[Bug 227808] FreeBSD-11.1-STABLE-amd64-bootonly.iso fails to mount root w/ error 19 on HP DL360 G8 and G9 via PXE

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227808

--- Comment #22 from vmiller at verisign.com ---
FWIW, one can workaround this problem by deploying a bootonly ISO configured
with an MFS_IMAGE. EFI_STAGING_SIZE may need adjusting to accommodate larger
objects; It defaults to 64. EFI_STAGING_SIZE can be defined within make.conf,
release.conf, or on the command line. While not illustrated below,
EFI_STAGING_SIZE is implicitly defined specifying a make.conf that includes the
knob in the environment via MAKE_CONF.

MFS_IMAGE is necessary because the project’s bootonly ISO fails to PXE boot at
mountroot() w/ error 19 indicating the boot media cannot be located. The
hardware platform is HP DL360g9 in UEFI boot mode. MFS_IMAGE implies a MD_ROOT
root filesystem.

The build system doesn't seem provide a mechanism to build a default MFS_IMAGE
and is therefore done outside the context of a build. The following procedure
builds a binary distribution from the source tree in it's default form
(including the default bootonly.iso). It rebuilds the bootonly.iso after
generating a root partition and MDROOT kernel.

# Create CHROOTDIR w/ GENERIC kernel (also builds binary release)
root # cd ~/projects/freebsd
root # git checkout releng/11.2
root # release/release.sh -c release/release.conf

# Create root.part from ${OBJDIR} bootonly
root # cd ${CHROOTDIR}/usr/obj/usr/src/release
root # rm bootonly/boot/kernel/kernel
root # rm bootonly/boot/geom_md.ko
root # echo "/dev/ufs/FreeBSD_Install / ufs rw 0 0" > bootonly/etc/fstab
root # makefs -B little -o label=FreeBSD_Install root.part bootonly/
root # cd .. && mkdir -p sys/MDROOT
root # mv release/root.part sys/MDROOT/

# Build MDROOT kernel
root # cat ${CHROOTDIR}/usr/src/sys/amd64/conf/MDROOT
include GENERIC
ident MDROOT

makeoptions     MFS_IMAGE=root.part
root # eval chroot ${CHROOTDIR} env KERNCONF=MDROOT make \ 
    -C /usr/src buildkernel

# Build bootonly ISO w MDROOT kernel
root # mount -t devfs devs ${CHROOTDIR}/dev
root # chflags -R noschg ${CHROOTDIR}/usr/obj/usr/src/release/bootonly && \
    rm -rf ${CHROOTDIR}/usr/obj/usr/src/bootonly
root # eval chroot ${CHROOTDIR} env KERNCONF=MDROOT \ 
    NOPKG=1 NOSRC=1 NODOC=1 NOPORTS=1 make -C /usr/src/release bootonly.iso

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