#163640 - cornaljoe - Tue Oct 07, 2008 2:29 pm
When using this code to boot into GBA mode from DS mode, some carts don't reboot properly. They hang at the GBA logo with no Nintendo logo. I believe the problem is the way these carts partially boot the DS firmware. Is there a way to completely reboot the DS with the firmware intact to insure GBA mode doesn't freeze?
ARM9
ARM7
ARM9
| Code: |
| inline void clearmem(u32 dest, u32 size)
{ int i=0; swiFastCopy(&i, (u32*)dest, 0x01000000 | (size>>2)); } void main() { sysSetBusOwners(BUS_OWNER_ARM7,BUS_OWNER_ARM7); swiDelay(0x200000); REG_IME=0; REG_IE=0; REG_DISPSTAT=0; DISPLAY_CR=0; SUB_DISPLAY_CR=0; clearmem(0x40000B0, 0x30); REG_POWERCNT=1; VRAM_CR=0x80808080; VRAM_E_CR=0x80; VRAM_F_CR=0x80; VRAM_G_CR=0x80; VRAM_H_CR=0x80; VRAM_I_CR=0x80; clearmem(0x6800000,0xA4000); VRAM_CR=0; VRAM_E_CR=0; VRAM_F_CR=0; VRAM_G_CR=0; VRAM_H_CR=0; VRAM_I_CR=0; REG_POWERCNT=POWER_SWAP_LCDS | POWER_ALL_2D; clearmem(0x5000000, 0x800); clearmem(0x7000000, 0x800); if(((PERSONAL_DATA *)0x023FFC80)->_user_data.gbaScreen) { REG_POWERCNT &= ~POWER_SWAP_LCDS; }else { REG_POWERCNT |= POWER_SWAP_LCDS; } REG_IPC_FIFO_TX = 0x88888888; } |
ARM7
| Code: |
| void main()
{ uint8 current, backlight; if(((PERSONAL_DATA *)0x023FFC80)->_user_data.gbaScreen) { backlight = ~PM_BACKLIGHT_TOP; }else { backlight = ~PM_BACKLIGHT_BOTTOM; } // Reset the clock if needed rtcReset(); //enable sound powerON(POWER_SOUND); SOUND_CR = SOUND_ENABLE | SOUND_VOL(0x7F); REG_SPICNT = SPI_ENABLE | SPI_DEVICE_POWER | SPI_BAUD_1MHz | SPI_CONTINUOUS; REG_SPIDATA = 0x80; SerialWaitBusy(); REG_SPICNT = SPI_ENABLE | SPI_DEVICE_POWER | SPI_BAUD_1MHz ; REG_SPIDATA = 0; SerialWaitBusy(); current = REG_SPIDATA & 0xff; current = current & backlight; SerialWaitBusy(); REG_SPICNT = SPI_ENABLE | SPI_DEVICE_POWER | SPI_BAUD_1MHZ | SPI_CONTINUOUS; REG_SPIDATA = 0; SerialWaitBusy(); REG_SPICNT = SPI_ENABLE | SPI_DEVICE_POWER | SPI_BAUD_1MHZ; REG_SPIDATA = current; SerialWaitBusy(); swiSwitchToGBAMode(); } |