opencode.energia.arti.ee
64cde36a69
Preserve the four MAME indy_4610 ROM images alongside the existing SHA-1 manifest and analysis. The zip and generated ELF wrapper remain ignored.
105 lines
3.7 KiB
Markdown
105 lines
3.7 KiB
Markdown
# sgi-indy
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Research workspace for the Silicon Graphics Indy (IP24) workstation, focused on
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its boot PROM.
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The repository contains:
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- a reproducible fetcher and checksum manifest for the four MAME `indy_4610`
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PROM dumps;
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- a tool that wraps a raw PROM dump in a minimal ELF32 big-endian MIPS image so
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it can be opened by Ghidra/REA at its real address;
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- a structural map of the newest PROM, `ip24prom.070-9101-011.bin`
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(SGI Version 5.3 Rev B10, 12 Feb 1996);
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- the full 1,074-entry function index produced by Ghidra auto-analysis;
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- notes for reproducing the REA + Ghidra setup.
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## Result at a glance
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| Item | Value |
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| --- | --- |
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| Newest Indy PROM | `ip24prom.070-9101-011.bin`, 524,288 bytes |
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| Version string | `SGI Version 5.3 Rev B10 R4X00/R5000 IP24 Feb 12, 1996` |
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| SHA-1 | `ac663a4db68528e400487e98cbf901f620fb30ce` (matches MAME) |
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| SHA-256 | `333a0b2e39bb828a28a758b6f633ae7290030129dc747297a1be68dc317b86ae` |
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| Load address | `0x1FC00000` (BIOS window) |
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| Analyzed code span | `0x1FC00000` - `0x1FC4A8A0`, 1,074 functions |
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| Defined strings | 1,418, from `0x1FC01B7C` to `0x1FC7C16B` |
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| Used bytes | `0x00000` - `0x7F9FF`; remainder is `0xFF` padding |
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See [docs/rom-map.md](docs/rom-map.md) for the memory map, exception-vector
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table, boot flow and function anchors.
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See [docs/rom-map.json](docs/rom-map.json) for the machine-readable layout and
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[docs/procedure-index.csv](docs/procedure-index.csv) for every function start.
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## ROM files
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The four PROM dumps from the MAME 0.236 `indy_4610` set are committed under
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`roms/` for preservation, together with `roms/SHA1SUMS`. The MAME zip and the
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generated ELF wrapper stay ignored.
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The dumps can be re-fetched and verified with:
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```bash
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./tools/fetch-roms.sh
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```
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The fetch script downloads the `indy_4610` set and checks every SHA-1 against
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MAME's `src/mame/sgi/indy_indigo2.cpp`.
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## Reproduce the analysis
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Prerequisites: Node.js 22.23.4+, REA (`npm install -g rea-agents`), Ghidra 12.1.x
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and JDK 21. This workspace used REA 6.8.0, Ghidra 12.1.2 and OpenJDK 21.
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```bash
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export GHIDRA_INSTALL_DIR=/opt/ghidra
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export JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64
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./tools/fetch-roms.sh
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./tools/make-elf-wrapper.py \
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roms/ip24prom.070-9101-011.bin -o roms/indy-ip24-5.3-b10.elf
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rea analyze roms/indy-ip24-5.3-b10.elf --provider ghidra --json
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```
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REA's headerless `raw-binary` lane does not include MIPS. The wrapper declares
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ELF32, big-endian, `ET_EXEC`, `e_flags = EF_MIPS_ARCH_32` and no ABI-flags
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record, which selects REA's recordless MIPS admission and pins Ghidra to
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`MIPS:BE:32:default`. The ROM bytes are copied unchanged at file offset `0x1000`
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and mapped at `0x1FC00000`.
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To regenerate the checked-in map and function index, open the wrapper in a REA
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session, export its evidence bundle, then run:
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```bash
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./tools/rom-map.py roms/ip24prom.070-9101-011.bin \
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--evidence evidence/rea-bundle.json \
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--output docs/rom-map.json \
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--procedures-csv docs/procedure-index.csv
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```
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## Repository layout
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```
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docs/ map, setup notes, generated map JSON and function index
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roms/ fetched ROMs (ignored) and the SHA-1 manifest
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tools/ fetch, ELF wrapper, map generator
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evidence/ local REA bundle (ignored)
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```
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## Setup notes
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The Gitea remote is
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<https://git.wut.ee/opencode.energia.arti.ee/sgi-indy>.
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See [docs/rea-setup.md](docs/rea-setup.md) for the exact REA/OpenCode
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configuration used here.
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## Sources and attribution
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- MAME `indy_indigo2.cpp` for the IP22/IP24 memory map and ROM identities:
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<https://github.com/mamedev/mame/blob/master/src/mame/sgi/indy_indigo2.cpp>
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- MAME 0.236 ROM set archive used for the dumps.
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- MiSTer `SGIIndy_MiSTer` ROM directory used as a cross-check.
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- REA: <https://github.com/morluto/rea>
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