Hi all, I've been toying with the DVFS example in https://www.gem5.org/documentation/learning_gem5/part2/arm_dvfs_support/ with a v21 distro of GEM5. I got it working despite some small version variations...
This is the command I use to launch the simulation: ./build/ARM/gem5.opt \ ./configs/example/arm/fs_bigLITTLE_DVFS.py \ --cpu-type=atomic \ --big-cpu-clock 2GHz 1GHz 500MHz \ --little-cpu-clock 1GHz 500MHz 250MHz \ --big-cpu-voltage 1.0V 0.5V 0.25V \ --little-cpu-voltage 1.0V 0.5V 0.25V \ --dvfs \ --bootloader=./common/boot.arm64 \ --kernel=./common/kernel_test/vmlinux \ --disk=./common/aarch64-ubuntu-trusty-headless.img \ --bootscript=./common/bash.rcS Where fs_bigLITTLE_DVFS.py was modified following the guide; boot.arm64 and aarch64-ubuntu-trusty-headless.img were obtained from the gem5 guest binaries repo ( https://www.gem5.org/documentation/general_docs/fullsystem/guest_binaries); bash.rcS is a simple command line application; and vmlinux was obtained from https://gem5.googlesource.com/arm/linux and compiled with make ARCH=arm64 CROSS_COMPILE=aarch64-none-elf- gem5_defconfigmake ARCH=arm64 CROSS_COMPILE=aarch64-none-elf- -j $(nproc) However, the latest linux version in googlesource is 4.15 and for different reasons I'm interested in the newer versions of the kernel. So, naturally I obtained the vanilla linux kernel from Linus' repository and compiled it with make ARCH=arm64 CROSS_COMPILE=aarch64-none-elf- defconfigmake ARCH=arm64 CROSS_COMPILE=aarch64-none-elf- -j $(nproc) I've tested the latest version (5.19) and even checked out the v4.14 and v4.15 branches; however, while the simulation works, the cpufreq driver is nowhere to be found. I've also tested using the pre-compiled kernel from the guest binaries (v4.15) and it also works. Finally, I tested building the kernel from the googlesource using different configurations (gem5_defconfig, oldconfig, defconfig) and only defconfig fails to generate the cpufreq drivers. Any ideas as to what I'm missing or some insights on what needs to be changed to defconfig in the vanilla kernels? Best,
_______________________________________________ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
