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This post by Free and Open Source Software Knowledge Base shows us how to build and install a custom kernel in FreeBSD-10.

Go to the kernel source directory which contains the configurations.

cd /usr/src/sys/amd64/conf

Create a folder named kernel in the home directory of root user i.e. /root.

mkdir /root/kernels

Create a soft link in the /usr/src/sys/amd64/conf named “MYKERNEL” which links to /root/kernels/MYKERNEL file.

cp GENERIC /root/kernels/MYKERNEL
ln -s /root/kernels/MYKERNEL

Goto the folder created above.

cd /root/kernels/

Edit the file “MYKERNEL” and make the following change. This line helps us to create the new kernel which is a combination of a generic kernel and the extra features added. The following line includes the features available in a generic kernel

include         GENERIC

The other additional lines specify the features to be added in the kernel to be created.
For Example:

cpu             HAMMER
ident           GENERIC

makeoptions     DEBUG=-g                # Build kernel with gdb(1) debug symbols
makeoptions     WITH_CTF=1              # Run ctfconvert(1) for DTrace support

options         SCHED_ULE               # ULE scheduler
options         PREEMPTION              # Enable kernel thread preemption
options         INET                    # InterNETworking
options         INET6                   # IPv6 communications protocols
options         TCP_OFFLOAD             # TCP offload
options         SCTP                    # Stream Control Transmission Protocol
options         FFS                     # Berkeley Fast Filesystem
options         SOFTUPDATES             # Enable FFS soft updates support
options         UFS_ACL                 # Support for access control lists
options         UFS_DIRHASH             # Improve performance on big directories
options         UFS_GJOURNAL            # Enable gjournal-based UFS journaling
options         QUOTA                   # Enable disk quotas for UFS
options         MD_ROOT                 # MD is a potential root device

To build a file which contains all available options, run the following commands.

cd /usr/src/sys/amd64/conf
make LINT

Goto the main source folder.

cd /usr/src

Build and Install the new kernel with reference from the file “MYKERNEL”.

make buildkernel KERNCONF=MYKERNEL
make installkernel KERNCONF=MYKERNEL

Now reboot the machine to boot into the new kernel you just created now.

Original post: https://fosskb.wordpress.com/2014/11/20/building-and-installing-custom-kernel-in-freebsd-10/

The FreeBSD Release Engineering Team is pleased to announce the availability of FreeBSD 10.1-RELEASE. This is the second release of the stable/10 branch, which improves on the stability of FreeBSD 10.0-RELEASE and introduces some new features.

Some of the highlights:

• The new console driver, vt(4), has been added.
• Support for FreeBSD/i386 guests has been added to bhyve(4).
• The bhyve(4) hypervisor now supports booting from a zfs(8) filesystem.
• Support for SMP was added to the armv6 kernels and enabled by default in the configuration files for all platforms that contain multi-core CPUs.
• Initial support for UEFI boot has been added for the FreeBSD/amd64 architecture.
• Support has been added to cache geli(8) passphrases during system boot.
• Support for the UDP-Lite protocol (RFC 3828) has been added to the IPv4 and IPv6 stacks.
• The new filesystem automount facility, autofs(5), has been added.
• The sshd(8) rc.d(8) startup script now generates ED25519 sshd(8) host keys if keys do not already exist when ssh_keygen_alg() is invoked.
• OpenSSH has been updated to version 6.6p1.
• The nc(1) utility has been updated to match the version in OpenBSD 5.5.
• Sendmail has been updated to 8.14.9.
• The unbound(8) caching resolver and ldns have been updated to version 1.4.22.
• OpenPAM has been updated to Ourouparia (20140912).
• OpenSSL has been updated to version 1.0.1j.
• The pkg(8) package management utility has been updated to version 1.3.8.

For a complete list of new features and known problems, please see the online release notes and errata list, available at:

• https://www.FreeBSD.org/releases/10.1R/relnotes.html
• https://www.FreeBSD.org/releases/10.1R/errata.html

Download the ISO/image file from here: ftp://ftp.freebsd.org/pub/FreeBSD/releases/ISO-IMAGES/10.1/

Full announcement: https://www.freebsd.org/releases/10.1R/announce.html