Adding option to boot from BIOS. Untested.

.gitignore

@@ -2,8 +2,15 @@
 *.u
 *.z
 *.gcda
+*.gba
+*.bin
 gpsp.gpe
 tags
 cscope.out
 pandora/linux
 bittboy/gpsp
+x86/*.txt
+bittboy/*.txt
+x86/*.cfg
+x86/gpsp
+bittboy/*.cfg

bittboy/Makefile

@@ -5,7 +5,7 @@
 
 # Global definitions
 
-CC        = /opt/bittboy-toolchain/usr/bin/arm-miyoo-linux-musleabi-gcc
+CC        = /opt/bittboy-toolchain/usr/bin/arm-linux-gcc
 
 OBJS      = main.o cpu.o memory.o video.o input.o sound.o gui.o \
             cheats.o zip.o arm_stub.o  warm.o cpu_threaded.o video_blend.o sha1.o imageio.o
@@ -16,12 +16,12 @@ BIN       = gpsp
 
 VPATH      += .. ../arm
 CFLAGS     += -DARM_ARCH -DPC_BUILD -DBITTBOY -Wall
-CFLAGS     += -Ofast -fdata-sections -ffunction-sections -flto -fno-PIC -fprofile-use
-CFLAGS     += `/opt/bittboy-toolchain/arm-miyoo-linux-musleabi/sysroot/usr/bin/sdl-config --cflags`
+CFLAGS     += -Ofast -fdata-sections -ffunction-sections -fsingle-precision-constant -fno-PIC -flto -march=armv5te -mtune=arm926ej-s -fprofile-generate=./profile
+CFLAGS     += `/opt/bittboy-toolchain/arm-buildroot-linux-musleabi/sysroot/usr/bin/sdl-config --cflags`
 
 # expecting to have PATH set up to get correct sdl-config first
 
-LIBS       = -lc -lgcc -lSDL -lpng -lasound -lz -Wl,--as-needed -Wl,--gc-sections -flto -s
+LIBS       = -nodefaultlibs -lc -lgcc -lSDL -lpng -lasound -lz -Wl,--as-needed -Wl,--gc-sections -flto -s
 
 # Compilation:
 

cpu.c

@@ -4429,7 +4429,7 @@ void execute_arm(u32 cycles)
   }
 }
 
-void init_cpu()
+void init_cpu(uint32_t BootFromBIOS)
 {
   u32 i;
 
@@ -4439,7 +4439,9 @@ void init_cpu()
   }
 
   reg[REG_SP] = 0x03007F00;
-  reg[REG_PC] = 0x08000000;
+  reg[REG_PC] = BootFromBIOS
+    ? 0x00000000
+    : 0x08000000;
   reg[REG_CPSR] = 0x0000001F;
   reg[CPU_HALT_STATE] = CPU_ACTIVE;
   reg[CPU_MODE] = MODE_USER;

cpu.h

@@ -208,7 +208,7 @@ extern u32 memory_writes_u8;
 extern u32 memory_writes_u16;
 extern u32 memory_writes_u32;
 
-void init_cpu();
+void init_cpu(uint32_t BootFromBIOS);
 void move_reg();
 
 #endif

gui.c

@@ -19,6 +19,8 @@
 #include "common.h"
 #include "font.h"
 
+extern u32 BootBIOS;
+
 #ifndef _WIN32_WCE
 
 #include <sys/stat.h>
@@ -986,6 +988,8 @@ s32 load_config_file()
         gamepad_config_map[PLAT_MENU_BUTTON] = BUTTON_ID_MENU;
       }*/
 #endif
+		BootBIOS = file_options[FILE_OPTION_COUNT-1];
+
 		file_close(config_file);
     }
 
@@ -1060,6 +1064,8 @@ s32 save_config_file()
     }
 #endif
 
+	file_options[FILE_OPTION_COUNT-1] = BootBIOS;
+
     file_write_array(config_file, file_options);
 
     file_close(config_file);
@@ -1259,6 +1265,12 @@ u32 menu(u16 *original_screen)
        menu_update_clock();
     }
   }
+
+  void menu_bios()
+  {
+    if (BootBIOS == 1) BootBIOS = 0;
+    else BootBIOS = 1;
+  }
 
   void menu_restart()
   {
@@ -1682,8 +1694,13 @@ u32 menu(u16 *original_screen)
      "loaded.", 9),
     action_option(menu_exit, NULL, "Return to game",
      "Select to exit this menu and resume gameplay.", 10),
+
+    numeric_selection_action_option(menu_bios, NULL,
+     "Boot to BIOS : ", &BootBIOS, 2,
+     "0 for no, 1 for YES", 11),
+
     action_option(menu_quit, NULL, "Exit gpSP",
-     "Select to exit gpSP and return to the menu.", 12)
+     "Select to exit gpSP and return to the menu.", 13)
   };
 
   make_menu(main, submenu_main, NULL);

main.c

@@ -19,6 +19,8 @@
 
 #include "common.h"
 
+u32 BootBIOS = 0;
+
 #ifdef PSP_BUILD
 
 //PSP_MODULE_INFO("gpSP", 0x1000, 0, 6);
@@ -328,7 +330,7 @@ int main(int argc, char *argv[])
     set_gba_resolution(screen_scale);
     video_resolution_small();
 
-    init_cpu();
+    init_cpu(BootBIOS);
     init_memory();
   }
   else
@@ -353,7 +355,7 @@ int main(int argc, char *argv[])
       set_gba_resolution(screen_scale);
       video_resolution_small();
 
-      init_cpu();
+      init_cpu(BootBIOS);
       init_memory();
     }
   }
@@ -908,7 +910,7 @@ void reset_gba()
 {
   init_main();
   init_memory();
-  init_cpu();
+  init_cpu(BootBIOS);
   reset_sound();
 }
 

x86/Makefile

@@ -9,15 +9,15 @@ AS        = as
 
 PREFIX    = /usr
 OBJS      = main.o cpu.o memory.o video.o input.o sound.o \
-	    cpu_threaded.o gui.o x86_stub.o cheats.o zip.o sha1.o
+	    cpu_threaded.o gui.o x86_stub.o cheats.o zip.o sha1.o imageio.o
 BIN       ?= gpsp 
 
 # Platform specific definitions 
 
 VPATH      += ..
-CFLAGS     += -DPC_BUILD -Wall -m32
+CFLAGS     += -DPC_BUILD -Wall -m32 -O0 -g
 INCLUDES   = `sdl-config --cflags`
-LIBS       = `sdl-config --libs` -lz -m32
+LIBS       = `sdl-config --libs` -lz -m32 -lpng
 
 # Compilation: