• chengcui
• kernel_config

kernel configuration and debug

FreeBSD next boot

root@fbsd:/usr/src # nextboot -k kernel.safe
root@fbsd:/usr/src # ll /boot/nextboot.conf
-rw-------  1 root wheel   43B Apr 15 10:48 /boot/nextboot.conf
root@fbsd:/usr/src # cat /boot/nextboot.conf
nextboot_enable="YES"
kernel="kernel.safe"
root@fbsd:/usr/src #

FreeBSD install kgdb

cc@fbsd:~ % cd /usr/ports/devel/gdb
cc@fbsd:/usr/ports/devel/gdb % sudo make install clean BATCH="YES"

FreeBSD Kernel config file options

• To compile with -O0, update this line in the kernel config file

makeoptions     DEBUG="-g -O0"

FreeBSD build a new kernel

root@fbsd:/usr/src # make -j`sysctl -n hw.ncpu` kernel KERNCONF=MYKERNEL > /tmp/kernel.log

Ubuntu Linux build a new kernel

apt install build-essential libncurses-dev bison flex libssl-dev libelf-dev packaging-dev fakeroot bc git python3 dwarves
cp /boot/config-$(uname -r) .config
make olddefconfig
make localmodconfig
make menuconfig
make clean
make -j `nproc` bindeb-pkg LOCALVERSION=-custom > /tmp/kernel.log
cd ..
dpkg -i *.deb