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typedef struct
{
	uint32_t region_free;	// 0 - off, 1 - on (patch bios region protection)
	uint32_t force_vga;		// 0 - off, 1 - on (patch vga flag bios check)
	uint32_t IGR; 			// 0 - off, 1 - on (In-Game Reset)
	uint32_t boot_intro;	// 0 - skip, 1 - show (boot animation)
	uint32_t sega_license;	// 0 - skip, 1 - show (IP.BIN license screen) 
	uint32_t game_region;	// 0 - J, 1 - U, 2 - E
	uint32_t disc_type;		// 0 - CD, 1 - GD
	uint32_t need_game_fix; // 0 - no, 1 - yes
} ldr_params_t;

ldr_params_t run_params;

void run_game(void)
{
	FILE *fd;
	uint32_t file_size;
	
	fd = fs_open("/rd/loader.bin", "rb");
	fseek(fd, 0, SEEK_END);
	file_size = ftell(fd);
	fseek(fd, 0, SEEK_SET);
	
	fread((void *) 0x8CD00000, 1, file_size, fd);
	fclose(fd);
	
	run_params.game_region = get_game_region();
	run_params.disc_type = is_GD_disc();
	run_params.need_game_fix = need_game_fix();
	
	memcpy((void *) 0xACCFFF00, (void *) &run_params, 0x20);
	arch_exec(0x8CD00000, file_size);
}

uint32_t get_game_region(void)
{
	/* this function check region in IP.BIN */
	/* need adaptation for open menu, but logic simple */
	
	if (NTSC-J)
	{
		return 0;
	}
	else if (NTSC-U)
	{
		return 1;
	}
	else if (PAL)
	{
		return 2;
	}
	
	/* if is region free, then get region from system variables */
	uint8_t *sys_region = (uint8_t *) 0x8C000072;
	
	return (uint32_t) (sys_region[0] & 7);
}

uint32_t is_GD_disc(void)
{
  uint32_t status, disc_type;
  
  status = disc_type = 0;
  cdrom_get_status(&status, &disc_type);
  
  return disc_type == 0x80;
}

uint32_t need_game_fix()
{
	/* this function check game name from IP.BIN */
	/* need adaptation for open menu, but logic simple */
	
	if (strncmp(name, "PSO VER.2", 9)          == 0 ||
		strncmp(name, "SONIC ADVENTURE 2", 17) == 0)
	{
		return 1;
	}
	
	return 0;
}

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alpha openMenu december release, might support CDI and over 256 games 
DAT: https://www.mediafire.com/file/lp3n6qjsbq0p6zt/DAT_12-1-21.zip/file