mirror of
https://github.com/Abdess/retroarch_system.git
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Abdessamad Derraz
9c15246d88
nullDC.cpp:182-188 loads both from get_readonly_data_path("/data/"); dc/ was the Recalbox patch.
72 lines
3.2 KiB
YAML
72 lines
3.2 KiB
YAML
emulator: Reicast
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type: standalone
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core_classification: community_fork
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source: "https://github.com/skmp/reicast-emulator"
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upstream: "https://github.com/skmp/reicast-emulator"
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profiled_date: "2026-10-17"
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source_commit: "ad61f95dd6b4c6218846a25de6194550311a5d28"
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pin_frozen: "Recalbox 10.1.1 builds this revision (package/reicast/reicast.mk REICAST_VERSION). Later commits on reicast-emulator are not part of that build."
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core_version: "Git"
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display_name: "Sega - Dreamcast (Reicast)"
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cores:
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- "reicast"
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systems:
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- "sega-dreamcast"
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data_root:
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linux:
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path: "$XDG_DATA_HOME/reicast, else ~/.local/share/reicast"
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source_ref: "core/linux-dist/main.cpp:287-326,396, shell/linux/Makefile:254"
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note: "~/.reicast when that folder exists. The boot ROM and flash are read from its data/ subfolder, which Recalbox replaces with /recalbox/share/bios/dc"
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notes: |
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Dreamcast emulator descended from nullDC. The Linux build is compiled
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for one platform, and the default is dreamcast, which sets the ROM prefix
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dc_, a 2 MB boot ROM, a 128 KB flash and NVR_OPTIONAL 0
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(ref: core/types.h:209-217).
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LoadRomFiles() tries dc_boot.bin, dc_boot.bin.bin, dc_bios.bin and
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dc_bios.bin.bin for the boot ROM, then dc_nvmem.bin, dc_flash_wb.bin,
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dc_flash.bin and dc_flash.bin.bin for the flash
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(ref: core/hw/holly/sb_mem.cpp:30-51). Each candidate is accepted
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when a full chip's worth of bytes can be read from it
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(ref: core/hw/flashrom/flashrom.h:39-49, 61-99). No hash is checked.
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With NVR_OPTIONAL 0 a missing flash fails LoadRomFiles() the same way
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a missing boot ROM does.
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When LoadRomFiles() fails, or the reios setting is on, the core starts
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its HLE BIOS instead and loads only the flash, if present
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(ref: core/nullDC.cpp:183-200, core/hw/holly/sb_mem.cpp:58-64).
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Upstream resolves the directory as <data dir>/data/, the data dir
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being ~/.reicast when it exists, else $XDG_DATA_HOME/reicast or
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~/.local/share/reicast, then each $XDG_DATA_DIRS entry plus /reicast
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(ref: core/nullDC.cpp:182-188, core/stdclass.cpp:83-100,
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core/linux-dist/main.cpp:287-326, 355-379). The paths below are
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relative to that data dir. Recalbox patches nullDC.cpp to read and
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write both files in /recalbox/share/bios/dc/ instead.
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files:
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- name: "dc_boot.bin"
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path: "data/dc_boot.bin"
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aliases: ["dc_boot.bin.bin", "dc_bios.bin", "dc_bios.bin.bin"]
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system: "sega-dreamcast"
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required: false
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hle_fallback: true
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min_size: 2097152
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validation: [size]
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description: "Dreamcast boot ROM"
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source_ref: "core/hw/holly/sb_mem.cpp:20, 30-36, core/types.h:211, 215"
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note: "First of the four names that reads 2097152 bytes wins. Missing, the HLE BIOS runs."
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- name: "dc_nvmem.bin"
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path: "data/dc_nvmem.bin"
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aliases: ["dc_flash_wb.bin", "dc_flash.bin", "dc_flash.bin.bin"]
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system: "sega-dreamcast"
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required: false
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hle_fallback: true
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min_size: 131072
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validation: [size]
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description: "Dreamcast flash memory"
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source_ref: "core/hw/holly/sb_mem.cpp:22-23, 37-48, 58-64, core/types.h:212, 217"
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note: "Tried as dc_nvmem.bin, dc_flash_wb.bin, dc_flash.bin, then dc_flash.bin.bin. Written back as dc_nvmem.bin on exit. Missing, LoadRomFiles() fails even with a boot ROM present and the HLE BIOS runs."
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