UU-boot和kernel的传参

bd_info

```u-boot.h

1. typedefstruct bd_info {
2. int bi_baudrate;/* serial console baudrate */
3. unsignedlong bi_ip_addr;/* IP Address */
4. struct environment_s *bi_env;
5. ulong bi_arch_number;/* unique id for this board */
6. ulong bi_boot_params;/* where this board expects params */
7. struct/* RAM configuration */
8. {
9. ulong start;
10. ulong size;
11. } bi_dram[CONFIG_NR_DRAM_BANKS];
12. }bd_t;
14. #define bi_env_data bi_env->data
15. #define bi_env_crc bi_env->crc

```