qmk-firmware/platforms/chibios/eeprom_teensy.h

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// Copyright 2022 Nick Brassel (@tzarc)
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <ch.h>
#include <hal.h>
#if defined(K20x)
/* Teensy 3.0, 3.1, 3.2; mchck; infinity keyboard */
// The EEPROM is really RAM with a hardware-based backup system to
// flash memory. Selecting a smaller size EEPROM allows more wear
// leveling, for higher write endurance. If you edit this file,
// set this to the smallest size your application can use. Also,
// due to Freescale's implementation, writing 16 or 32 bit words
// (aligned to 2 or 4 byte boundaries) has twice the endurance
// compared to writing 8 bit bytes.
//
# ifndef EEPROM_SIZE
# define EEPROM_SIZE 32
# endif
#elif defined(KL2x) /* Teensy LC (emulated) */
# define EEPROM_SIZE 128
#else
# error Unsupported Teensy EEPROM.
#endif