Configuration Memory

Memory

NAME	PROCESS VIRTUAL ADDRESS	WIDTH
?	0x1FF80000	1
KERNELVERSIONMINOR	0x1FF80001	1
KERNELVERSIONMAJOR	0x1FF80002	1
?	0x1FF80003	1
UPDATEFLAG	0x1FF80004	4
NSTID	0x1FF80008	8
SYSCOREVER	0x1FF80010	4
UNITINFO	0x1FF80014	1
APPMEMALLOC	0x1FF80040	4
FIRMVERSIONMINOR	0x1FF80061	1
FIRMVERSIONMAJOR	0x1FF80062	1
FIRMSYSCOREVER	0x1FF80064	4
MENUTID	0x1FF810A0	8
ACTIVEMENUTID	0x1FF810A8	8

All of these fields are initialized by the ARM11 kernel, except for MENUTID and ACTIVEMENUTID which are set by NS.

KERNELVERSIONMINOR

This is the kernel version-minor, this likely isn't obtained from the FIRM title-version.

FIRMVERSIONMINOR

This is the same as KERNELVERSIONMINOR.

KERNELVERSIONMAJOR

This is the ((title-version & 0x3FF) >> 4), for the currently running FIRM.

FIRMVERSIONMAJOR

This is the same as KERNELVERSIONMAJOR. After AM:InstallNATIVEFIRM checks FIRMSYSCOREVER, AM:InstallNATIVEFIRM then compares FIRMVERSIONMAJOR with the NATIVE_FIRM ((title-version & 0x3FF) >> 4), when the latter is larger than FIRMVERSIONMAJOR AM:InstallNATIVEFIRM will trigger a FIRM install.

UPDATEFLAG

Normally this flag is zero, however when the ARM11 kernel is booting it will set this flag to 1, if the following PAD buttons are pressed: L, R, A, Up. When this flag is set, the system will launch the System Updater title instead of displaying the Home Menu.

NSTID

This field contains the titleID of the first title to launch from CTR-NAND after the FIRM system processes are loaded. The PM module launches this title. If this field titleID is all-zero, the system will not attempt to launch the title. The regular ARM11 kernel sets this to the regular NS titleID, while the SAFE_MODE ARM11 kernel sets this to the SAFE_MODE NS titleID.

SYSCOREVER

When launching CXIs, the value stored here must match the core version field stored in the CXI exheader. If they do not match, the PM module will refuse to launch the ARM11 process. The regular ARM11 kernel sets this to 0x2, while the SAFE_MODE ARM11 kernel sets this to 0x3.

FIRMSYSCOREVER

Normally this is the same as SYSCOREVER. This used by AM:InstallNATIVEFIRM for comparing with the NATIVE_FIRM titleID-low. When the low u8 from the NATIVE_FIRM titleID-low is larger than FIRMSYSCOREVER, AM:InstallNATIVEFIRM will trigger FIRM installing. When that u8 is not larger than FIRMSYSCOREVER, and these two values don't match, AM:InstallNATIVEFIRM will return an error.

UNITINFO

Bit	Description
0	Clear for dev unit, set for retail
1	Set for debug units
2-7	?

Normally this register is all-zero, however bit1 in this field is set by the ARM11 kernel when ARM debug CP14 DSCR bit14 is set. NS loads the menu TID from MENUTID when bits 1-7 of this register are clear. ErrDisp will display development error info when bit0 is clear.

APPMEMALLOC

This contains the total size of the memory that can be allocated with the application memory-type. On retail this is 64MB for prod.

MENUTID

This contains the titleID of the retail menu which will be launched by NS.

ACTIVEMENUTID

This contains the titleID of the currently running menu launched by NS. Normally this is the home menu TID from MENUTID, but if launching that fails this titleID is the alternate menu.(On debug units this is the TID loaded from config)