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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 | 0xFF72e40c | 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.
    128