Constant SLOT_CFG_ECC_GENKEY_ONLY 

const SLOT_CFG_ECC_GENKEY_ONLY: u16 = 0x2181;

SlotConfig for ECC P-256 slots that allow GenKey but not PrivWrite.

Used by slots 0 and 1, the maximum-security identity slots.

Bits: IsSecret=1, GenKey=1, ExtSig=1, WriteConfig=Never.