CONFIG9 Registers

Registers

NAME	PHYSICAL ADDRESS	WIDTH
?	0x10000000	1
?	0x10000001	1
?	0x10000004	4
REG_CARDCONF	0x1000000C	2
?	0x10000010	1
?	0x10010000	4
REG_UNITINFO	0x10010010	1

REG_CARDCONF

Bit	Description
1-0	Gamecard active controller select (0=NTRCARD, 1=?, 2=CTRCARD1, 3=CTRCARD2)
8	?

Depending on the gamecard controller that has been selected, one of the following gamecard registers will become active:

• Selecting NTRCARD will activate the register space at 0x10164000.
• Selecting CTRCARD1 will activate the register space at 0x10004000.
• Selecting CTRCARD2 will activate the register space at 0x10005000.

0x10000000, Hidden bootrom off-switch

ARM9 bootrom 0xFFFF8000+ is disabled by writing 1 to (u8*)0x10000000 and 1 to (u8*)0x10000001?

Writing values here(u8 0x10000000+0) sets the specified bitmask. Thus, writing value 0x2 when the register(u8 0x10000000+0) was previously set to value 0x1 changes the value to 0x3. During the NATIVE_FIRM ARM9 kernel startup, it will check if bitmask 0x2 in this register is set. If that bitmask is not set, the console-unique portions of the two console-unique TWL keyslots are then initialized. The kernel then writes value 0x2 to this register, regardless of the previous bitmask value(due to this, the console-unique TWL key-data init is only done at hard-boot).

0x10010000

Initially this is value zero. NATIVE_FIRM writes value 1 here when a FIRM launch begins. The LGY FIRM writes value 3 here when handling PXI command 0x00020080(first TWL PXI command), it also writes value 7 here when handling PXI command 0x00030080(first AGB PXI command). This register can be read to determine what "mode" the system is running under: hard-boot, FIRM launch, or TWL/AGB FIRM.

REG_UNITINFO

This 8-bit register is value zero for retail, non-zero for dev/debug units.