-U-Boot for Motorola M68K
+U-Boot for Motorola (or Freescale/NXP) ColdFire processors
-====================================================================
+===============================================================================
History
-August 08,2005; Jens Scharsig <esw@bus-elektronik.de>
+November 02, 2017 Angelo Dureghello <angelo@sysam.it>
+August 08, 2005 Jens Scharsig <esw@bus-elektronik.de>
MCF5282 implementation without preloader
-January 12, 2004; <josef.baumgartner@telex.de>
-====================================================================
+January 12, 2004 <josef.baumgartner@telex.de>
+===============================================================================
+
This file contains status information for the port of U-Boot to the
-Motorola M68K series of CPUs.
+Motorola ColdFire series of CPUs.
+
+
+1. Overview
-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.
+The ColdFire instruction set is "assembly source" compatible but an evolution
+of the original 68000 instruction set. Some not much used instructions has
+been removed. The instructions are only 16, 32, or 48 bits long, a
+simplification compared to the 68000 series.
-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!
+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.
+Thanks mainly to Freescale but also to several other contributors, U-Boot now
+supports nearly the entire range of ColdFire processors and their related
+development boards.
-2. SUPPORTED CPUs
------------------
-2.1 Motorola Coldfire MCF5272
------------------------------
-CPU specific code is located in: arch/m68k/cpu/mcf52x2
+2. Supported CPU families
+Please "make menuconfig" with ARCH=m68k, or check arch/m68k/cpu to see the
+currently supported processor and families.
-2.1 Motorola Coldfire MCF5282
------------------------------
-CPU specific code is located in: arch/m68k/cpu/mcf52x2
-The MCF5282 Port no longer needs a preloader and can place in external or
-internal FLASH.
+3. Supported boards
+U-Boot supports actually more than 40 ColdFire based boards.
+Board configuration can be done trough include/configs/<boardname>.h but the
+current recommended method is to use the new and more friendly approach as
+the "make menuconfig" way, very similar to the Linux way.
-3. SUPPORTED BOARDs
--------------------
+To know details as memory map, build targets, default setup, etc, of a
+specific board please check:
-3.1 Motorola M5272C3 EVB
-------------------------
-Board specific code is located in: board/m5272c3
+include/configs/<boardname>.h
+and/or
+configs/<boardname>_defconfig
-To configure the board, type: make M5272C3_config
+It is possible to build all ColdFire boards in a single command-line command,
+from u-boot root directory, as:
-U-Boot Memory Map:
-------------------
-0xffe00000 - 0xffe3ffff U-Boot
-0xffe04000 - 0xffe05fff environment (embedded in U-Boot!)
-0xffe40000 - 0xffffffff free for linux/applications
+./tools/buildman/buildman m68k
-3.2 Motorola M5282 EVB
-------------------------
-Board specific code is located in: board/m5282evb
+3.1. Build U-Boot for a specific board
-To configure the board, type: make M5272C3_config
+A bash script similar to the one below may be used:
-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)
+#!/bin/bash
-For the preloader, please see
-http://mailman.uclinux.org/pipermail/uclinux-dev/2003-December/023384.html
+export CROSS_COMPILE=/opt/toolchains/m68k/gcc-4.9.0-nolibc/bin/m68k-linux-
-U-Boot is configured to run at 0x20000 at default. This can be configured by
-change CONFIG_SYS_TEXT_BASE in board/m5282evb/config.mk and CONFIG_SYS_MONITOR_BASE in
-include/configs/M5282EVB.h.
+board=M5475DFE
-3.2 BuS EB+MCF-EV123
----------------------
+make distclean
+make ARCH=m68k ${board}_defconfig
+make ARCH=m68k KBUILD_VERBOSE=1
-Board specific code is located in: board/bus/EB+MCF-EV123
-To configure the board, type:
+4. Adopted toolchains
-make EB+MCF-EV123_config for external FLASH
-make EB+MCF-EV123_internal_config for internal FLASH
+Please check:
+https://www.denx.de/wiki/U-Boot/ColdFireNotes
-4. CONFIGURATION OPTIONS/SETTINGS
-----------------------------------
+5. ColdFire specific configuration options/settings
+
+
+5.1. Configuration to use a pre-loader
-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
the boards config header file (CONFIG_SYS_MONITOR_BASE) and Makefile
(CONFIG_SYS_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
-
-CONFIG_SYS_MBAR -- defines the base address of the MCF5272 configuration registers
-CONFIG_SYS_INIT_RAM_ADDR
- -- defines the base address of the MCF5272 internal SRAM
-CONFIG_SYS_ENET_BD_BASE
- -- defines the base address of the FEC buffer descriptors
+5.2 ColdFire CPU specific options/settings
-CONFIG_SYS_SCR -- defines the contents of the System Configuration Register
-CONFIG_SYS_SPR -- defines the contents of the System Protection Register
-CONFIG_SYS_BRx_PRELIM -- defines the contents of the Chip Select Base Registers
-CONFIG_SYS_ORx_PRELIM -- defines the contents of the Chip Select Option Registers
-
-CONFIG_SYS_PxDDR -- defines the contents of the Data Direction Registers
-CONFIG_SYS_PxDAT -- defines the contents of the Data Registers
-CONFIG_SYS_PXCNT -- defines the contents of the Port Configuration Registers
-
-
-4.2 MCF5282 specific Options/Settings
--------------------------------------
+To specify a CPU model, some defines shoudl be used, i.e.:
CONFIG_MCF52x2 -- defined for all MCF52x2 CPUs
-CONFIG_M5282 -- defined for all Motorola MCF5282 CPUs
+CONFIG_M5272 -- defined for all Motorola MCF5272 CPUs
-CONFIG_MONITOR_IS_IN_RAM
- -- defined if U-Boot is loaded by a pre-loader
+Other options, generally set inside include/configs/<boardname>.h, they may
+apply to one or more cpu for the ColdFire family:
-CONFIG_SYS_MBAR -- defines the base address of the MCF5282 internal register space
-CONFIG_SYS_INIT_RAM_ADDR
- -- defines the base address of the MCF5282 internal SRAM
-CONFIG_SYS_INT_FLASH_BASE
- -- defines the base address of the MCF5282 internal Flash memory
+CONFIG_SYS_MBAR -- defines the base address of the MCF5272 configuration
+ registers
CONFIG_SYS_ENET_BD_BASE
-- defines the base address of the FEC buffer descriptors
-
-CONFIG_SYS_MFD
- -- defines the PLL Multiplication Factor Devider
+CONFIG_SYS_SCR -- defines the contents of the System Configuration Register
+CONFIG_SYS_SPR -- defines the contents of the System Protection Register
+CONFIG_SYS_MFD -- defines the PLL Multiplication Factor Divider
(see table 9-4 of MCF user manual)
-CONFIG_SYS_RFD -- defines the PLL Reduce Frecuency Devider
+CONFIG_SYS_RFD -- defines the PLL Reduce Frequency Devider
(see table 9-4 of MCF user manual)
-
-CONFIG_SYS_CSx_BASE -- defines the base address of chip select x
-CONFIG_SYS_CSx_SIZE -- defines the memory size (address range) of chip select x
-CONFIG_SYS_CSx_WIDTH -- defines the bus with of chip select x
-CONFIG_SYS_CSx_RO -- if set to 0 chip select x is read/wirte
- else chipselct is read only
-CONFIG_SYS_CSx_WS -- defines the number of wait states of chip select x
-
-CONFIG_SYS_PxDDR -- defines the contents of the Data Direction Registers
-CONFIG_SYS_PxDAT -- defines the contents of the Data Registers
-CONFIG_SYS_PXCNT -- defines the contents of the Port Configuration Registers
-
-CONFIG_SYS_PxPAR -- defines the function of ports
-
-
-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/
+CONFIG_SYS_CSx_BASE
+ -- defines the base address of chip select x
+CONFIG_SYS_CSx_SIZE
+ -- defines the memory size (address range) of chip select x
+CONFIG_SYS_CSx_WIDTH
+ -- defines the bus with of chip select x
+CONFIG_SYS_CSx_MASK
+ -- defines the mask for the related chip select x
+CONFIG_SYS_CSx_RO
+ -- if set to 0 chip select x is read/write else chip select
+ is read only
+CONFIG_SYS_CSx_WS
+ -- defines the number of wait states of chip select x
+CONFIG_SYS_CACHE_ICACR
+CONFIG_SYS_CACHE_DCACR
+CONFIG_SYS_CACHE_ACRX
+ -- cache-related registers config
+CONFIG_SYS_SDRAM_BASE
+CONFIG_SYS_SDRAM_SIZE
+CONFIG_SYS_SDRAM_BASEX
+CONFIG_SYS_SDRAM_CFG1
+CONFIG_SYS_SDRAM_CFG2
+CONFIG_SYS_SDRAM_CTRL
+CONFIG_SYS_SDRAM_MODE
+CONFIG_SYS_SDRAM_EMOD
+ -- SDRAM config for SDRAM controller-specific registers, please
+ see arch/m68k/cpu/<specific_cpu>/start.S files to see how
+ these options are used.
+CONFIG_MCFUART
+ -- defines enabling of ColdFire UART driver
+CONFIG_SYS_UART_PORT
+ -- defines the UART port to be used (only a single UART can be
+ actually enabled)
+CONFIG_SYS_SBFHDR_SIZE
+ -- size of the prepended SBF header, if any
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