[NES] Experimental workaround for PSRAM issue.

nesemu-go/components/nofrendo/mappers/map004.c

@@ -3,14 +3,14 @@
 **
 **
 ** This program is free software; you can redistribute it and/or
-** modify it under the terms of version 2 of the GNU Library General 
+** modify it under the terms of version 2 of the GNU Library General
 ** Public License as published by the Free Software Foundation.
 **
-** This program is distributed in the hope that it will be useful, 
+** This program is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
-** Library General Public License for more details.  To obtain a 
-** copy of the GNU Library General Public License, write to the Free 
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+** Library General Public License for more details.  To obtain a
+** copy of the GNU Library General Public License, write to the Free
 ** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 **
 ** Any permitted reproduction of these routines, in whole or in part,
@@ -46,7 +46,7 @@ static void map4_write(uint32 address, uint8 value)
    case 0x8000:
       command = value;
       vrombase = (command & 0x80) ? 0x1000 : 0x0000;
-      
+
       if (reg != (value & 0x40))
       {
          if (value & 0x40)
@@ -138,6 +138,11 @@ static void map4_write(uint32 address, uint8 value)
       break;
 
    default:
+      //printf("map004: unhandled write: address=%p, value=0x%x\n", (void*)address, value);
+      __asm__("nop");
+      __asm__("nop");
+      __asm__("nop");
+      __asm__("nop");
       break;
    }
 

nesemu-go/sdkconfig

@@ -176,7 +176,7 @@ CONFIG_SPIRAM_TYPE_ESPPSRAM32=y
 CONFIG_SPIRAM_SIZE=4194304
 CONFIG_SPIRAM_SPEED_40M=y
 CONFIG_SPIRAM_MEMTEST=
-CONFIG_SPIRAM_CACHE_WORKAROUND=y
+CONFIG_SPIRAM_CACHE_WORKAROUND=
 CONFIG_MEMMAP_TRACEMEM=
 CONFIG_MEMMAP_TRACEMEM_TWOBANKS=
 CONFIG_ESP32_TRAX=