xflash_layout.h

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// XFLASH memory layout
#pragma once
#include <stdint.h>
#include "bootapp.h" // for RAMSIZE
#include "config.h"
 
#define XFLASH_SIZE 0x40000ul // size of XFLASH
 
#define DUMP_MAGIC  0x55525547ul
 
struct dump_header_t
{
    // start with a magic value to indicate the presence of a dump, so that clearing
    // a single page is sufficient for resetting the state
    uint32_t magic;
 
    uint8_t regs_present; // true when the lower segment containing registers is present
    uint8_t crash_reason; // uses values from dump_crash_source
 
    uint32_t pc;          // PC nearby the crash location
    uint16_t sp;          // SP nearby the crash location
};
 
struct dump_data_t
{
    // contiguous region containing all addressable ranges
    uint8_t regs[RAMSTART];
    uint8_t sram[RAMSIZE];
};
 
struct dump_t
{
    struct dump_header_t header;
 
    // data is page aligned (no real space waste, due to the larger
    // alignment required for the whole dump)
    struct dump_data_t __attribute__((aligned(256))) data;
};
 
#define DUMP_OFFSET ((XFLASH_SIZE - sizeof(dump_t)) & ~0xFFFul) // dump offset must be aligned to lower 4kb sector boundary
#define MMU_BOOTLOADER_UPDATE_OFFSET (DUMP_OFFSET - 32768) // 32KB of MMU bootloader self update.
#define MMU_FW_UPDATE_OFFSET (MMU_BOOTLOADER_UPDATE_OFFSET - 32768) // 32KB of MMU fw.
#define LANG_OFFSET 0x0 // offset for language data
 
#define LANG_SIZE (MMU_FW_UPDATE_OFFSET - LANG_OFFSET) // available language space
#define DUMP_SIZE (XFLASH_SIZE - DUMP_OFFSET) // effective dump size area