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I don't believe a formalized list of ROM functions exists.
At a high level, the ROM includes (roughly 320 KB worth):
- Core firmware
- Embedded BLE stack (L2CAP, GAP, GATT [attribute profile and protocol], SMP, HCI and below)
- Some profiles (proximity, heart rate monitor, thermometer, blood pressure monitor and time in ROM , plus more in SDK 2.0.1)
- Drivers for I2C EEPROM, SPI EEPROM and SPI Serial flash