text: #ifndef SUN_NVRAM_H
  #define SUN_NVRAM_H
  
  /* Sun IDPROM structure at the end of NVRAM */
  /* from http://www.squirrel.com/squirrel/sun-nvram-hostid.faq.html */
  struct Sun_nvram {
      uint8_t type;       /* always 01 */
      uint8_t machine_id; /* first byte of host id (machine type) */
      uint8_t macaddr[6]; /* 6 byte ethernet address (first 3 bytes 08, 00, 20) */
      uint8_t date[4];    /* date of manufacture */
      uint8_t hostid[3];  /* remaining 3 bytes of host id (serial number) */
      uint8_t checksum;   /* bitwise xor of previous bytes */
  };
  
  static inline void
  Sun_init_header(struct Sun_nvram *header, const uint8_t *macaddr, int machine_id)
  {
      uint8_t tmp, *tmpptr;
      unsigned int i;
  
      header->type = 1;
      header->machine_id = machine_id & 0xff;
      memcpy(&header->macaddr, macaddr, 6);
      memcpy(&header->hostid , &macaddr[3], 3);
  
      /* Calculate checksum */
      tmp = 0;
      tmpptr = (uint8_t *)header;
      for (i = 0; i < 15; i++)
          tmp ^= tmpptr[i];
  
      header->checksum = tmp;
  }
  #endif /* SUN_NVRAM_H */
  