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For shutting down the system(?), TWL_FIRM writes u8 value 8 to [[I2C]] MCU register 0x20. For returning to 3DS-mode, TWL_FIRM writes value 4 to that MCU register to trigger a hardware system reboot.
For shutting down the system(?), TWL_FIRM writes u8 value 8 to [[I2C]] MCU register 0x20. For returning to 3DS-mode, TWL_FIRM writes value 4 to that MCU register to trigger a hardware system reboot.
== FIRM Launch Parameters ==
The FIRM-launch parameters structure is located at FCRAM+0, size 0x1000-bytes. The ARM11-kernel copies this structure elsewhere, then clears the 0x1000-bytes at FCRAM+0.
{| class="wikitable" border="1"
|-
! OFFSET
! SIZE
! DESCRIPTION
|-
| 0x400
| 0x1
| This can be used for overriding the default FCRAM [[Memory_layout|memory-regions]] allocation sizes(APPLICATION, SYSTEM, and BASE).
|}