ID of cart based on size

[KanedaFr]

Analysis based on method found at ff30f8 (so 0x30F8 in BIOS)

This was probably already shared but something bugged me so I looked at it myself.
=> Does the manufucter code is related to size or any size could be used with any manufacturer ?
Please correct me!!!

To read info about current ROM, BIOS first enable CFI
write 0xAA at 0x??5555
write 0x55 at 0x??2AAA
write 0x90 at 0x??5555

First read a 0x??0000 is manufacture code
- 0x98 -> Toshiba
- 0xEC -> Samsung
- 0xB0 -> Sharp

Read custom Id at 0x??0003
- byte should a value between 0x80 to 0x87

Read size at 0x??0001
- 0xAB -> 512K -> 10th block reserved for system (see BIOS 0x2EC0)
- 0x2C -> 1M -> 18th
- 0X2F -> 2M -> 34th

Read custom id at 0x??0002
- at 0x200000+ (lo ROM), this value should be the same for EACH block, else game will reset
- at 0x800000+ (hi ROM), if it's 1, it seems to enable developer mode, with auto watchdog clear, etc.... (see BIOS 0x1DC0)



Based on this, it seems there is no link between manufacturerID and sizeID

[sodthor]

you re going very low level, maybe Flavor can answer that as he designed the flash masta.
Never gone so far on my side.

[KanedaFr]

based on https://github.com/TheFlav/Flash-Masta-D....cpp#L1634, it seems it"s not handled per game on FlashMata