 4. can be combined by using the "kernel" target]

reboot    #(in single user mode: boot -s from the loader prompt).
fsck -p
mount -u /
mount -a -t ufs
swapon -a
mergemaster -p
cd /usr/src
make installworld
make delete-old
mergemaster    #(you may wish to use -U or -ai).
reboot
make delete-old-libs    #(in case no 3rd party program uses them anymore)