NooDS - RetroBIOS

Type	libretro
Classification	Community forks
Source	https://github.com/jonian/libretro-noods
Upstream	https://github.com/Hydr8gon/NooDS
Version	Git
Profiled	2026-03-24
Cores	noods
Systems	nintendo-ds, nintendo-gba

Technical notes

Full HLE BIOS for ARM9, ARM7 and GBA SWI routines (hle_bios.cpp:24-60). All BIOS files optional when direct boot is enabled (default). When missing, HLE handler activated via special opcode at offset 3 (memory.cpp:139-168). Firmware auto-generated (128KB non-bootable) if not provided, with default WiFi config, touch calibration and user settings (spi.cpp:90-160). Native BIOS+firmware required only for firmware boot (non-direct-boot mode). Bootable firmware threshold: >128KB (spi.cpp:87). DLDI patching provides SD card access for homebrew via nds_sd_card.bin (dldi.cpp:29-77). File loading code identical between upstream and libretro port.

5 files | 0 required, 5 optional | 5 in repo, 0 missing | 4 with HLE fallback

bios9.bin optional in repo HLE fallback
ARM9 BIOS

• System: nintendo-ds
• Size: 4.0 KB
• Source: src/memory.cpp:130-141
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, rocknix, romm
• HLE fallback for all SWI calls; native needed for firmware boot and logo verification (copyBiosLogo)

bios7.bin optional in repo HLE fallback
ARM7 BIOS

• System: nintendo-ds
• Size: 16.0 KB
• Source: src/memory.cpp:144-155
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, rocknix, romm
• HLE fallback for all SWI calls; native needed for firmware boot

firmware.bin optional in repo HLE fallback
NDS firmware image

• System: nintendo-ds
• Source: src/spi.cpp:62-160
• Platforms: batocera, emudeck, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, rocknix, romm
• Auto-generated 128KB non-bootable firmware as fallback; native dump (>128KB) needed for firmware boot

gba_bios.bin optional in repo HLE fallback
GBA BIOS

• System: nintendo-gba
• Size: 16.0 KB
• Source: src/memory.cpp:158-168, src/core.cpp:252-256
• Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, rocknix, romm
• HLE fallback via swiTableGba; native BIOS disables HLE and enables real GBA boot

nds_sd_card.bin optional in repo
DLDI SD card image for homebrew

• System: nintendo-ds
• Source: src/dldi.cpp:80-83, src/libretro/libretro.cpp:324
• Opened on DLDI startup() call from homebrew ROMs; user-created FAT image

Generated on 2026-09-14T09:03:10Z