fix: dev9 files load from the working directory

DEV9 opens eeprom.dat and flash.dat by bare name (pcsx2/DEV9/DEV9.cpp:144
at f0523f8a, AetherSX2 DEV9/flash.cpp:89, PCSX2 1.6 dev9ghzdrk/flash.cpp:73),
so the process working directory answers, never the BIOS folder. Only
yaps2 said so: the other PCSX2 profiles had the file packed into the BIOS
folder and the RetroDECK export add it there.

emulators/aethersx2.yml

@@ -149,6 +149,7 @@ files:
     source_ref: "source aethersx2/pcsx2/CDVD/CDVD.cpp:120-144, aethersx2 v1.5-3606 usr/share/aethersx2 0x95e7fc"
 
   - name: eeprom.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     size: 64
@@ -157,6 +158,7 @@ files:
     source_ref: "source aethersx2/pcsx2/DEV9/DEV9.cpp:146-161, aethersx2 v1.5-3606 usr/share/aethersx2 0x97ac90"
 
   - name: flash.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     max_size: 8650752

emulators/armsx2.yml

@@ -287,6 +287,7 @@ files:
     source_ref: "source pcsx2/CDVD/CDVD.cpp:63-64, source pcsx2/CDVD/CDVD.cpp:207-220"
 
   - name: eeprom.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     size: 64
@@ -298,6 +299,7 @@ files:
     source_ref: "source pcsx2/DEV9/DEV9.cpp:78, source pcsx2/DEV9/DEV9.cpp:225-276"
 
   - name: flash.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     max_size: 8650752

emulators/emucorex.yml

@@ -257,6 +257,7 @@ files:
     source_ref: "source app/src/main/cpp/pcsx2/pcsx2/CDVD/CDVD.cpp:50-51, source app/src/main/cpp/pcsx2/pcsx2/CDVD/CDVD.cpp:195-208"
 
   - name: eeprom.dat
+    load_from: working_directory
     system: sony-playstation-2
     required: false
     hle_fallback: true
@@ -269,6 +270,7 @@ files:
     source_ref: "source app/src/main/cpp/pcsx2/pcsx2/DEV9/DEV9.cpp:104-167"
 
   - name: flash.dat
+    load_from: working_directory
     system: sony-playstation-2
     required: false
     hle_fallback: true

emulators/nethersx2-turnip-classic.yml

@@ -231,6 +231,7 @@ files:
     source_ref: "upstream aethersx2/pcsx2/CDVD/CDVD.cpp:120-144, nethersx2-turnip-classic v0.7 libemucore.so 0x791700-0x7918f4"
 
   - name: eeprom.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     size: 64
@@ -242,6 +243,7 @@ files:
     source_ref: "upstream aethersx2/pcsx2/DEV9/DEV9.cpp:73, upstream aethersx2/pcsx2/DEV9/DEV9.cpp:145-160, nethersx2-turnip-classic v0.7 libemucore.so 0x7bb620-0x7bb680"
 
   - name: flash.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     max_size: 8650752

emulators/nethersx2-turnip.yml

@@ -212,6 +212,7 @@ files:
     source_ref: "upstream aethersx2/pcsx2/CDVD/CDVD.cpp:120-144, nethersx2-turnip v0.7 libemucore.so 0x79cbd0-0x79cc20"
 
   - name: eeprom.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     size: 64
@@ -223,6 +224,7 @@ files:
     source_ref: "upstream aethersx2/pcsx2/DEV9/DEV9.cpp:146-161, nethersx2-turnip v0.7 libemucore.so 0x7c5c44"
 
   - name: flash.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     max_size: 8650752

emulators/nethersx2.yml

@@ -195,6 +195,7 @@ files:
     source_ref: "upstream aethersx2/pcsx2/CDVD/CDVD.cpp:120-144, nethersx2 v2.2n-4248 libemucore.so 0x79cbc0-0x79cdc4"
 
   - name: eeprom.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     size: 64
@@ -206,6 +207,7 @@ files:
     source_ref: "upstream aethersx2/pcsx2/DEV9/DEV9.cpp:146-161, nethersx2 v2.2n-4248 libemucore.so 0x7c5c40-0x7c5ca0"
 
   - name: flash.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     max_size: 8650752

emulators/pcee2.yml

@@ -160,6 +160,7 @@ files:
       failure to open is reported once on screen.
 
   - name: "eeprom.dat"
+    load_from: working_directory
     description: "DEV9 network adapter EEPROM"
     size: 64
     required: false

emulators/pcsx2-legacy.yml

@@ -127,6 +127,7 @@ files:
     source_ref: "pcsx2/CDVD/CDVD.cpp:93-122"
 
   - name: eeprom.dat
+    load_from: working_directory
     system: sony-playstation-2
     required: false
     hle_fallback: true
@@ -136,6 +137,7 @@ files:
     source_ref: "plugins/dev9ghzdrk/DEV9.cpp:176-227, plugins/dev9ghzdrk/DEV9.cpp:71-81"
 
   - name: flash.dat
+    load_from: working_directory
     system: sony-playstation-2
     required: false
     hle_fallback: true

emulators/pcsx2.yml

@@ -67,6 +67,7 @@ files:
     source_ref: "pcsx2/CDVD/CDVD.cpp:190-204"
 
   - name: eeprom.dat
+    load_from: working_directory
     required: false
     hle_fallback: true
     size: 64

emulators/pcsx2x6.yml

@@ -142,6 +142,7 @@ files:
     source_ref: "source pcsx2/CDVD/CDVD.cpp:51-52, source pcsx2/CDVD/CDVD.cpp:196-209"
 
   - name: eeprom.dat
+    load_from: working_directory
     system: namco-system246
     required: false
     hle_fallback: true
@@ -151,6 +152,7 @@ files:
     source_ref: "source pcsx2/DEV9/DEV9.cpp:67-77, source pcsx2/DEV9/DEV9.cpp:116-167"
 
   - name: flash.dat
+    load_from: working_directory
     system: namco-system246
     required: false
     hle_fallback: true

tests/test_audit_regressions.py

@@ -6904,5 +6904,25 @@ class Ps2BiosImagesAreFoundByContent(unittest.TestCase):
         self.assertEqual(named, [])
 
 
+class Dev9FilesAreReadFromTheWorkingDirectory(unittest.TestCase):
+    """DEV9 opens eeprom.dat and flash.dat by bare name (PCSX2
+    pcsx2/DEV9/DEV9.cpp:144, AetherSX2 DEV9/flash.cpp:89): the working
+    directory, never the BIOS folder. Eight profiles left load_from unset,
+    so the file was packed into the BIOS folder, where nothing reads it."""
+
+    def test_every_dev9_file_names_the_working_directory(self):
+        import yaml
+
+        unset = []
+        for path in sorted((ROOT / "emulators").glob("*.yml")):
+            profile = yaml.safe_load(path.read_text(encoding="utf-8")) or {}
+            for entry in profile.get("files") or []:
+                if entry.get("name") in ("eeprom.dat", "flash.dat") and "DEV9" in str(
+                    entry.get("source_ref")
+                ) and entry.get("load_from") != "working_directory":
+                    unset.append(f"{path.stem}: {entry['name']}")
+        self.assertEqual(unset, [])
+
+
 if __name__ == "__main__":
     unittest.main()