mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-14 15:23:07 +00:00
702e6014f1
Also drop a few files referring to no longer / not yet supported boards. Signed-off-by: Wolfgang Denk <wd@denx.de> Cc: Prafulla Wadaskar <prafulla@marvell.com> Cc: Stefan Roese <sr@denx.de> Cc: Kim Phillips <kim.phillips@freescale.com> Cc: Andy Fleming <afleming@gmail.com> Cc: Jason Jin <jason.jin@freescale.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com> Acked-by: Stefano Babic <sbabic@denx.de> Acked-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
127 lines
4.9 KiB
Text
127 lines
4.9 KiB
Text
Overview:
|
|
=========
|
|
|
|
The MPC8536E integrates a PowerPC processor core with system logic
|
|
required for imaging, networking, and communications applications.
|
|
|
|
Boot from NAND:
|
|
===============
|
|
|
|
The MPC8536E is capable of booting from NAND flash which uses the image
|
|
u-boot-nand.bin. This image contains two parts: a first stage image(also
|
|
call 4K NAND loader and a second stage image. The former is appended to
|
|
the latter to produce u-boot-nand.bin.
|
|
|
|
The bootup process can be divided into two stages: the first stage will
|
|
configure the L2SRAM, then copy the second stage image to L2SRAM and jump
|
|
to it. The second stage image is to configure all the hardware and boot up
|
|
to U-Boot command line.
|
|
|
|
The 4K NAND loader's code comes from the corresponding nand_spl directory,
|
|
along with the code twisted by CONFIG_NAND_SPL. The macro CONFIG_NAND_SPL
|
|
is mainly used to shrink the code size to the 4K size limitation.
|
|
|
|
The macro CONFIG_SYS_RAMBOOT is used to control the code to produce the
|
|
second stage image. It's set in the board config file when boot from NAND
|
|
is selected.
|
|
|
|
Build and boot steps
|
|
--------------------
|
|
|
|
1. Building image
|
|
make MPC8536DS_NAND_config
|
|
make CROSS_COMPILE=powerpc-none-linux-gnuspe- all
|
|
|
|
2. Change dip-switch
|
|
SW2[5-8] = 1011
|
|
SW9[1-3] = 101
|
|
Note: 1 stands for 'on', 0 stands for 'off'
|
|
|
|
3. Flash image
|
|
tftp 1000000 u-boot-nand.bin
|
|
nand erase 0 a0000
|
|
nand write 1000000 0 a0000
|
|
|
|
Boot from On-chip ROM:
|
|
======================
|
|
|
|
The MPC8536E is capable of booting from the on-chip ROM - boot from eSDHC
|
|
and boot from eSPI. When power on, the porcessor excutes the ROM code to
|
|
initialize the eSPI/eSDHC controller, and loads the mian U-Boot image from
|
|
the memory device that interfaced to the controller, such as the SDCard or
|
|
SPI EEPROM, to the target memory, e.g. SDRAM or L2SRAM, then boot from it.
|
|
|
|
The memory device should contain a specific data structure with control word
|
|
and config word at the fixed address. The config word direct the process how
|
|
to config the memory device, and the control word direct the processor where
|
|
to find the image on the memory device, or where copy the main image to. The
|
|
user can use any method to store the data structure to the memory device, only
|
|
if store it on the assigned address.
|
|
|
|
Build and boot steps
|
|
--------------------
|
|
|
|
For boot from eSDHC:
|
|
1. Build image
|
|
make MPC8536DS_SDCARD_config
|
|
make CROSS_COMPILE=powerpc-none-linux-gnuspe- all
|
|
|
|
2. Change dip-switch
|
|
SW2[5-8] = 0111
|
|
SW3[1] = 0
|
|
SW8[7] = 0 - The on-board SD/MMC slot is active
|
|
SW8[7] = 1 - The externel SD/MMC slot is active
|
|
|
|
3. Put image to SDCard
|
|
Put the follwing info at the assigned address on the SDCard:
|
|
|
|
Offset | Data | Description
|
|
--------------------------------------------------------
|
|
| 0x40-0x43 | 0x424F4F54 | BOOT signature |
|
|
--------------------------------------------------------
|
|
| 0x48-0x4B | 0x00080000 | u-boot.bin's size |
|
|
--------------------------------------------------------
|
|
| 0x50-0x53 | 0x???????? | u-boot.bin's Addr on SDCard |
|
|
--------------------------------------------------------
|
|
| 0x58-0x5B | 0xF8F80000 | Target Address |
|
|
-------------------------------------------------------
|
|
| 0x60-0x63 | 0xF8FFF000 | Execution Starting Address |
|
|
--------------------------------------------------------
|
|
| 0x68-0x6B | 0x6 | Number of Config Addr/Data |
|
|
--------------------------------------------------------
|
|
| 0x80-0x83 | 0xFF720100 | Config Addr 1 |
|
|
| 0x84-0x87 | 0xF8F80000 | Config Data 1 |
|
|
--------------------------------------------------------
|
|
| 0x88-0x8b | 0xFF720e44 | Config Addr 2 |
|
|
| 0x8c-0x8f | 0x0000000C | Config Data 2 |
|
|
--------------------------------------------------------
|
|
| 0x90-0x93 | 0xFF720000 | Config Addr 3 |
|
|
| 0x94-0x97 | 0x80010000 | Config Data 3 |
|
|
--------------------------------------------------------
|
|
| 0x98-0x9b | 0xFF72e40c | Config Addr 4 |
|
|
| 0x9c-0x9f | 0x00000040 | Config Data 4 |
|
|
--------------------------------------------------------
|
|
| 0xa0-0xa3 | 0x40000001 | Config Addr 5 |
|
|
| 0xa4-0xa7 | 0x00000100 | Config Data 5 |
|
|
--------------------------------------------------------
|
|
| 0xa8-0xab | 0x80000001 | Config Addr 6 |
|
|
| 0xac-0xaf | 0x80000001 | Config Data 6 |
|
|
--------------------------------------------------------
|
|
| ...... |
|
|
--------------------------------------------------------
|
|
| 0x???????? | u-boot.bin |
|
|
--------------------------------------------------------
|
|
|
|
then insert the SDCard to the active slot to boot up.
|
|
|
|
For boot from eSPI:
|
|
1. Build image
|
|
make MPC8536DS_SPIFLASH_config
|
|
make CROSS_COMPILE=powerpc-none-linux-gnuspe- all
|
|
|
|
2. Change dip-switch
|
|
SW2[5-8] = 0110
|
|
|
|
3. Put image to SPI flash
|
|
Put the info in the above table onto the SPI flash, then
|
|
boot up.
|