SG2044: Add kernel.spec of openEuler 24.03

packages/openeuler-24.03/kernel/README.md

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+# How to Build Linux Kernel Related rpm Packages of openEuler 24.03
+
+All commands should execute on RISC-V based machines, and maybe openEuler distribution is required.
+This can't work on x86 machines.
+
+## Prepare Kernel Source
+Rename the directory of linux kernel source to 'kernel'
+```
+mv linux-riscv kernel
+```
+Enter your kernel source tree, and make it clean
+```
+cd kernel
+make distclean
+make mrproper
+```
+And maybe there is 'build' directory in your source code, if you ever build your source code before.
+```
+rm -rf build
+```
+Create a tar ball of this kernel. Don't include git informations.
+```
+cd ../
+tar --exclude=.git -czvf kernel.tar.gz kernel
+```
+
+## Prepare RPM Build Environment
+Install tools.
+```
+sudo yum install -y rpmdevtools
+```
+Install dependencies
+```
+sudo yum-builddep kernel.spec
+```
+Create rpm build tree
+```
+rpmdev-setuptree
+```
+After execute this command, a directory named rpmbuild will be created at your home directory.
+Don't use root privilidge for this command.
+
+Copy kernel tar ball to ~/rpmbuild/SOURCES
+```
+cp kernel.tar.gz ~/rpmbuild/SOURCES/
+```
+Copy spec file to ~/rpmbuild/SPECS. Enter bootloader-riscv/packages/openeuler-24.03/kernel
+```
+cd bootloader-riscv/packages/openeuler-24.03/kernel
+```
+```
+cp kernel.spec ~/rpmbuild/SPECS/
+```
+Copy other source files
+```
+cp cpupower.config cpupower.service ~/rpmbuild/SOURCES/
+```
+Modify kernel.spec as the need of your kernel.
+```
+Modify variable:
+
+%global upstream_version    6.12    /* MUST be the same with your kernel */
+%global upstream_sublevel   8       /* MUST be the same with your kernel */
+%global devel_release       0
+%global maintenance_release .0.0     
+%global pkg_release         .0
+```
+upstream\_version and upstream\_sublevel MUST match the version of your kernel.
+You can execute below command to see your kernel version.
+Enter your kernel source tree
+```
+cd kernel
+make kernelversion
+```
+## Start Building
+Enter ~/rpmbuild directory
+```
+cd ~/rpmbuild
+rpmbuild -bb SPECS/kernel.spec
+```
+root privilidge is not needed and it is not encouraged using sudo anywhere.
+
+## Find RPMs
+You can find RPMs in ~/rpmbuild/RPMS

packages/openeuler-24.03/kernel/cpupower.config

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+# See 'cpupower help' and cpupower(1) for more info
+CPUPOWER_START_OPTS="frequency-set -g performance"
+CPUPOWER_STOP_OPTS="frequency-set -g ondemand"

packages/openeuler-24.03/kernel/cpupower.service

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+[Unit]
+Description=Configure CPU power related settings
+After=syslog.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+EnvironmentFile=/etc/sysconfig/cpupower
+ExecStart=/usr/bin/cpupower $CPUPOWER_START_OPTS
+ExecStop=/usr/bin/cpupower $CPUPOWER_STOP_OPTS
+
+[Install]
+WantedBy=multi-user.target