diff --git a/src/memory.c b/src/memory.c
index 3797114..d276178 100644
--- a/src/memory.c
+++ b/src/memory.c
@@ -191,7 +191,14 @@ uint32_t load_rom(uint8_t* filename, uint32_t base_addr, uint8_t flags) {
   }
   filesize = file_handle.fsize;
   smc_id(&romprops);
+  file_close();
+  /* reconfigure FPGA if necessary */
+  if(romprops.fpga_conf) {
+    printf("reconfigure FPGA with %s...\n", romprops.fpga_conf);
+    fpga_pgm((uint8_t*)romprops.fpga_conf);
+  }
   set_mcu_addr(base_addr);
+  file_open(filename, FA_READ);
   f_lseek(&file_handle, romprops.offset);
   for(;;) {
     ff_sd_offload=1;
@@ -226,7 +233,6 @@ uint32_t load_rom(uint8_t* filename, uint32_t base_addr, uint8_t flags) {
     sram_writebyte(0xfc, rombase+0xd5);
     set_fpga_time(0x0220110301180530LL);
   }
-fpga_pgm((uint8_t*)"/sd2snes/cx4.bit");
   if(romprops.has_dspx || romprops.has_cx4) {
     printf("DSPx game. Loading firmware image %s...\n", romprops.dsp_fw);
     load_dspx(romprops.dsp_fw, romprops.fpga_features);
diff --git a/src/smc.c b/src/smc.c
index 202c2ff..3a07223 100644
--- a/src/smc.c
+++ b/src/smc.c
@@ -85,6 +85,7 @@ void smc_id(snes_romprops_t* props) {
   props->has_st0010 = 0;
   props->has_cx4 = 0;
   props->fpga_features = 0;
+  props->fpga_conf = NULL;
   for(uint8_t num = 0; num < 6; num++) {
     if(!file_readblock(header, hdr_addr[num], sizeof(snes_header_t))
        || file_res) {
@@ -155,6 +156,7 @@ void smc_id(snes_romprops_t* props) {
       if (header->map == 0x20 && header->carttype == 0xf3) {
         props->has_cx4 = 1;
         props->dsp_fw = CX4FW;
+        props->fpga_conf = FPGA_CX4;
         props->fpga_features |= FEAT_CX4;
       }
       else if ((header->map == 0x20 && header->carttype == 0x03) ||
diff --git a/src/smc.h b/src/smc.h
index 561078f..8e77b7c 100644
--- a/src/smc.h
+++ b/src/smc.h
@@ -35,6 +35,8 @@
 #define DSPFW_ST0010 ((const uint8_t*)"/sd2snes/st0010.bin")
 #define CX4FW ((const uint8_t*)"/sd2snes/cx4.bin")
 
+#define FPGA_CX4 ((const uint8_t*)"/sd2snes/fpga_cx4.bit")
+
 typedef struct _snes_header {
   uint8_t maker[2];     /* 0xB0 */
   uint8_t gamecode[4];  /* 0xB2 */
@@ -62,6 +64,7 @@ typedef struct _snes_romprops {
   uint32_t ramsize_bytes;     /* CartRAM size in bytes */
   uint32_t romsize_bytes;     /* ROM size in bytes (rounded up) */
   const uint8_t* dsp_fw;      /* DSP (NEC / Hitachi) ROM filename */
+  const uint8_t* fpga_conf;   /* FPGA config file to load (default: base) */
   uint8_t has_dspx;           /* DSP[1-4] presence flag */
   uint8_t has_st0010;         /* st0010 presence flag (additional to dspx)*/
   uint8_t has_msu1;           /* MSU1 presence flag */