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diff --git a/stm-keystore.h b/stm-keystore.h
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+/*
+ * stm-keystore.h
+ * ---------
+ * Functions and defines for accessing the keystore memory.
+ *
+ * Copyright (c) 2016, NORDUnet A/S All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __STM32_KEYSTORE_H
+#define __STM32_KEYSTORE_H
+
+#include "stm32f4xx_hal.h"
+#include "spiflash_n25q128.h"
+
+/* Pins connected to the FPGA config memory (SPI flash) */
+#define KSM_PROM_CS_N_Pin                  GPIO_PIN_0
+#define KSM_PROM_CS_N_GPIO_Port            GPIOB
+
+#define KEYSTORE_GPIO_INIT()		\
+    __GPIOB_CLK_ENABLE();		\
+    /* Configure GPIO pin for FPGA config memory chip select : KSM_PROM_CS_N */        \
+    gpio_output(KSM_PROM_CS_N_GPIO_Port, KSM_PROM_CS_N_Pin, GPIO_PIN_SET)
+
+
+extern SPI_HandleTypeDef hspi_keystore;
+
+extern int keystore_check_id(void);
+extern int keystore_write_data(uint32_t offset, const uint8_t *buf, const uint32_t len);
+extern int keystore_erase_sectors(int num);
+
+#endif /* __STM32_KEYSTORE_H */