buildworld upgrading advise please.

[Marwan Sultan]

Hello Gurus

  Im on FreeBSD 6.1-R decided to upgrade the src tree and for security 
reasons only
  so i did the following
cvsup srcall and ports (RELENG_6_1)
changed /etc/make.conf to
CFLAGS= -O -pipe
NO_PROFILE=
cd /usr/src
# make buildworld
# make buildkernel
# make installkernel
# reboot
the following steps not from single user, just root, it refused to run from 
single user
# mergemaster -p
# make installworld
# mergemaster
# reboot

Till here no errors and everything seems allright!
the output of uname -a is
FreeBSD  6.1-RELEASE-p7 FreeBSD 6.1-RELEASE-p7 #0: Fri Sep 29 01:37:30 AST 
2006     root@:/usr/obj/usr/src/sys/GENERIC  i386

Is this enough ?
Some websites has only these steps, but in the handbook asking to
update /etc, recomiple the base system and many others..
Can someone comment about my steps and advice if anything more is needed.
pluse, why all was okay from root user not single user mode,
and why it didnot work from single user mode.

Thank you.

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