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diff --git a/doc/README.m68k b/doc/README.m68k new file mode 100644 index 0000000..9385f44 --- /dev/null +++ b/doc/README.m68k @@ -0,0 +1,133 @@ + +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> |