fix: swanstation opens its region bios by name

The region BIOS option names scph5500/5501/5502.bin by default and LoadImageFromFile checks only the size (host_interface.cpp:124-133, bios.cpp:82-105). The md5 table serves the directory scan and the Fast Boot patch. validation: [size], found_by: name. Closes the open swanstation finding.

emulators/swanstation.yml

@@ -23,7 +23,11 @@ notes: |
   (dep/openbios) boots instead.
   ref: src/core/system.cpp:650,678-682
 
-  Auto-detects BIOS by scanning system_dir for files of known sizes.
+  The BIOS option of the console region names a file, scph5500.bin,
+  scph5501.bin and scph5502.bin by default, opened by that name with a size
+  check only. When it is missing or of another size the core scans system_dir
+  for files of known sizes and keeps one whose md5 the table knows.
+  ref: src/core/host_interface.cpp:100-133, src/libretro/libretro_core_options.h:96-137
   ref: src/core/host_interface.cpp:136-194 (FindBIOSImageInDirectory)
   Accepts PS1 (512 KB), PS2 (4 MB), and PS3 (0x3E66F0) BIOS images.
   Only the first 512 KB are loaded (src/core/bios.cpp:84, Image(BIOS_SIZE)).
@@ -46,39 +50,46 @@ notes: |
 
 files:
   - name: "scph5500.bin"
+    found_by: "name"
     description: "SCPH-5500 (v3.0 09-09-96 J)"
     region: [japan]
     required: false
     hle_fallback: true
     md5: "8dd7d5296a650fac7319bce665a6a53c"
     size: 524288
-    validation: [size, md5]
-    source_ref: "source src/core/bios.cpp:49"
+    validation: ["size"]
+    source_ref: "source src/core/bios.cpp:49, source src/core/bios.cpp:82-105, source src/core/host_interface.cpp:100-133, source src/libretro/libretro_core_options.h:96-109"
     aliases: []
+    note: "Default of swanstation_BIOS_PathNTSCJ, opened by this name with a size check only (512 KB, 4 MB or the PS3 size). The md5 table identifies files in the directory scan, which runs only when the named file is missing or of another size (host_interface.cpp:136-193). A file whose md5 the table lacks still boots, without the Fast Boot patch (bios.cpp:142-146, system.cpp:689, 711)."
 
   - name: "scph5501.bin"
+    found_by: "name"
     description: "SCPH-5501, 5503, 7003 (v3.0 11-18-96 A)"
     region: [north-america, latin-america]
     required: false
     hle_fallback: true
     md5: "490f666e1afb15b7362b406ed1cea246"
     size: 524288
-    validation: [size, md5]
-    source_ref: "source src/core/bios.cpp:50-51"
+    validation: ["size"]
+    source_ref: "source src/core/bios.cpp:50-51, source src/core/bios.cpp:82-105, source src/core/host_interface.cpp:100-133, source src/libretro/libretro_core_options.h:110-123"
     aliases: []
     evidence:
       hle_fallback: ["2026-10-27-ba53cd101c61", "2026-10-27-f9363c9e87f6"]
+      validation: ["2026-10-27-f9363c9e87f6", "2026-10-27-97e674b2e56e"]
+    note: "Default of swanstation_BIOS_PathNTSCU, opened by this name with a size check only (512 KB, 4 MB or the PS3 size). The md5 table identifies files in the directory scan, which runs only when the named file is missing or of another size (host_interface.cpp:136-193). A file whose md5 the table lacks still boots, without the Fast Boot patch (bios.cpp:142-146, system.cpp:689, 711)."
 
   - name: "scph5502.bin"
+    found_by: "name"
     description: "SCPH-5502, 5552 (v3.0 01-06-97 E)"
     region: [europe, oceania]
     required: false
     hle_fallback: true
     md5: "32736f17079d0b2b7024407c39bd3050"
     size: 524288
-    validation: [size, md5]
-    source_ref: "source src/core/bios.cpp:52-53"
+    validation: ["size"]
+    source_ref: "source src/core/bios.cpp:52-53, source src/core/bios.cpp:82-105, source src/core/host_interface.cpp:100-133, source src/libretro/libretro_core_options.h:124-137"
     aliases: []
+    note: "Default of swanstation_BIOS_PathPAL, opened by this name with a size check only (512 KB, 4 MB or the PS3 size). The md5 table identifies files in the directory scan, which runs only when the named file is missing or of another size (host_interface.cpp:136-193). A file whose md5 the table lacks still boots, without the Fast Boot patch (bios.cpp:142-146, system.cpp:689, 711)."
 
   - name: "psxonpsp660.bin"
     description: "PSP, SCPH-1000R (v4.5 05-25-00 J)"