gem5

I want to boot the Linux kernel in full system (FS) mode with a lightweight CPU to save time, make a checkpoint after boot finishes, and then restore the checkpoint with a more detailed CPU to study a benchmark, as mentioned at: http://gem5.org/Checkpoints However, when I tried to use -r 1 --restore-with-cpu= I cannot observe cycle differences between the new and old CPU. The measure I'm looking at is how cache sizes affect the number of cycles that a benchmark takes to run. The setup I'm using is described in detail at: Why doesn't the Linux kernel see the cache sizes in the gem5 emulator in

At https://www.mail-archive.com/gem5-users@gem5.org/msg15233.html Jason mentioned the technique of attaching two disk images to restore a checkpoint and run a different benchmark. Is it possible to specify multiple disk images when using fs.py ? From the source code I don't think it is currently supported, but just double checking before I decided to patch it or not. It seems that multiple --disk-image= options just overwrite one another. fs_bigLITTLE.py seems to support it however. gem5 60600f09c25255b3c8f72da7fb49100e2682093a https://www.mail-archive.com/gem5-users@gem5.org/msg15675.html I

I am currently working with Gem5 and I have to access via UART from my Host to ARMv8 bare-metal option, so i tried lots way but i stocked yet. could you please let me know, how can i map my host's Serial port to ARMv8's Serial Port in bare-metal type programming. Any help would be appreciated Working setups This repository contains a highly automated working example . Features: works on both QEMU and gem5 works on both arm and aarch64 newlib allows using the standard C library optionally semihosting exemplified works on both RealViewPBX and VExpress_GEM5_V1 . You should prefer VExpress_GEM5_V1

Since syscall emulation is much easier to setup, I'm wondering what are the advantages of using the full system emulation when running an userland program. Or in other words, what interesting aspects are modeled in the full system but not syscall emulation mode, and when are they significant? It is mentioned in the docs at: http://gem5.org/Splash_benchmarks that full system is Realistic: you're getting the actual Linux thread scheduler to schedule your threads Is this the only advantage, or are there any other advantage for users that are optimizing their applications or investigating micro

Ubuntu 17.10, C program: #include <stdio.h> #include <stdlib.h> int main(void) { puts("hello"); return EXIT_SUCCESS; } gem5 version: da79d6c6cde0fbe5473ce868c9be4771160a003b dec 2017 GCC version: $ sudo apt-get install gcc-arm-linux-gnueabi $ arm-linux-gnueabi-gcc --version arm-linux-gnueabi-gcc (Ubuntu/Linaro 7.2.0-6ubuntu1) 7.2.0 Compile and run: ./gem5/gem5/build/ARM/gem5.opt ./gem5/gem5/configs/example/se.py -c ./a.out arm-linux-gnueabi-gcc -static kernel_module/user/hello.c Outcome: gem5 Simulator System. http://gem5.org gem5 is copyrighted software; use the --copyright option for details