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- U-Boot for Motorola M68K
- Last Update: January 12, 2004
- ====================================================================
- 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
- 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)
- 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. 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
- 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
- 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/
- Regards,
- Josef
- <josef.baumgartner@telex.de>
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