Ah, nevermind, I had forgotten this, the dtbs are tracked inside the gem5 tree:
https://github.com/gem5/gem5/blob/a66fe6a8c36c9ab49cb3a35065bfc645d51036c8/system/arm/dt/armv8.dts an built with: make -C system/arm/dt The Makefile uses the cpp preprocessor to generate the dtbs with different core counts: https://github.com/gem5/gem5/blob/a66fe6a8c36c9ab49cb3a35065bfc645d51036c8/system/arm/dt/Makefile#L48 So hacking up that Makefile is another good option to get your dtbs. On Tue, Mar 6, 2018 at 10:55 AM, Ciro Santilli <ciro.santi...@gmail.com> wrote: > Yes, if you don't modify the dtb, the Linux kernel won't see the > change in the number of CPUs change, this can be verified with cat > /proc/cpuinfo. > > You can modify the dtb directly by first converting it to dts human > readable form: > https://stackoverflow.com/questions/14000736/tool-to-visualize-the-device-tree-file-dtb-used-by-the-linux-kernel/39931834#39931834 > and then doing the inverse operation. > > Normally the original source of the dts for ARM should be present on > the forked gem5 Linux kernel fork: > https://gem5.googlesource.com/arm/linux/+/917e007a4150d26a0aa95e4f5353ba72753669c7/arch/arm/boot/dts/ > but I can't find if easily for some reason, only > vexpress-v2p-ca15-tc1.dts, maybe someone can clarify their origin. > > > On Tue, Mar 6, 2018 at 10:46 AM, 조해윤 <chohy2...@gmail.com> wrote: >> Dear, everyone. >> >> I try to full system simulation for ARM ISA. >> So, I downloaded the pre-compiled kernels and disk images >> (aarch-system-20170616.tar.xz) from the repository >> (http://www.gem5.org/dist/current/arm/). >> >> There are several dtb files like below. >> vexpress-v2p-ca15-tc1-gem5_1cpus.20170616.dtb >> vexpress-v2p-ca15-tc1-gem5_2cpus.20170616.dtb >> vexpress-v2p-ca15-tc1-gem5_4cpus.20170616.dtb >> >> However, not for 8 or 16 cpus. >> If I want to experiment 16-cpu configuration, I should modify the dtb file? >> >> If I should modify the dtb file, how I can do that? >> I found the documentations to build a kernel or to make a disk image. >> http://gem5.org/ARM_Kernel >> http://gem5.org/Ubuntu_Disk_Image_for_ARM_Full_System >> >> But, I couldn't find any documentation to modify the dtb file. >> Is there any documentation for the dtb file? >> >> Best regards, >> Haeyoon Cho. >> >> _______________________________________________ >> gem5-users mailing list >> gem5-users@gem5.org >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users _______________________________________________ gem5-users mailing list gem5-users@gem5.org http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
