From c3c4e2ea3ee04b77bad3542112410d3e2a67e0c0 Mon Sep 17 00:00:00 2001
From: sorgelig <pour.garbage@gmail.com>
Date: Sun, 8 Sep 2019 08:40:06 +0800
Subject: [PATCH] some flags for dual-sdr cores.

---
 fpga_io.cpp               |  6 ++++++
 fpga_io.h                 |  1 +
 support/neogeo/loader.cpp |  3 ++-
 user_io.cpp               | 12 ++++++++++++
 user_io.h                 |  4 +++-
 5 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/fpga_io.cpp b/fpga_io.cpp
index 01cc2f3..32d2c05 100644
--- a/fpga_io.cpp
+++ b/fpga_io.cpp
@@ -605,6 +605,12 @@ int fpga_get_buttons()
 	return (gpi >> 29) & 3;
 }
 
+int fpga_get_io_type()
+{
+	fpga_gpo_write(fpga_gpo_read() | 0x80000000);
+	return (fpga_gpi_read() >> 28) & 1;
+}
+
 void reboot(int cold)
 {
 	sync();
diff --git a/fpga_io.h b/fpga_io.h
index 44cfb36..5eca6ad 100644
--- a/fpga_io.h
+++ b/fpga_io.h
@@ -15,6 +15,7 @@ int fpga_gpi_read();
 
 void fpga_set_led(uint32_t on);
 int  fpga_get_buttons();
+int fpga_get_io_type();
 
 void fpga_core_reset(int reset);
 void fpga_core_write(uint32_t offset, uint32_t value);
diff --git a/support/neogeo/loader.cpp b/support/neogeo/loader.cpp
index 6ebfebb..f462971 100644
--- a/support/neogeo/loader.cpp
+++ b/support/neogeo/loader.cpp
@@ -9,6 +9,7 @@
 #include "loader.h"
 #include "../../sxmlc.h"
 #include "../../user_io.h"
+#include "../../fpga_io.h"
 #include "../../osd.h"
 #include "../../menu.h"
 
@@ -1016,7 +1017,7 @@ int neogeo_romset_tx(char* name)
 	if (crom_start < 0x300000) crom_start = 0x300000;
 	uint32_t crom_max = crom_start + crom_sz_max;
 	uint16_t ram_sz = sdram_sz() & 3;
-	if ((ram_sz == 2 && crom_max > 0x4000000) || (ram_sz == 1 && crom_max > 0x2000000) || !ram_sz)
+	if ((!user_io_is_dualsdr() || !fpga_get_io_type()) && ((ram_sz == 2 && crom_max > 0x4000000) || (ram_sz == 1 && crom_max > 0x2000000) || !ram_sz))
 	{
 		Info("Not enough memory!\nGraphics will be corrupted");
 		sleep(2);
diff --git a/user_io.cpp b/user_io.cpp
index 2c2aa15..a523c97 100644
--- a/user_io.cpp
+++ b/user_io.cpp
@@ -47,6 +47,7 @@ static int emu_mode = EMU_NONE;
 
 // keep state over core type and its capabilities
 static unsigned char core_type = CORE_TYPE_UNKNOWN;
+static unsigned char dual_sdr = 0;
 
 static int fio_size = 0;
 static int io_ver = 0;
@@ -608,6 +609,11 @@ uint16_t sdram_sz(int sz)
 	return res;
 }
 
+int user_io_is_dualsdr()
+{
+	return dual_sdr;
+}
+
 void user_io_init(const char *path)
 {
 	char *name;
@@ -622,6 +628,12 @@ void user_io_init(const char *path)
 	fio_size = fpga_get_fio_size();
 	io_ver = fpga_get_io_version();
 
+	if (core_type == CORE_TYPE_8BIT2)
+	{
+		dual_sdr = 1;
+		core_type = CORE_TYPE_8BIT;
+	}
+
 	if ((core_type != CORE_TYPE_DUMB) &&
 		(core_type != CORE_TYPE_MINIMIG2) &&
 		(core_type != CORE_TYPE_MIST) &&
diff --git a/user_io.h b/user_io.h
index f87cbec..bfbc361 100644
--- a/user_io.h
+++ b/user_io.h
@@ -137,10 +137,11 @@
 #define CORE_TYPE_UNKNOWN   0x55
 #define CORE_TYPE_DUMB      0xa0   // core without any io controller interaction
 #define CORE_TYPE_MIST      0xa3   // mist atari st core
-#define CORE_TYPE_8BIT      0xa4   // atari 800/c64 like core
+#define CORE_TYPE_8BIT      0xa4   // generic core
 #define CORE_TYPE_MINIMIG2  0xa5   // new Minimig with AGA
 #define CORE_TYPE_ARCHIE    0xa6   // Acorn Archimedes
 #define CORE_TYPE_SHARPMZ   0xa7   // Sharp MZ Series
+#define CORE_TYPE_8BIT2     0xa8   // generic core using dual SDRAM
 
 #define UART_FLG_PPP        0x0001
 #define UART_FLG_TERM       0x0002
@@ -236,6 +237,7 @@ const char* get_rbf_name();
 const char* get_rbf_path();
 
 uint16_t sdram_sz(int sz = -1);
+int user_io_is_dualsdr();
 
 int GetUARTMode();
 int GetMidiLinkMode();