GBA Memory: POSTFLG support and BIOS skip register parity

CHANGES

@@ -22,6 +22,7 @@ Bugfixes:
  - GB Memory: Fix patching ROM bank 0
  - GB: Fix audio not being deinitialized
  - GBA Memory: Fix VCOUNT being writable
+ - GBA Memory: Improve initial skipped BIOS state
 Misc:
  - SDL: Remove scancode key input
  - GBA Video: Clean up unused timers
@@ -36,6 +37,7 @@ Misc:
  - Core: Clean up some thread state checks
  - Debugger: Make building with debugging aspects optional
  - GBA Memory: Support for Mo Jie Qi Bing by Vast Fame (taizou)
+ - GBA Memory: Support reading/writing POSTFLG
 
 0.5.1: (2016-10-05)
 Bugfixes:

src/gba/gba.c

@@ -215,6 +215,8 @@ void GBASkipBIOS(struct GBA* gba) {
 		} else {
 			cpu->gprs[ARM_PC] = BASE_WORKING_RAM;
 		}
+		gba->memory.io[REG_VCOUNT >> 1] = 0x7E;
+		gba->memory.io[REG_POSTFLG >> 1] = 1;
 		int currentCycles = 0;
 		ARM_WRITE_PC;
 	}

src/gba/io.c

@@ -333,6 +333,11 @@ void GBAIOInit(struct GBA* gba) {
 	gba->memory.io[REG_BG2PD >> 1] = 0x100;
 	gba->memory.io[REG_BG3PA >> 1] = 0x100;
 	gba->memory.io[REG_BG3PD >> 1] = 0x100;
+
+	if (!gba->biosVf) {
+		gba->memory.io[REG_VCOUNT >> 1] = 0x7E;
+		gba->memory.io[REG_POSTFLG >> 1] = 1;
+	}
 }
 
 void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
@@ -579,6 +584,10 @@ void GBAIOWrite8(struct GBA* gba, uint32_t address, uint8_t value) {
 		}
 		return;
 	}
+	if (address == REG_POSTFLG) {
+		gba->memory.io[(address & (SIZE_IO - 1)) >> 1] = value;
+		return;
+	}
 	if (address >= REG_DEBUG_STRING && address - REG_DEBUG_STRING < sizeof(gba->debugString)) {
 		gba->debugString[address - REG_DEBUG_STRING] = value;
 		return;