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1 | Overview: |
2 | ========= | |
3 | ||
4 | The MPC8536E integrates a PowerPC processor core with system logic | |
5 | required for imaging, networking, and communications applications. | |
6 | ||
7 | Boot from NAND: | |
8 | =============== | |
9 | ||
10 | The MPC8536E is capable of booting from NAND flash which uses the image | |
11 | u-boot-nand.bin. This image contains two parts: a first stage image(also | |
12 | call 4K NAND loader and a second stage image. The former is appended to | |
13 | the latter to produce u-boot-nand.bin. | |
14 | ||
15 | The bootup process can be divided into two stages: the first stage will | |
16 | configure the L2SRAM, then copy the second stage image to L2SRAM and jump | |
17 | to it. The second stage image is to configure all the hardware and boot up | |
18 | to U-Boot command line. | |
19 | ||
20 | The 4K NAND loader's code comes from the corresponding nand_spl directory, | |
21 | along with the code twisted by CONFIG_NAND_SPL. The macro CONFIG_NAND_SPL | |
22 | is mainly used to shrink the code size to the 4K size limitation. | |
23 | ||
24 | The macro CONFIG_SYS_RAMBOOT is used to control the code to produce the | |
25 | second stage image. It's set in the board config file when boot from NAND | |
26 | is selected. | |
27 | ||
28 | Build and boot steps | |
29 | -------------------- | |
30 | ||
31 | 1. Building image | |
32 | make MPC8536DS_NAND_config | |
33 | make CROSS_COMPILE=powerpc-none-linux-gnuspe- all | |
34 | ||
35 | 2. Change dip-switch | |
36 | SW2[5-8] = 1011 | |
37 | SW9[1-3] = 101 | |
38 | Note: 1 stands for 'on', 0 stands for 'off' | |
39 | ||
40 | 3. Flash image | |
41 | tftp 1000000 u-boot-nand.bin | |
42 | nand erase 0 a0000 | |
43 | nand write 1000000 0 a0000 | |
44 | ||
45 | Boot from On-chip ROM: | |
46 | ====================== | |
47 | ||
48 | The MPC8536E is capable of booting from the on-chip ROM - boot from eSDHC | |
49 | and boot from eSPI. When power on, the porcessor excutes the ROM code to | |
50 | initialize the eSPI/eSDHC controller, and loads the mian U-Boot image from | |
51 | the memory device that interfaced to the controller, such as the SDCard or | |
52 | SPI EEPROM, to the target memory, e.g. SDRAM or L2SRAM, then boot from it. | |
53 | ||
54 | The memory device should contain a specific data structure with control word | |
55 | and config word at the fixed address. The config word direct the process how | |
56 | to config the memory device, and the control word direct the processor where | |
57 | to find the image on the memory device, or where copy the main image to. The | |
58 | user can use any method to store the data structure to the memory device, only | |
59 | if store it on the assigned address. | |
60 | ||
61 | Build and boot steps | |
62 | -------------------- | |
63 | ||
64 | For boot from eSDHC: | |
65 | 1. Build image | |
66 | make MPC8536DS_SDCARD_config | |
67 | make CROSS_COMPILE=powerpc-none-linux-gnuspe- all | |
68 | ||
69 | 2. Change dip-switch | |
70 | SW2[5-8] = 0111 | |
71 | SW3[1] = 0 | |
72 | SW8[7] = 0 - The on-board SD/MMC slot is active | |
73 | SW8[7] = 1 - The externel SD/MMC slot is active | |
74 | ||
75 | 3. Put image to SDCard | |
76 | Put the follwing info at the assigned address on the SDCard: | |
77 | ||
78 | Offset | Data | Description | |
79 | -------------------------------------------------------- | |
80 | | 0x40-0x43 | 0x424F4F54 | BOOT signature | | |
81 | -------------------------------------------------------- | |
82 | | 0x48-0x4B | 0x00080000 | u-boot.bin's size | | |
83 | -------------------------------------------------------- | |
84 | | 0x50-0x53 | 0x???????? | u-boot.bin's Addr on SDCard | | |
85 | -------------------------------------------------------- | |
86 | | 0x58-0x5B | 0xF8F80000 | Target Address | | |
87 | ------------------------------------------------------- | |
88 | | 0x60-0x63 | 0xF8FFF000 | Execution Starting Address | | |
89 | -------------------------------------------------------- | |
90 | | 0x68-0x6B | 0x6 | Number of Config Addr/Data | | |
91 | -------------------------------------------------------- | |
92 | | 0x80-0x83 | 0xFF720100 | Config Addr 1 | | |
93 | | 0x84-0x87 | 0xF8F80000 | Config Data 1 | | |
94 | -------------------------------------------------------- | |
95 | | 0x88-0x8b | 0xFF720e44 | Config Addr 2 | | |
96 | | 0x8c-0x8f | 0x0000000C | Config Data 2 | | |
97 | -------------------------------------------------------- | |
98 | | 0x90-0x93 | 0xFF720000 | Config Addr 3 | | |
99 | | 0x94-0x97 | 0x80010000 | Config Data 3 | | |
100 | -------------------------------------------------------- | |
101 | | 0x98-0x9b | 0xFF72e40e | Config Addr 4 | | |
102 | | 0x9c-0x9f | 0x00000040 | Config Data 4 | | |
103 | -------------------------------------------------------- | |
104 | | 0xa0-0xa3 | 0x40000001 | Config Addr 5 | | |
105 | | 0xa4-0xa7 | 0x00000100 | Config Data 5 | | |
106 | -------------------------------------------------------- | |
107 | | 0xa8-0xab | 0x80000001 | Config Addr 6 | | |
108 | | 0xac-0xaf | 0x80000001 | Config Data 6 | | |
109 | -------------------------------------------------------- | |
110 | | ...... | | |
111 | -------------------------------------------------------- | |
112 | | 0x???????? | u-boot.bin | | |
113 | -------------------------------------------------------- | |
114 | ||
115 | then insert the SDCard to the active slot to boot up. | |
116 | ||
117 | For boot from eSPI: | |
118 | 1. Build image | |
119 | make MPC8536DS_SPIFLASH_config | |
120 | make CROSS_COMPILE=powerpc-none-linux-gnuspe- all | |
121 | ||
122 | 2. Change dip-switch | |
123 | SW2[5-8] = 0110 | |
124 | ||
125 | 3. Put image to SPI flash | |
126 | Put the info in the above table onto the SPI flash, then | |
127 | boot up. |