DS game only Header
Numeric metadata for this overlay as read from the overlay table at ROM
offset 0x8DE00 (per-entry stride 32 bytes). Function
counts, data-item counts, and the call-graph fan-out are from a Ghidra
11.3.1 headless auto-analysis pass.
Reading the binary
The overlay ships on the cart at file ID 2 under the BLZ code-LZ compression wrapper (the same backward-LZ scheme Nintendo uses for executable ARM9 code).
At load time the engine reads the overlay table entry at ROM offset
0x8DE00 + 2 * 0x20, allocates the destination
RAM region at 0x02155a00, decompresses
the body in-place (if compressed), and resolves any external
relocations.
To inspect this overlay outside the running game, decompress
overlay/overlay_002.bin with
ndspy.codeCompression.decompress() (Python ndspy library)
and load the resulting plaintext into Ghidra or
IDA at base address 0x02155a00. The
raw Ghidra auto-analysis dump used to populate this page lives at
notes/overlay_knowledgebase/raw/ov002.json;
the per-overlay descriptive markdown is at
notes/overlay_knowledgebase/ov002.md.
Embedded strings
No UTF-16 LE strings are embedded directly in this overlay's binary. Any text it displays at runtime comes from a container file loaded via the content cache.
Container references
Distinct container basenames referenced by this overlay. Each is loaded via the content cache by passing the basename string to a lookup that resolves it to a file ID in the ROM's FAT. The path column shows the file's location in the clean extract, where resolved.
-
bbsβdata/bbs.lzs
Function list
Functions Ghidra auto-identified inside this overlay's RAM range.
Names prefixed FUN_ are auto-generated from the function's
entry address; size is in bytes; the "calls" column counts both
intra-overlay branches and external ARM9 call targets. The "strings"
column counts how many UTF-16 LE strings each function references.
Show all 28 functions
| # | Address | Size | Calls | Strings | Role hint |
|---|---|---|---|---|---|
| 1 | 0x02155a54 | 58 | 7 | 0 | code |
| 2 | 0x02155efc | 42 | 5 | 0 | code |
| 3 | 0x02155f28 | 1,052 | 54 | 0 | high-fan-out (likely dispatcher / setup) |
| 4 | 0x0215635c | 44 | 4 | 0 | code |
| 5 | 0x02156390 | 50 | 4 | 0 | code |
| 6 | 0x021563cc | 30 | 2 | 0 | trampoline / small helper |
| 7 | 0x021563f0 | 28 | 2 | 0 | trampoline / small helper |
| 8 | 0x02156414 | 64 | 0 | 0 | code |
| 9 | 0x02156458 | 100 | 4 | 0 | code |
| 10 | 0x021564bc | 56 | 1 | 0 | code |
| 11 | 0x021564f8 | 22 | 1 | 0 | trampoline / small helper |
| 12 | 0x02156514 | 102 | 7 | 0 | code |
| 13 | 0x02156584 | 46 | 5 | 0 | code |
| 14 | 0x021565b8 | 10 | 0 | 0 | trampoline / small helper |
| 15 | 0x021565cc | 10 | 0 | 0 | trampoline / small helper |
| 16 | 0x021565e0 | 26 | 2 | 0 | trampoline / small helper |
| 17 | 0x02156600 | 230 | 10 | 0 | code |
| 18 | 0x021566f4 | 242 | 18 | 0 | code |
| 19 | 0x021567f8 | 154 | 8 | 0 | code |
| 20 | 0x021568a4 | 64 | 5 | 0 | code |
| 21 | 0x021568e4 | 84 | 8 | 0 | code |
| 22 | 0x02156940 | 164 | 9 | 0 | code |
| 23 | 0x021569f4 | 74 | 6 | 0 | code |
| 24 | 0x02156a40 | 252 | 19 | 0 | code |
| 25 | 0x02156b44 | 308 | 10 | 0 | code |
| 26 | 0x02156c80 | 200 | 7 | 0 | code |
| 27 | 0x02156d50 | 82 | 6 | 0 | code |
| 28 | 0x02156dac | 12 | 1 | 0 | trampoline / small helper |
Open questions & conflicts
Open questions / unknowns
- Auto-analysis identified 28 functions covering 3606 of 5184 overlay bytes.
- Function names are auto-generated `FUN_<addr>`. Manual renaming based on call-graph + string-ref analysis is a follow-up.
- BSS size is 0 bytes; Ghidra-imported overlay does not include BSS so any references into the BSS range appear as unresolved.
Conflicts with the prior shallow pass
- No major conflicts detected with prior-pass `overlay_role_final.json` record.
Source
- Per-overlay markdown:
notes/overlay_knowledgebase/ov002.md - Raw Ghidra dump:
notes/overlay_knowledgebase/raw/ov002.json - Overlay-system explainer: overlays system
- Plain-English overlay primer: overlay knowledgebase