loader.h

#ifndef LOADER_H_
#define LOADER_H_

enum LOADER_CONFIG{
	LOADER_CTRL_OFFSET = 8,
	STACK_OFFSET = 0x00000800, //stack start
	RAM_OFFSET = STACK_OFFSET, //buffer for reading/writing flash
	FLASH_ADDR = 0,
	FLASH_SIZE = 0,
	RQX_INIT = 0,
	ERR_INIT = 0,
	LOADER_VERSION_MAJOR = 1,
	LOADER_VERSION_MINOR = 0,
};

enum RQX {
	RQX_NONE = 0,
	RQX_FLASH_CONFIG_SPI_CMD = 1UL,
	//RESERVED,
	RQX_FLASH_ERASE_CHIP = 3UL,
	RQX_FLASH_ERASE_BLOCK_64KIB = 4UL,
	RQX_FLASH_ERASE_SECTOR_4KIB = 5UL,
	RQX_FLASH_READ = 6UL,
	RQX_FLASH_WRITE_PAGE = 7UL,
};

typedef volatile struct {
	unsigned long STKOFF;   // stack ptr offset from the start of loader: 0x08
	unsigned long RMEMOFF;  // RAM data buffer offset: 0x0C
	unsigned long CMDCTR;   // executed command counter: 0x10
	unsigned long STATUS;	// status: 0x14
	unsigned long RQX;      // Request field: 0x18
	unsigned long ERR;      // Error code: 0x1C
	unsigned long FMEMADDR; // flash: 0x20
	unsigned long FMEMSIZE; // flash: 0x24
	unsigned long LOADER_MAJOR; // version
	unsigned long LOADER_MINOR; // version
	union{
		unsigned long FLASH_INFO;
		struct __attribute__((packed)) {
			unsigned char FLASH_INIT_STATUS_REG;
			unsigned char FLASH_JEDEC_ID[3];
		};
		unsigned char FLASH_INFO_B[4];
	};
	unsigned long RESERVED[7];

} CTRL;

enum {
	ERRCODE_OK,
	ERRCODE_FAILED_TO_INIT_FLASH_SPI_MODE,
	ERRCODE_FLASH_TEST_FAILED,
};

enum {
	CTRL_STATUS_BUSY_POS = 0,
	CTRL_STATUS_BUSY = 1UL << CTRL_STATUS_BUSY_POS,
};

#endif /* LOADER_H_ */