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diff --git a/doc/README.m68k b/doc/README.m68k deleted file mode 100644 index f867ca1fbb..0000000000 --- a/doc/README.m68k +++ /dev/null @@ -1,150 +0,0 @@ - -U-Boot for Motorola (or Freescale/NXP) ColdFire processors - -=============================================================================== -History - -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> -=============================================================================== - - -This file contains status information for the port of U-Boot to the -Motorola ColdFire series of CPUs. - - -1. Overview - -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. - -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 CPU families - -Please "make menuconfig" with ARCH=m68k, or check arch/m68k/cpu to see the -currently supported processor and families. - - -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. - -To know details as memory map, build targets, default setup, etc, of a -specific board please check: - -include/configs/<boardname>.h -and/or -configs/<boardname>_defconfig - -It is possible to build all ColdFire boards in a single command-line command, -from u-boot root directory, as: - -./tools/buildman/buildman m68k - - -3.1. Build U-Boot for a specific board - -A bash script similar to the one below may be used: - -#!/bin/bash - -export CROSS_COMPILE=/opt/toolchains/m68k/gcc-4.9.0-nolibc/bin/m68k-linux- - -board=M5475DFE - -make distclean -make ARCH=m68k ${board}_defconfig -make ARCH=m68k KBUILD_VERBOSE=1 - - -4. Adopted toolchains - -Please check: -https://www.denx.de/wiki/U-Boot/ColdFireNotes - - -5. ColdFire specific configuration options/settings - - -5.1. 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 (CONFIG_SYS_MONITOR_BASE) and Makefile -(CONFIG_SYS_TEXT_BASE) to the load address. - - -5.2 ColdFire CPU specific options/settings - -To specify a CPU model, some defines shoudl be used, i.e.: - -CONFIG_MCF52x2 -- defined for all MCF52x2 CPUs -CONFIG_M5272 -- defined for all Motorola MCF5272 CPUs - -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 MCF5272 configuration - registers -CONFIG_SYS_ENET_BD_BASE - -- defines the base address of the FEC buffer descriptors -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 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_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 |