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SPI NOR Flash
Flash offset

+--------------------------------------------------+
| 0x000000                                         |
|                     TPL                          |
|                                                  |
| +----------------------------------------------+ |
| | 0x0000                                       | |
| | _start                                       | |
| |                                              | |
| | b reset                                      | |
| | mtc0 ...                                     | |
| +----------------------------------------------+ |
|                                                  |
| +----------------------------------------------+ |
| | 0x0040                                       | |
| | TPL_INFO                                     | |
| |                                              | |
| | magic = TPL_INFO_MAGIC                       | |
| | size  = __image_copy_len                     | |
| +----------------------------------------------+ |
|                                                  |
| +----------------------------------------------+ |
| | 0x0200 ~ 0x04ff                              | |
| | MIPS Exception Vector                        | |
| +----------------------------------------------+ |
|                                                  |
| +----------------------------------------------+ |
| | 0x0500                                       | |
| | reset:                                       | |
| |                                              | |
| | TPL真正的初始化代码                          | |
| | DDR初始化等                                  | |
| | ...                                          | |
| +----------------------------------------------+ |
|                                                  |
| TPL结束位置 = tpli->size                        |
+--------------------------------------------------+

+--------------------------------------------------+
|                        |
| 64 Bytes                                        |
|                                                  |
| ih_magic                                        |
| ih_size                                         |
| ih_load = 0x80100000                            |
| ih_ep   = 0x80100000                            |
| ih_os                                           |
| ih_comp                                         |
| ...                                             |
+--------------------------------------------------+

+--------------------------------------------------+
| SPL Payload                                     |
|                                                  |
| u-boot-spl-ddr.bin                              |
|                                                  |
+--------------------------------------------------+

+--------------------------------------------------+
| U-Boot proper Legacy Image Header               |
| 64 Bytes                                        |
|                                                  |
| ih_magic                                        |
| ih_size                                         |
| ih_load = 0x80200000                            |
| ih_ep   = 0x80200000                            |
| ih_os = IH_OS_U_BOOT                            |
| ih_comp = IH_COMP_LZMA                          |
| ...                                             |
+--------------------------------------------------+

+--------------------------------------------------+
| U-Boot proper Payload                           |
|                                                  |
| 压缩后的 U-Boot                                 |
| u-boot.bin.lzma                                 |
|                                                  |
+--------------------------------------------------+