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    U-Boot for Motorola M68K
    
    
    ====================================================================
    History
    
    
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    August 08,2005;		Jens Scharsig <esw@bus-elektronik.de>
    
    			MCF5282 implementation without preloader
    
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    January 12, 2004;	<josef.baumgartner@telex.de>
    
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    ====================================================================
    
    This file contains status information for the port of U-Boot to the
    Motorola M68K series of CPUs.
    
    1. OVERVIEW
    -----------
    Bernhard Kuhn ported U-Boot 0.4.0 to the Motorola Coldfire
    architecture. The patches of Bernhard support the MCF5272 and
    MCF5282. A great disadvantage of these patches was that they needed
    a pre-bootloader to start u-boot. Because of this, a new port was
    created which no longer needs a first stage booter.
    
    Although this port is intended to cover all M68k processors, only
    the parts for the Motorola Coldfire MCF5272 and MCF5282 are
    implemented at the moment. Additional CPUs and boards will be
    hopefully added soon!
    
    
    2. SUPPORTED CPUs
    -----------------
    
    2.1 Motorola Coldfire MCF5272
    -----------------------------
    CPU specific code is located in: cpu/mcf52x2
    
    
    2.1 Motorola Coldfire MCF5282
    -----------------------------
    CPU specific code is located in: cpu/mcf52x2
    
    
    The MCF5282 Port no longer needs a preloader and can place in external or
    internal FLASH.
    
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    3. SUPPORTED BOARDs
    -------------------
    
    3.1 Motorola M5272C3 EVB
    ------------------------
    Board specific code is located in: board/m5272c3
    
    To configure the board, type: make M5272C3_config
    
    U-Boot Memory Map:
    ------------------
    0xffe00000 - 0xffe3ffff		u-boot
    0xffe04000 - 0xffe05fff		environment (embedded in u-boot!)
    0xffe40000 - 0xffffffff		free for linux/applications
    
    
    3.2 Motorola M5282 EVB
    ------------------------
    Board specific code is located in: board/m5282evb
    
    To configure the board, type: make M5272C3_config
    
    
    At the moment the code isn't fully implemented and still needs a pre-loader!
    The preloader must initialize the processor and then start u-boot. The board
    must be configured for a pre-loader (see 4.1)
    
    For the preloader, please see
    http://mailman.uclinux.org/pipermail/uclinux-dev/2003-December/023384.html
    
    U-boot is configured to run at 0x20000 at default. This can be configured by
    change TEXT_BASE in board/m5282evb/config.mk and CFG_MONITOR_BASE in
    include/configs/M5282EVB.h.
    
    3.2 BuS EB+MCF-EV123
    ---------------------
    
    Board specific code is located in: board/bus/EB+MCF-EV123
    
    To configure the board, type:
    
    
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    make EB+MCF-EV123_config		for external FLASH
    make EB+MCF-EV123_internal_config	for internal FLASH
    
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    4. CONFIGURATION OPTIONS/SETTINGS
    ----------------------------------
    
    4.1 Configuration to use a pre-loader
    -------------------------------------
    If u-boot should be loaded to RAM and started by a pre-loader
    CONFIG_MONITOR_IS_IN_RAM must be defined. If it is defined the
    initial vector table and basic processor initialization will not
    be compiled in. The start address of u-boot must be adjusted in
    the boards config header file (CFG_MONITOR_BASE) and Makefile
    (TEXT_BASE) to the load address.
    
    4.1 MCF5272 specific Options/Settings
    -------------------------------------
    
    CONFIG_MCF52x2	-- defined for all MCF52x2 CPUs
    CONFIG_M5272	-- defined for all Motorola MCF5272 CPUs
    
    CONFIG_MONITOR_IS_IN_RAM
    		-- defined if u-boot is loaded by a pre-loader
    
    CFG_MBAR	-- defines the base address of the MCF5272 configuration registers
    CFG_INIT_RAM_ADDR
    		-- defines the base address of the MCF5272 internal SRAM
    CFG_ENET_BD_BASE
    		-- defines the base addres of the FEC buffer descriptors
    
    CFG_SCR		-- defines the contents of the System Configuration Register
    CFG_SPR		-- defines the contents of the System Protection Register
    CFG_BRx_PRELIM	-- defines the contents of the Chip Select Base Registers
    CFG_ORx_PRELIM	-- defines the contents of the Chip Select Option Registers
    
    CFG_PxDDR	-- defines the contents of the Data Direction Registers
    CFG_PxDAT	-- defines the contents of the Data Registers
    CFG_PXCNT	-- defines the contents of the Port Configuration Registers
    
    
    4.2 MCF5282 specific Options/Settings
    -------------------------------------
    
    CONFIG_MCF52x2	-- defined for all MCF52x2 CPUs
    CONFIG_M5282	-- defined for all Motorola MCF5282 CPUs
    
    CONFIG_MONITOR_IS_IN_RAM
    		-- defined if u-boot is loaded by a pre-loader
    
    CFG_MBAR	-- defines the base address of the MCF5282 internal register space
    CFG_INIT_RAM_ADDR
    		-- defines the base address of the MCF5282 internal SRAM
    CFG_INT_FLASH_BASE
    		-- defines the base address of the MCF5282 internal Flash memory
    CFG_ENET_BD_BASE
    		-- defines the base addres of the FEC buffer descriptors
    
    
    CFG_MFD
    		-- defines the PLL Multiplication Factor Devider
    		   (see table 9-4 of MCF user manual)
    CFG_RFD		-- defines the PLL Reduce Frecuency Devider
    		   (see table 9-4 of MCF user manual)
    
    CFG_CSx_BASE	-- defines the base address of chip select x
    CFG_CSx_SIZE	-- defines the memory size (address range) of chip select x
    CFG_CSx_WIDTH	-- defines the bus with of chip select x
    
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    CFG_CSx_RO	-- if set to 0 chip select x is read/wirte
    
    			else chipselct is read only
    CFG_CSx_WS	-- defines the number of wait states  of chip select x
    
    CFG_PxDDR	-- defines the contents of the Data Direction Registers
    CFG_PxDAT	-- defines the contents of the Data Registers
    CFG_PXCNT	-- defines the contents of the Port Configuration Registers
    
    CFG_PxPAR	-- defines the function of ports
    
    
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    5. COMPILER
    -----------
    To create U-Boot the gcc-2.95.3 compiler set (m68k-elf-20030314) from uClinux.org was used.
    You can download it from: http://www.uclinux.org/pub/uClinux/m68k-elf-tools/