File: README.COBRA5272
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Author: Florian Schlote for Sentec elektronik (linux@sentec-elektronik.de)
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Contents: This is the README of u-boot (Universal bootloader) for our
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COBRA5272 board.
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Version: v01.00
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Date: Tue Mar 30 00:28:33 CEST 2004
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License: This document is published under the GNU GPL
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______________________________________________________________________
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CHANGES
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040330 v01.00 Creation
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______________________________________________________________________
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CONFIGURING
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-----------
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1. Modify include/configs/cobra5272.h acc. to your prefs
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2. If necessary, modify board/cobra5272/config.mk (see below)
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3.
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> make cobra5272_config
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> make
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Please refer to u-boot README (general info, u-boot-x-x-x/README),
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to u-boot-x-x-x/doc/README.COBRA5272 and
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to the comments in u-boot-x-x-x/include/configs/cobra5272.h
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Configuring u-boot is done by commenting/uncommenting preprocessor defines.
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Default configuration is
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FLASH version (for further info see subsection below)
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link address 0xffe00000
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16 MB RAM
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network enabled
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no default IP address for target, host set, no MACaddress set
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bootdelay for autoboot 5 sec.
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autoboot disabled
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#-----------------------------------
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# u-boot FLASH version & RAM version
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#-----------------------------------
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The u-boot bootloader for Coldfire processors can be configured
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1. as a standalone bootloader residing in flash & relocating itself to RAM on
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startup automatically => "FLASH version"
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2. as a RAM version which will not load from flash automatically as it needs a
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prestage bootloader ("chainloading") & is running only from the RAM address it
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is linked to => "RAM version"
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This version may be very helpful when installing u-boot for the first time
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since it can be used to make available s. th. like a "bootstrap
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mechanism".
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How to build the different images:
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------------------------------
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Flash version
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------------------------------
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Compile u-boot
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in dir ./u-boot-x-x-x/
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please first check:
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in ./include/configs/cobra5272.h
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CONFIG_MONITOR_IS_IN_RAM has to be undefined, e. g. as follows:
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#if 0
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#define CONFIG_MONITOR_IS_IN_RAM
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/* define if monitor is started from a pre-loader */
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#endif
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=> u-boot as single bootloader starting from flash
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in board/cobra5272/config.mk CONFIG_SYS_TEXT_BASE should be
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CONFIG_SYS_TEXT_BASE = 0xffe00000
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=> linking address for u-boot as single bootloader stored in flash
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then:
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host> make cobra5272_config
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rm -f include/config.h include/config.mk
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Configuring for cobra5272 board...
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host> make
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[...]
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host> cp u-boot.bin /tftpboot/u-boot_flash.bin
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------------------------------
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RAM version
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------------------------------
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in dir ./u-boot-x-x-x/
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host> make distclean
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please modify the settings:
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in ./include/configs/cobra5272.h
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CONFIG_MONITOR_IS_IN_RAM now has to be defined, e. g. as follows:
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#if 1
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#define CONFIG_MONITOR_IS_IN_RAM
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/*define if monitor is started from a pre-loader */
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#endif
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=> u-boot as RAM version, chainloaded by another bootloader or using bdm cable
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in board/cobra5272/config.mk CONFIG_SYS_TEXT_BASE should be
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CONFIG_SYS_TEXT_BASE = 0x00020000
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=> target linking address for RAM
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then:
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host> make cobra5272_config
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rm -f include/config.h include/config.mk
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Configuring for cobra5272 board...
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host> make
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[...]
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host> cp u-boot.bin /tftpboot/u-boot_ram.bin
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----
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HINT
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----
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If the m68k-elf-toolchain & the m68k-bdm-gdb is installed you can run the RAM
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version by typing (in dir ./u-boot-x-x-x/)
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"board/cobra5272/bdm/load-cobra_uboot" ,
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in ./u-boot-x-x-x/ the RAM version u-boot (elf format) has to be available.
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