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
55 lines
1.6 KiB
Plaintext
Executable File
55 lines
1.6 KiB
Plaintext
Executable File
#!/bin/busybox sh
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# Stage-1 rc: sourced by /init (still PID 1, initramfs root) when a virtio
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# disk is present. Emulates U-Boot's slot choice — parse warden.slot= from the
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# cmdline, mount that rootfs, switch_root into it. This is an EMULATION of the
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# A/B selection outcome, not the BCB/bootcount mechanism itself.
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# /dev/block/by-name/<PARTNAME> symlinks: the contract flare-edge slotctl.rs
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# relies on. blkdevparts= gives every vda partition a PARTNAME in sysfs.
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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 select: whole-token parse of warden.slot= (never a substring match).
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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="${tok#warden.slot=}" ;;
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esac
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done
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case "$slot" in
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_a|_b) ;;
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*) echo "rc: bad warden.slot='$slot', falling back to _a"; slot="_a" ;;
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esac
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root="/dev/block/by-name/rootfs${slot}"
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if [ ! -e "$root" ]; then
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echo "rc: $root missing — staying in initramfs"
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return 0
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fi
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mkdir -p /mnt
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if ! mount -t ext4 "$root" /mnt; then
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echo "rc: mount of $root failed — staying in initramfs"
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return 0
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fi
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if [ ! -x /mnt/sbin/init ]; then
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echo "rc: $root has no /sbin/init — staying in initramfs"
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umount /mnt
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return 0
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fi
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echo "rc: switching root to rootfs${slot} ($root)"
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exec switch_root /mnt /sbin/init
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