AXP Magisk resurrection track: Speckit 009 port AXP/LOS22 to LOS23.

Ship Magisk like GOLDEN; KernelSU optional recycle only; parallel to sunfish-a16-rom standby.

docs/007-debug-boot-panic-screen.md

@@ -0,0 +1,60 @@
+# Debug boot — freeze on panic (photo / dump)
+
+Normal sunfish kernel: `CONFIG_PANIC_TIMEOUT=5` + often
+`CONFIG_QCOM_FORCE_WDOG_BITE_ON_PANIC` → reboot in seconds. Console is
+**UART only** (`console=ttyMSM0`); `# CONFIG_VT is not set` → **no Oops text
+on the phone display** (you only see the Google logo loop).
+
+## What a “debug boot” must include (owner)
+
+For a useful photo, **both** are required — freeze alone is not enough:
+
+1. **Freeze:** `CONFIG_PANIC_TIMEOUT=0` + cmdline `panic=0`; disable
+   `CONFIG_QCOM_FORCE_WDOG_BITE_ON_PANIC` so it does not reboot in 5s.
+2. **On-screen console:** `CONFIG_VT` + `CONFIG_FRAMEBUFFER_CONSOLE` (+
+   `console=tty0` in cmdline). Without this, you only see the Google logo.
+
+| Goal | Mechanism | Photo-able? |
+|------|-----------|-------------|
+| Stop reboot loop | `panic=0` / `PANIC_TIMEOUT=0`, no wdog-bite-on-panic | Logo freezes only |
+| Oops on screen | VT + FRAMEBUFFER_CONSOLE + `console=tty0` | Yes if panic after FB; early may still be logo |
+| Dump after hang | Freeze + penúltimo + immediate `klog`/`logfs` dd | Not a photo |
+
+Use **only on LAB**, SusFS/debug trials. Never ship as daily boot.
+Next SusFS debug build after the sigfix trial must enable **both**.
+
+## Host recipe (LAB SusFS debug boot)
+
+1. Defconfig fragment (or temporary edits) on `rom-dev01`:
+
+```text
+CONFIG_PANIC_TIMEOUT=0
+# CONFIG_QCOM_FORCE_WDOG_BITE_ON_PANIC is not set
+# optional on-screen console (experimental on Pixel 4.14):
+CONFIG_VT=y
+CONFIG_VT_CONSOLE=y
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
+```
+
+2. Cmdline (device tree or unpack/repack boot): add `panic=0` and optionally
+   `console=tty0`. Prefer a **vendor_sunfish / BoardConfig** override gated by
+   a make var (e.g. `SUNFISH_KERNEL_PANIC_DEBUG=1`) so normal bacon stays clean.
+
+3. Build `bootimage`, name artifact
+   `boot-resukisu-susfs-DEBUG-YYYYMMDDTHHMMSSZ.img`.
+
+4. Flash only to `boot_b`; keep penúltimo on `boot_a`. On hang: photo if text
+   appears; Vol−+Power → `--set-active=a`.
+
+## Capture order (always)
+
+1. Panic / hang on SusFS (debug) slot  
+2. Fastboot **before** Android success on good slot  
+3. Then penúltimo + immediate `dd` of `klog`/`logfs` (4a has no `fastboot fetch`)
+
+## Status
+
+Documented 2026-09-16 after SusFS early `kernel_panic` with empty Oops in klog.
+Sigfix rebuild may already address root cause; keep this recipe for the next
+opaque bootloop.