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Resources

These are the files to run gem5 in full system mode. Including the linux kernel, arm bootloader, and root filesystem.

We can use buildroot to create rootfs.ext2 filesystems and load applications into gem5.

Follow these instructions to do so:

Step 1: Download buildroot source

git clone https://github.com/buildroot/buildroot.git
make ARCH=aarch64 BR2_JLEVEL=$(nproc) CROSS_COMPILE=aarch64-linux-gnu- \
    -C buildroot/ arm_foundationv8_defconfig

Step 2: Configure buildroot

Buildroot uses the menuconfig system to graphically select desired parameters. make ARCH=aarch64 BR2_JLEVEL=$(nproc) CROSS_COMPILE=aarch64-linux-gnu-
-C buildroot/ menuconfig

Our default parameters are:

  • Target Options
    • Target Architecture -> AArch64 (little endian)
    • Target Architecture Variant -> Cortex-A57
  • Toolchain
    • Kernel Headers -> Linux 5.4.x
  • Kernel -> Disabled
  • Target packages
    • BusyBox configuration file to use?
      • package/busybox/busybox-minimal.config
  • Filesystem Images
    • enable ext2

Step 3: Build the diskimage

This step will take a few minutes.

make ARCH=aarch64 BR2_JLEVEL=$(nproc) CROSS_COMPILE=aarch64-linux-gnu- \
    -C buildroot/

Step 4: Add gem5 simtools to the disk

You can skip this step if you have built the disk image before.

We need to add the m5 binary to enable gem5 magic commands. cp -r simtools/m5 <buildroot_dir>/output/target/sbin

Then we add the S98 script to enable run script on startup. cp -r simtools/S98 <buildroot_dir>/output/target/etc/init.d

Lastly, replace the inittab file with ours to ensure S98 is run. cp -r simtools/inittab <buildroot_dir>/output/target/etc

Step 5: Add any applications to run in gem5

The buildroot overlay system allows for files to be placed in the disk image. In the directory: <buildroot_dir>/output/target/ The linux file system is mimicked.

Step 6: Rebuild the diskimage and copy rootfs.ext2 to the resources directory

This step will take a few seconds this time.

cd <buildroot_dir>
make ARCH=aarch64 BR2_JLEVEL=$(nproc) CROSS_COMPILE=aarch64-linux-gnu-
mv output/images/rootfs.ext2 ../resources/