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docs: describe detection as the installer does it

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Abdessamad Derraz committed 2026-10-18 15:08:25 +02:00
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wiki/installer.md
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@@ -258,7 +258,6 @@ wins, since a machine is only one of them.
| Evidence | Platform | BIOS directory |
|----------|----------|----------------|
| `/etc/os-release` `ID=rocknix` | ROCKNIX | `/storage/roms/bios` |
| `/media/fat/MiSTer` | MiSTer FPGA | `/media/fat/games` |
| `/etc/knulli-release` | Batocera | `/userdata/bios` |
| `/etc/os-release` `ID=lakka` | Lakka | `/storage/system` |
| `/etc/batocera-version` | Batocera | `/userdata/bios` |
@@ -267,6 +266,24 @@ wins, since a machine is only one of them.
| `/home/ark` and `/opt/system` | RetroArch | `/roms/bios` |
| `/mnt/vendor/bin/dmenu.bin` | RetroArch | `/mnt/mmc/bios` |
Batocera, Recalbox and ROCKNIX also name the board they were built for, and
that board narrows the install unless `--target` or `--every-board` says
otherwise (see the options above).
Some platforms keep their BIOS in a fixed directory, and that directory is the
evidence. They are looked for after the configurations below, for a platform
not already found that way.
| Evidence | Platform | BIOS directory |
|----------|----------|----------------|
| `/media/fat/MiSTer` | MiSTer FPGA | `/media/fat/games` |
| `C:\RetroBat\bios` or `%USERPROFILE%\RetroBat\bios` | RetroBat | the same |
| `~/Emulation/bios` | EmuDeck | the same |
| `~/.var/app/net.retrodeck.retrodeck` | RetroDECK | `~/retrodeck` |
| `/romm/library/bios` | RomM | the same |
| `~/RetroPie/BIOS` | RetroPie | the same |
| `%USERPROFILE%\BizHawk\Firmware` or `~/.config/BizHawk/Firmware` | BizHawk | the same |
Desktop installs are read from their own configuration, and several can be
found on one machine.
@@ -309,13 +326,15 @@ they reference emulators rather than owning a BIOS directory. ES-DE is looked
up at `$ESDE_APPDATA_DIR` or `~/ES-DE`, the two locations its own
`getAppDataDirectory` resolves.
BizHawk, RetroBat, RomM and RetroPie have no detection and are selected with
`--platform`. When a forced platform is not found on the machine, the
destination falls back to `/userdata/bios` for Batocera, `/recalbox/share/bios`
for Recalbox, `/storage/system` for Lakka, `~/retrodeck` for RetroDECK,
`~/Emulation/bios` for EmuDeck, `/storage/roms/bios` for ROCKNIX,
`/media/fat/games` for MiSTer, `~/RetroPie/BIOS` for RetroPie, and `~/bios`
for anything else. On Android a forced `--platform retroarch` falls back to
When a platform named with `--platform` is not found on the machine, the
destination falls back to the directory its detection looks for:
`/userdata/bios` for Batocera, `/recalbox/share/bios` for Recalbox,
`/storage/system` for Lakka, `~/retrodeck` for RetroDECK, `~/Emulation/bios`
for EmuDeck, `/storage/roms/bios` for ROCKNIX, `/media/fat/games` for MiSTer,
`~/RetroPie/BIOS` for RetroPie, `/romm/library/bios` for RomM,
`C:\RetroBat\bios` for RetroBat, `%USERPROFILE%\BizHawk\Firmware` (Windows)
or `~/.config/BizHawk/Firmware` for BizHawk, and RetroArch's own default
system directory for RetroArch. On Android a forced `--platform retroarch` falls back to
`<shared storage>/RetroArch/system` instead, a home directory there belonging
to Termux rather than to the frontend. Pass `--dest` to say where instead of
relying on that.