154 struct ndboot_packet {  struct
157 	u_int8_t ndboot_packet_op;  argument
160 	u_int8_t ndboot_packet_minor;  argument
163 	int8_t ndboot_packet_error;  argument
166 	int8_t ndboot_packet_disk_version;  argument
169 	int32_t ndboot_packet_sequence;  argument
172 	int32_t ndboot_packet_block_number;  argument
175 	int32_t ndboot_packet_byte_count;  argument
178 	int32_t ndboot_packet_residual_byte_count;  argument
181 	int32_t ndboot_packet_current_byte_offset;  argument
184 	int32_t ndboot_packet_current_byte_count;  argument