Add back VRAM boost

Author: RocketRobz

arm9/source/conf_sd.c

@@ -139,6 +139,10 @@ static int callback(const char *section, const char *key, const char *value, voi
 		// Boost CPU
 		conf->boostCpu = (bool)strtol(value, NULL, 0);
 
+	} else if (match(section, "NDS-BOOTSTRAP", key, "BOOST_VRAM")) {
+		// Boost VRAM
+		conf->boostVram = (bool)strtol(value, NULL, 0);
+
 	} else {
 		// Unknown section/name
 		//return 0; // Error

arm9/source/main.c

@@ -268,6 +268,11 @@ static int runNdsFile(configuration* conf) {
 		fifoSendValue32(FIFO_USER_06, 1);
 	}
 
+	// Boost VRAM
+	if (conf->boostVram) {
+		dbg_printf("VRAM boosted\n");
+	}
+
 	fifoSendValue32(FIFO_USER_03, 1);
 	fifoWaitValue32(FIFO_USER_05);
 

arm9/source/nds_loader_arm9.c

@@ -236,6 +236,7 @@ void runNds(const void* loader, u32 loaderSize, u32 cluster, u32 saveCluster, co
 	lc0->consoleModel    = conf->consoleModel;
 	lc0->loadingScreen   = conf->loadingScreen;
 	lc0->romread_LED     = conf->romread_LED;
+	lc0->boostVram       = conf->boostVram;
 	lc0->gameSoftReset   = conf->gameSoftReset;
 	lc0->asyncPrefetch   = conf->asyncPrefetch;
 	lc0->soundFix        = conf->soundFix;

bootloader/source/arm7/load_crt0.s

@@ -39,6 +39,7 @@
 	.global consoleModel
 	.global loadingScreen
 	.global romread_LED
+	.global boostVram
 	.global gameSoftReset
 	.global asyncPrefetch
 	.global soundFix
@@ -86,6 +87,8 @@ loadingScreen:
 	.word	0x00000000
 romread_LED:
 	.word	0x00000000
+boostVram:
+	.word	0x00000000
 gameSoftReset:
 	.word	0x00000000
 asyncPrefetch:

bootloader/source/arm9/main.arm9.c

@@ -45,6 +45,7 @@ extern void arm9_clearCache(void);
 
 tNDSHeader* ndsHeader = NULL;
 bool dsiModeConfirmed = false;
+extern u32 boostVram;
 volatile int arm9_stateFlag = ARM9_BOOT;
 volatile u32 arm9_BLANK_RAM = 0;
 volatile int arm9_screenMode = 0; // 0 = Regular, 1 = Pong, 2 = Tic-Tac-Toe
@@ -189,6 +190,9 @@ void arm9_main(void) {
 	//);
 
 	REG_SCFG_EXT = 0x8300C000;
+	if (boostVram) {
+		REG_SCFG_EXT |= BIT(13);	// Extended VRAM Access
+	}
 
 	screenBrightness = 31;
 	fadeType = true;

common/include/load_crt0.h

@@ -24,6 +24,7 @@ typedef struct loadCrt0 {
     u32 consoleModel;
     u32 loadingScreen;
     u32 romread_LED;
+    u32 boostVram;
     u32 gameSoftReset;
     u32 asyncPrefetch;
     u32 soundFix;