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Tier 2 Linux boot success — 2026-05-18

packages/chip/docs/sim/tier2-boot-success-2026-05-18.md

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Tier 2 Linux boot success — 2026-05-18

Booted Linux 6.6 riscv64 + static busybox 1.36 initramfs on qemu-system-riscv64 -machine virt using QEMU's bundled OpenSBI v1.7, landing in a ~ # shell.

Artifacts

  • Kernel: build/sim/tier2/Image (22 MiB; linux v6.6 make ARCH=riscv defconfig Image)
  • Busybox: build/sim/tier2/busybox (1.7 MiB; busybox 1_36_stable static, SHA1/256 hwaccel disabled to avoid x86-NI assumption)
  • Initramfs: build/sim/tier2/initramfs.cpio.gz (1.2 MiB)
  • Transcript: build/sim/qemu/tier2_linux.log

Repro

sh
# 1. Build kernel + busybox + initramfs inside the riscv64 cross container
make tier2-build       # invokes scripts/build/docker_build_tier2.sh

# 2. Boot to shell with bundled OpenSBI
make tier2-boot        # invokes scripts/sim/run_qemu_tier2_check.py

Boot log excerpt

[    0.961912] Run /init as init process

===============================
eliza tier2: linux booted
===============================
Linux (none) 6.6.0-dirty #1 SMP Tue May 19 02:08:44 UTC 2026 riscv64 GNU/Linux
~ #

Notes

  • macOS arm64 host; Docker Desktop running an amd64 Debian bookworm-slim container with gcc-riscv64-linux-gnu + libc6-dev-riscv64-cross + bzip2.
  • QEMU -bios default uses OpenSBI v1.7 bundled with qemu-system-riscv64 11.0.0 (avoids the bare-elf binutils -pie blocker described in docs/sim/tier1-opensbi-macos-blocker.md).
  • Address map is QEMU virt's default (UART 0x10000000). The follow-up Renode step (sim/renode/eliza_e1.repl) rebinds to our platform contract addresses (UART 0x10001000, CLINT 0x02000000, PLIC 0x0C000000).
  • This is the software Tier 2 milestone. The hardware Tier 4 milestone is booting this same Image+initramfs on the Verilator-compiled ElizaRocketConfig Rocket simulator inside our SoC top-level wrapper — blocked on Linux x86_64 build host for Chipyard (see docs/sim/verilator-rocket-bootstrap-status.md).