build_rovema_kernel.ksh
Posted by Anonymous on Mon 15th Jan 2024 11:44
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#!/bin/ksh93

#
# build_rovema_kernel.ksh
#
# worse-is-better/simpler rewrite for rovema-082 kernel
#
# Written by Roland Mainz <roland.mainz@nrubsig.org>
#

#
# * install new kernel
#
# $ mount -o remount,rw /
# $ cd /mnt_nfs/work/debian_rt_kernel_src/linux_6_6_5_rt16/dist_files/
# $ dpkg -i *.deb
#
# remove old linux 4.9 kernel:
# $ dpkg -r --force-depends linux-image-4.9.303-rt192
#

#
# * igb_avb.ko installation:
# # igb_avb kernel module must be manually installed on the target system, and the igb.ko kernel module removed
# $ cp dist_files/igb_avb.ko /lib/modules/6.6.5-rt16-rovema082/kernel/drivers/net/ethernet/intel/igb/.
# $ mv /lib/modules/6.6.5-rt16-rovema082/kernel/drivers/net/ethernet/intel/igb/igb.ko /root/igb.ko_disabled
# $ depmod
# $ update-initramfs -k all -u
#
# $ cp /mnt_nfs/work/debian_rt_kernel_src/linux_6_6_5_rt16/dist_files/libigb.so /usr/lib/i386-linux-gnu/libigb_avb.so
#
#

#
#
# * simatic installation:
# $ cp dist_files/simatic-ipc*.ko /lib/modules/6.6.5-rt16-rovema082/kernel/drivers/mfd/.
# $ depmod
# $ update-initramfs -k all -u
#
# * install closed-source firmware data:
# $ cd /
# $ tar -xf /mnt_nfs/work/debian_rt_kernel_src/linux_6_6_5_rt16/dist_files/linux_firmware_git_lib_firmware_i915_20231211.tar.bz2
# $ update-initramfs -k all -u
#

#
# Installation:
#

#
# Login into target machine:
# $ ksh ~/work/nrubsigsvn/gisburn/scripts/sshnfs/sshnfs.ksh -o NFSURL=ssh+nfs://derfwpc5131/export/home2/rmainz target@fe80::d6f5:27ff:fe2b:4330%enp2s0
#

#
# Install updated Debian Jessie packages:
# $ cd /mnt_nfs/work/jessie_target_packages/
# dpkg -i --force-conflicts console-*.deb # conflicts with "plymouth"
# dpkg -i *.deb
#

#
# Update Linux kernel boot args in grub:
# $ vi /etc/default/grub
# GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 intel_pstate=disable nosoftlockup nmi_watchdog=0 idle=poll nohz=on i915.disable_power_well=0 i915.enable_rc6=0 i915.enable_dc=0 i915.enable_guc=2"
# $ update-grub
#

#
# fix binfmt (Debian 'Jessie' bug):
# printf 'ksh\nmagic\n0\n\\x0B\\x13\\x08\n\n/bin/ksh\n\n\n\n\n' >'/var/lib/binfmts/ksh'
#


#
# build Linux kernel v6.6.5-rt16
#

function build_kernel
{
        set -o errexit
        set -o nounset

        # subshell so CWD remains unchanged on return
        (
                mkdir builddir_kernel
                cd builddir_kernel/

                git clone -b 'v6.6.5-rt16' git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git

                cd linux-rt-devel/
                cp '../../myconfig_linux_v6_6_5_rt16.config' '.config'

                #
                # fixme: add patches here
                # - rt RCU patch
                # - default boot args patch
                # - i915 patches
                # - rt udev dir
                #

                time nice -n 19 ksh -c 'CC="gcc -m32" make -j2 bindeb-pkg 2>&1 | tee buildlog.log'

                cd ..

                cp linux-headers-*_i386.deb     "${c.dist_files_dir}/"
                cp linux-image-*_i386.deb       "${c.dist_files_dir}/"
                cp linux-libc-*_i386.deb        "${c.dist_files_dir}/"
        )

        print '# build_kernel OK'

        return 0
}


#
# build custom igb_avb module
#
function build_igbavb
{
        set -o errexit
        set -o nounset

        # subshell so CWD remains unchanged on return
        (
                mkdir builddir_igbavb
                cd builddir_igbavb/

                git clone https://github.com/Avnu/igb_avb.git
                git clone https://github.com/wheybags/glibc_version_header.git

                cd igb_avb/

                # switch to commit 6c115ee89c88f6284d1407244b4a47586c3332d,
                # which is known to work with Linux 6.6.5-RT16
                git checkout '86c115ee89c88f6284d1407244b4a47586c3332d'

                #
                # apply patches
                #
                # fixme:
                # - pciid patch is missing
                # - igb patches may need backport (bfp ?)
                #
                git am <'../../0001-libigb-Use-PTHREAD_PRIO_INHERIT-for-mutex-to-avoid-r.patch'
                git am <'../../0002-Disable-pci_-_pcie_error_reporting-for-Linux-kernels.patch'

                #
                # build kernel module
                #
                cd kmod/
                CC="gcc -m32" make -j4 -C "$PWD/../../../builddir_kernel/linux-rt-devel/" KSRC="$PWD/../../../builddir_kernel/linux-rt-devel/" M=$PWD
                cp igb_avb.ko   "${c.dist_files_dir}/"
                cd ..

                #cp simatic-ipc*.ko /lib/modules/6.6.5-rt16-rovema082/kernel/drivers/mfd/.
                # build libigb.a
                #
                cd lib
                CC="gcc -m32 -pthread -include $PWD/../../glibc_version_header/version_headers/x86/force_link_glibc_2.18.h" make all

                #
                # build shared library vesion of libigb.a
                #
                gcc -m32 -pthread -shared -fPIC -o libigb_avb.so -Wl,--whole-archive libigb.a -Wl,--no-whole-archive -lpthread -lrt

                # make sure we do not pick up libc symbols beyond glibc 2.19
                glibcversymmatch="$(strings 'libigb_avb.so' | grep -E 'GLIBC_2\.[2-9][0-9]')" || true
                if [[ "${glibcversymmatch}" != '' ]] ; then
                        print -u2 -f '# build_igbavb: glibc ELF ref for glibc > 2.19 found: %q\n' "$glibcversymmatch"
                        return 1
                fi

                cp libigb_avb.so        "${c.dist_files_dir}/."
        )

        print '# build_igbavb OK'

        return 0
}

function build_simatic
{
        set -o errexit
        set -o nounset

        # subshell so CWD remains unchanged on return
        (
                mkdir builddir_simatic
                cd builddir_simatic/

                svn checkout http://svn.rovema.de/repos/bootimage/branches/dev027_kernel5_15/rovema_simatickernelmodules/simatic-ipc-modules-lsp-v1.2.0RC1/
                cd simatic-ipc-modules-lsp-v1.2.0RC1/
                make -C "$PWD/../../builddir_kernel/linux-rt-devel/" KSRC="$PWD/../../builddir_kernel/linux-rt-devel/" M=$PWD

                cp ./simatic-ipc.ko             "${c.dist_files_dir}/"
                cp ./simatic-ipc-leds.ko        "${c.dist_files_dir}/"
                cp ./simatic-ipc-wdt.ko         "${c.dist_files_dir}/"
                cp ./simatic-ipc-batt.ko        "${c.dist_files_dir}/"
                cp ./simatic-ipc-sensors.ko     "${c.dist_files_dir}/"
                cp ./simatic-ipc-ps.ko          "${c.dist_files_dir}/"
                cp ./simatic-ipc-nvram.ko       "${c.dist_files_dir}/"
        )

        print '# build_simatic OK'

        return 0
}

function build_firmware_tarball
{
        set -o errexit
        set -o nounset

        typeset -r linux_firmware_git_tag='20231211'
        typeset -r tarball_filename="linux_firmware_git_lib_firmware_i915_${linux_firmware_git_tag}.tar.bz2"

        # subshell so CWD remains unchanged on return
        (
                mkdir build_firmware_tarball
                cd build_firmware_tarball/

                git clone -b "${linux_firmware_git_tag}" git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
                mkdir -p 'lib/firmware/i915'
                ln linux-firmware/i915/* 'lib/firmware/i915/.'
                tar -cvf - 'lib' | pbzip2 >"${tarball_filename}"
                cp "${tarball_filename}" "${c.dist_files_dir}/"
        )
}

#
# main
#

# use ksh93 builtins
export PATH="/opt/ast/bin/:/usr/ast/bin:$PATH"
builtin mkdir

# keep all global script data in a compound variable
# so we can use $ print -u2 -v c # for debugging
compound c

typeset c.dist_files_dir="$PWD/dist_files"
mkdir -p "${c.dist_files_dir}"


#
# build packages
#
build_kernel
build_igbavb
build_simatic
build_firmware_tarball

#
# list resulting packages
#
ls -l "${c.dist_files_dir}"

# EOF.