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* The only difference in .data(besides the above code binary) is that the New3DS proc9 has an additional 0x10-byte block for the keyslot 0x5 keyY, see above.
* The only difference in .data(besides the above code binary) is that the New3DS proc9 has an additional 0x10-byte block for the keyslot 0x5 keyY, see above.
== NATIVE_FIRM and SAFE_MODE_FIRM ==
== Variations ==
NATIVE_FIRM is the FIRM which is installed to the [[Flash_Filesystem|NAND]] firm partitions, which is loaded by bootrom. SAFE_MODE_FIRM and NATIVE_FIRM for the initial versions are exactly the same, except for the system core version fields. SAFE_MODE is used for running the [[System_Settings#System_Updater|System Updater]].
There exists different official firmwares for the 3DS: The default one (NATIVE_FIRM) is used to run all 3DS content and boots by default, while backwards compatibility is handled by TWL_FIRM and AGB_FIRM. There furthermore is a rescue mode provided by SAFE_MODE_FIRM.
=== NATIVE_FIRM ===
NATIVE_FIRM is the FIRM which is installed to the [[Flash_Filesystem|NAND]] firm partitions, which is loaded by bootrom.
An overview of NATIVE_FIRM versions along with their contentID is given in [[Configuration_Memory#NATIVE_FIRM_Versions|Configuration Memory]].
An overview of NATIVE_FIRM versions along with their contentID is given in [[Configuration_Memory#NATIVE_FIRM_Versions|Configuration Memory]].
== TWL_FIRM and AGB_FIRM ==
=== SAFE_MODE_FIRM ===
SAFE_MODE is used for running the [[System_Settings#System_Updater|System Updater]]. SAFE_MODE_FIRM and NATIVE_FIRM for the initial versions are exactly the same, except for the system core version fields.
=== TWL_FIRM ===
=== TWL_FIRM ===
TWL_FIRM handles DS(i) backwards compatibility.
The 3DS-mode ARM9 core seems to switch into DSi-mode(for running DSi-mode ARM9 code) by writing to a [[PDN]] register(this changes the memory layout to DSi-mode / etc, therefore this register poke *must* be executed from ITCM). This is the final 3DS-mode register poke before the ARM9 switches into DSi-mode. DS(i)-mode ARM7 code is run on the internal [[ARM7]] core, which is started up during TWL_FIRM boot. Trying to read from the exception-vector region(address 0x0) under this DSi-mode ARM7 seems to only return 0x00/0xFF data. Also note that this DSi-mode ARM7 runs code(stored in TWL_FIRM) which pokes some DSi-mode registers that on the DSi were used for disabling access to the DSi bootROMs, however these registers do not affect the 3DS DSi-mode ARM9/ARM7 "bootrom" region(exceptionvector region + 0x8000) at all.
The 3DS-mode ARM9 core seems to switch into DSi-mode(for running DSi-mode ARM9 code) by writing to a [[PDN]] register(this changes the memory layout to DSi-mode / etc, therefore this register poke *must* be executed from ITCM). This is the final 3DS-mode register poke before the ARM9 switches into DSi-mode. DS(i)-mode ARM7 code is run on the internal [[ARM7]] core, which is started up during TWL_FIRM boot. Trying to read from the exception-vector region(address 0x0) under this DSi-mode ARM7 seems to only return 0x00/0xFF data. Also note that this DSi-mode ARM7 runs code(stored in TWL_FIRM) which pokes some DSi-mode registers that on the DSi were used for disabling access to the DSi bootROMs, however these registers do not affect the 3DS DSi-mode ARM9/ARM7 "bootrom" region(exceptionvector region + 0x8000) at all.
* Returns an address for msg_curpos+1.
* Returns an address for msg_curpos+1.
totalhashdatasize = rsasig_bytesize - above position in the message for the hashdata. The actual "totalhashdatasize" in the RSA message must be <= <expected hashdata_size>(0x74 for bootloader). The TWL_FIRM code copies the RSA "hashdata" to the output buffer, using the actual size of the RSA "hashdata".
totalhashdatasize = rsasig_bytesize - above position in the message for the hashdata. The actual "totalhashdatasize" in the RSA message must be <= <expected hashdata_size>(0x74 for bootloader). The TWL_FIRM code copies the RSA "hashdata" to the output buffer, using the actual size of the RSA "hashdata".
=== AGB_FIRM ===
AGB_FIRM handles running GBA VC titles. The ARM9 FIRM section for TWL_FIRM and AGB_FIRM are exactly the same (for TWL_FIRM and AGB_FIRM versions which were updated with the same system-update).
== FIRM Launch Parameters ==
== FIRM Launch Parameters ==