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improve ExMemCnt handling and defaults

This commit is contained in:
Jaklyy 2024-12-09 19:30:47 -05:00
parent 8382769073
commit b048e0cbfd
1 changed files with 4 additions and 4 deletions
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8
src/NDS.cpp
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@ -484,8 +484,8 @@ void NDS::Reset()
MapSharedWRAM(0); MapSharedWRAM(0);
ExMemCnt[0] = 0xC000; // checkme: should bit 15 be set by default? ExMemCnt[0] = 0xE88C; // checkme: is this correct? ...and what does bit 10 do...? it can be set on 3ds it seems...
ExMemCnt[1] = 0xC000; ExMemCnt[1] = 0xE88C; // note: these should only matter for direct boot; bios sets these values fairly quickly during native boot
memset(ROMSeed0, 0, 2*8); memset(ROMSeed0, 0, 2*8);
memset(ROMSeed1, 0, 2*8); memset(ROMSeed1, 0, 2*8);
SetGBASlotTimings(); SetGBASlotTimings();
@ -3802,8 +3802,8 @@ void NDS::ARM9IOWrite16(u32 addr, u16 val)
case 0x04000204: case 0x04000204:
{ {
u16 oldVal = ExMemCnt[0]; u16 oldVal = ExMemCnt[0];
ExMemCnt[0] = val; ExMemCnt[0] = (ExMemCnt[0] & 0x7700) | (val & 0x88FF);
ExMemCnt[1] = (ExMemCnt[1] & 0x007F) | (val & 0xFF80); ExMemCnt[1] = (ExMemCnt[1] & 0x777F) | (val & 0x8880);
if ((oldVal ^ ExMemCnt[0]) & 0xFF) if ((oldVal ^ ExMemCnt[0]) & 0xFF)
SetGBASlotTimings(); SetGBASlotTimings();
return; return;