BFE EngineeringandClaude Fable 5
bf3c93cf85
The third simulator (deliberately not named "sim"): a QEMU -M virt VM that boots the real 6.18.46 kernel and enters at -kernel zImage — everything below (BootROM/idblock/U-Boot/real BCB A/B selection) is closed blobs + mask ROM and is explicitly out of scope. - qemu/mkinitramfs.sh: pinned static busybox (sha256 fail-closed) + rootfs/ - qemu/mkimage.sh: unprivileged sparse disk image with the device's canonical 12-partition blkdevparts A/B layout (vda == mmcblk0 mapping) - qemu/rootfs/: stage-1 init (by-name symlinks from PARTNAME uevents, whole-token warden.slot= parse, switch_root) + stage-2 init (userdata/oem mounts, slirp networking, payload daemon start) - qemu/run.sh: runner with --slot/--rtc/--watchdog/--rs485/--qmp/--display - qemu/configs/virt.fragment + WARDEN_KCONFIG_FRAGMENT hook in build/build-kernel.sh (canonical RV1106 build untouched when unset): adds PCI, pci-serial, i6300esb watchdog, WireGuard, virtio-gpu/input - qemu/tests/boot-smoke.sh: sentinel-asserting boot test Verified on QEMU 10.0.11: canonical zImage boots -M virt unmodified (the feared DEBUG_UNCOMPRESS decompressor hang does not exist in 6.18); full stack boots both slots; 12 by-name symlinks; userdata persists across reboot; -rtc base=2021-01-01 reproduces the no-RTC wrong-clock class. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018HUayid7W5w7jBdb9Rrj1K
81 lines
2.7 KiB
Plaintext
Executable File
81 lines
2.7 KiB
Plaintext
Executable File
#!/bin/busybox sh
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# Stage-2 init: PID 1 on the disk rootfs (rootfs_a or rootfs_b), reached via
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# switch_root from the initramfs. Brings up the minimum a WardenOS userspace
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# needs — mounts, by-name symlinks, network, serial alias — then starts any
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# payload daemons and holds. This stands in for the device's BusyBox SysV
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# /etc/init.d/S* sequence; it is deliberately tiny, not a model of it.
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/bin/busybox mount -t devtmpfs devtmpfs /dev 2>/dev/null
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exec </dev/console >/dev/console 2>&1
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/bin/busybox --install -s /bin
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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mount -t tmpfs tmpfs /tmp
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# Fresh devtmpfs — repopulate the by-name contract (slotctl.rs depends on it).
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mkdir -p /dev/block/by-name
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for uev in /sys/class/block/vda*/uevent; do
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[ -f "$uev" ] || continue
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partname=""
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devname=""
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while IFS='=' read -r k v; do
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case "$k" in
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PARTNAME) partname="$v" ;;
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DEVNAME) devname="$v" ;;
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esac
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done < "$uev"
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[ -n "$partname" ] && [ -n "$devname" ] \
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&& ln -sf "/dev/$devname" "/dev/block/by-name/$partname"
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done
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# Slot (whole-token parse, same rule as stage 1).
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slot="_a"
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for tok in $(cat /proc/cmdline); do
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case "$tok" in
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warden.slot=*) slot="${tok#warden.slot=}" ;;
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esac
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done
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# The device's matched mounts: persistent state and the slot's oem partition.
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mount -t ext4 /dev/block/by-name/userdata /userdata || echo "init: userdata mount failed"
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mount -t ext4 "/dev/block/by-name/oem${slot}" /oem || echo "init: oem${slot} mount failed"
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mkdir -p /userdata/warden
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# RS485: warden-modbus hardcodes /dev/ttyS4 at compile time; alias it to the
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# VM's pci-serial UART when one is present (needs the virt.fragment kernel).
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[ -c /dev/ttyS0 ] && ln -sf /dev/ttyS0 /dev/ttyS4
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# Network: slirp user-mode net on eth0 (DHCP, fallback to QEMU's static map).
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ip link set lo up
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if [ -e /sys/class/net/eth0 ]; then
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ip link set eth0 up
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if ! udhcpc -i eth0 -n -q -t 5 -T 2 >/dev/null 2>&1; then
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ip addr add 10.0.2.15/24 dev eth0 2>/dev/null
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ip route replace default via 10.0.2.2 dev eth0
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echo "nameserver 10.0.2.3" > /etc/resolv.conf
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fi
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fi
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hostname warden-qemu
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echo "WARDEN-QEMU-ROOTFS-OK slot=${slot}"
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# Payload daemons (dropped into /usr/bin by qemu/mkimage.sh from qemu/payload/).
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for d in /usr/bin/warden-flared /usr/bin/warden-modbus; do
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if [ -x "$d" ]; then
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name="$(basename "$d")"
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echo "init: starting $name"
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"$d" > "/tmp/${name}.log" 2>&1 &
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fi
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done
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if grep -qw warden.shell /proc/cmdline; then
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echo "warden.shell: interactive shell (exit powers off)"
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setsid cttyhack sh
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poweroff -f
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fi
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# Hold: daemons run, console idles, scenarios drive the VM from outside.
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while :; do sleep 3600; done
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