Resflash

Building

notes for building resflash for octeon (edgerouter lite). Octeon resflash images require a custom kernel. Resflash loads this into a fat partition, and the kernel needs to know where to find the root partition.

If you want to avoid cross compiling (I did), first do a basic install of openbsd per here. Be sure to include the comp set.

example setlist:

   [X] bsd           [X] base65.tgz    [ ] game65.tgz    [ ] xfont65.tgz
   [X] bsd.mp        [X] comp65.tgz    [ ] xbase65.tgz   [ ] xserv65.tgz
   [ ] bsd.rd        [ ] man65.tgz     [ ] xshare65.tgz

change fstab, make sure it's noatime and softdep (less iops to your usb stick, make it live longer) , e.g. below:

create a user to do the building.

useradd exampleuser
user mod -G wsrc exampleuser

Then mount /usr/src on external storage (to avoid unnecessary compile related iops to usb), like nfs.

Get the (6.5 in this example) stable source:

cd /usr
cvs -qd anoncvs@anoncvs.ca.openbsd.org:/cvs checkout -rOPENBSD_6_5 -P src

Then run below script to create the kernel:

#!/bin/ksh
export DESTDIR=/usr/dest RELEASEDIR=/usr/release MACHINE='octeon' NCPU=1 MYKERNEL=GENERIC DATEARG='+%H:%M:%S' part=d 
mkdir ${RELEASEDIR}
chown build:wobj ${RELEASEDIR}
echo "$(date "${DATEARG}") ${0}: ----- Building bsd.${part} -----"
cd /usr/src/sys/arch/${MACHINE}/conf
sed "/^config.*bsd/s/config.*/config bsd root on sd0${part} swap on sd0b/" \
GENERIC > GENERIC.${part}
sed "/^include.*GENERIC/s/GENERIC/GENERIC.${part}/" GENERIC.MP > \
GENERIC.MP.${part}
config ${MYKERNEL}.${part}
rm GENERIC.${part} GENERIC.MP.${part}
cd ../compile/${MYKERNEL}.${part}
make -j ${NCPU}
cp obj/bsd ${RELEASEDIR}/bsd.${part}
cd ..
rm -rf ${MYKERNEL}.${part}
rm -rf /usr/obj/sys/arch/${MACHINE}/compile/${MYKERNEL}.${part}
cd ${RELEASEDIR}
cksum -a sha256 -b bsd.d >> SHA256.bsd.d

Now extract the distribution octeon sets from the matching release to /usr/release and you should be able to run build_resflash.sh and create a working image for resflash. Be sure to run build_resflash.sh from an octeon system as well. Partitions created by build_resflash.sh on a different architecture are not mountable from an octeon system.