There are few things you need to change for BFSB hardware:
in bitfury-config.h
#define BITFURY_MAXBANKS 8
#define BITFURY_BANKCHIPS 14
should be
#define BITFURY_MAXBANKS 4
#define BITFURY_BANKCHIPS 64
as there are 4 banks of 4 boards, each with 16 chips
Then in tm_i2c.c you need to comment out (ore remove) the line
#define BF_OE_ACTIVE_LOW
and to change the bank definitions (bf_bank_gpio) to the ones for BFSB i.e.
static const int bf_bank_gpio[BITFURY_MAXBANKS] = {18,23,24,25};