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→GBA VC
=GBA VC=
=GBA VC=
GBA VC is run by [[FIRM|AGB_FIRM]]. RomFS isn't used for GBA VC titles, but can be found empty within GBA VC titles. The NCCH [[ExeFS]] contains the same files as a normal application. The [[ExeFS]]:/.code contains the GBA VC ROM followed by a 0x360 footer.
GBA VC is run by [[FIRM|AGB_FIRM]]. RomFS isn't used for GBA VC titles, but can be found empty within GBA VC titles. The NCCH [[ExeFS]] contains the same files as a normal application. The [[ExeFS]]:/.code contains the GBA VC ROM followed by a 0x360 byte long footer.
===Footer===
===Footer===
All values in the GBA VC Footer are Little Endian.
All values in the GBA VC footer are little-endian.
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
|-
|-
| 0x008
| 0x008
| 0x2
| 0x4
| Unknown
| Save type (see below)
|-
| 0x020
| 0x1
| Manufacturer info select (see below)
|-
|-
| 0x02A
| 0x024
| 0x2FA
| 0x300
| Unknown
| Unknown, three different types of this data have been observed.
|-
|-
| 0x338
| 0x338
| 0x35A
| 0x35A
| 0x2
| 0x2
| GBA ROM Filesize per MB
| High two bytes of GBA ROM file size
|}
|}
Save types:
* EEPROM (various sizes, IDs specified in footer): 0x2
* SRAM/FRAM (128k): 0xE
* Flash (512k): 0x9
Support for RTC and 1m-flash chips is not implemented in AGB_FIRM.
Manufacturer info:
GBA games' SDK-provided save code only supports a range of manufacturers from which Nintendo was buying memory from around the time of that game's development. As such, most games don't support a generic emulated storage chip. This byte appears to select a manufacturer info set to emulate. This has been observed to be 0x90, 0xC0, and (in one EEPROM-based game), 0x80.
* SRAM games up to and including V111 use 0xC0. Above use 0x90.
* FRAM V103 uses 0xC0. V104+ don't exist, and lower versions also likely use 0xC0.
* Flash V124 was observed 0x90, V131 was observed 0xC0.
* EEPROM-based games vary wildly, since they can likely specify chip info in the 0x10-region of the footer.