docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections

Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.

02_boot_sequence/kickstart_init.md

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+[← Home](../README.md) · [Boot Sequence](README.md)
+
+# Kickstart Initialisation — ROM Scan, ExecBase, Resident Modules
+
+## Overview
+
+After hardware init, the Kickstart ROM creates `ExecBase` and scans for **resident modules** — the OS components compiled into ROM. This process builds the entire OS kernel from tagged structures embedded in the ROM image.
+
+---
+
+## ExecBase Creation
+
+1. Allocate ExecBase structure at a known address (end of Chip RAM)
+2. Initialise memory lists, library list, device list, resource list
+3. Store ExecBase pointer at **address `$000004`** — the global `SysBase`
+4. Initialise the Supervisor stack, interrupt vectors, trap vectors
+
+```
+After this step:
+  *(ULONG *)4 == ExecBase pointer
+  SysBase->LibNode.lib_Version == Kickstart version
+```
+
+---
+
+## Resident Module Scan
+
+The ROM scanner searches for **RomTag** markers (`$4AFC`) throughout the ROM address range:
+
+```c
+struct Resident {
+    UWORD rt_MatchWord;     /* $4AFC — magic marker */
+    struct Resident *rt_MatchTag; /* pointer to self (verification) */
+    APTR  rt_EndSkip;       /* skip past this address */
+    UBYTE rt_Flags;         /* RTF_COLDSTART, RTF_SINGLETASK, etc. */
+    UBYTE rt_Version;       /* version number */
+    UBYTE rt_Type;          /* NT_LIBRARY, NT_DEVICE, NT_RESOURCE */
+    BYTE  rt_Pri;           /* init priority (higher = earlier) */
+    char *rt_Name;          /* module name */
+    char *rt_IdString;      /* version string */
+    APTR  rt_Init;          /* init function or auto-init table */
+};
+```
+
+### Scan Algorithm
+
+```
+for addr in ROM_START to ROM_END step 2:
+    if *(UWORD *)addr == $4AFC:
+        tag = (struct Resident *)addr
+        if tag->rt_MatchTag == tag:  /* self-pointer validates */
+            add to resident list
+            addr = tag->rt_EndSkip  /* skip past module */
+```
+
+---
+
+## Initialisation Phases
+
+Residents are initialised in **priority order** within each phase:
+
+### Phase 1: RTF_COLDSTART (flags bit 0)
+
+Called during cold boot, single-tasking (no scheduler yet):
+
+| Priority | Module | Description |
+|---|---|---|
+| 126 | `exec.library` | Core kernel |
+| 120 | `expansion.library` | AutoConfig Zorro boards |
+| 105 | `68040.library` | CPU trap handlers (if present) |
+| 100 | `utility.library` | Tag/hook support |
+| 70 | `graphics.library` | Display init |
+| 50 | `layers.library` | Clipping layers |
+| 50 | `intuition.library` | GUI subsystem |
+| 40 | `timer.device` | Timing services |
+| 30 | `keyboard.device` | Keyboard |
+| 20 | `input.device` | Input event merging |
+| 10 | `trackdisk.device` | Floppy |
+| −50 | `dos.library` | AmigaDOS file system |
+| −120 | `ramlib` | Disk-based library/device loader |
+
+### Phase 2: RTF_SINGLETASK
+
+Runs after all COLDSTART modules but before multitasking begins. Used by strap (bootstrap) module.
+
+### Phase 3: RTF_AFTERDOS
+
+Runs after DOS is available. External disk-based modules.
+
+---
+
+## After Resident Init
+
+1. Multitasking enabled (scheduler starts)
+2. `dos.library` creates initial CLI process
+3. Boot task launches `strap` → reads boot block from DF0: or boot device
+4. Control passes to `startup-sequence`
+
+---
+
+## References
+
+- NDK39: `exec/resident.h`
+- RKRM: Resident modules chapter