Ah, nevermind, I had forgotten this, the dtbs are tracked inside the gem5 tree:


an built with:

make -C system/arm/dt

The Makefile uses the cpp preprocessor to generate the dtbs with
different core counts:

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
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