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unneback |
RedBoot for the Samsung CalmRISC16 core evaluation board
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May 7th 2001
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README
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========================================================================
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This ReadMe contains instructions for running Redboot on the Samsung
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calmRISC16 core evaluation board, and building RedBoot and ecosconfig.
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You will need the GNUPro calmrisc16-elf toolchain which should be
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installed in /usr/cygnus.
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Overview
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--------
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This implementation of RedBoot supports the calmRISC16 core evaluation board.
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The core board has no communication channel and requires an MDSChip board to
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provide a serial channel for host communication. The calmRISC16 is a harvard
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architecture with separate 22-bit program and data addresses. The instruction
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set provides no instruction for writing to program memory. The MDSChip board
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firmware (called CalmBreaker) provides a pseudo register interface so that
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code running on the core has access to a serial channel and a mechanism to
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write to program memory. The serial channel is fixed at 57600-8-N-1 by the
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firmware. The CalmBreaker firmware also provides a serial protocol which
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allows a host to download a program and to start or stop the core board.
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Downloading and running RedBoot
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--------------------------------
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All storage on the core board is volatile, so RedBoot must be downloaded to
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the board after every power cycle. Downloads require the use of a utility
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program. The source file and build instructions for this utility are provided
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in the RedBoot sources at:
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.../packages/hal/calmrisc16/ceb/current/support
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To download the RedBoot image, first press the reset button on the MDSChip
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board. The green 'Run' LED on the core board should go off. Now, use the
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utility to download the RedBoot image with:
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% calmbreaker -p /dev/term/b --reset --srec-code -f redboot.elf
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Note that the '-p /dev/term/b' specifies the serial port to use and will vary
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from system to syetm. The download will take about two minutes. After it
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finishes, start RedBoot with:
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% calmbreaker -p /dev/term/b --run
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The 'Run' LED on the core board should be on. Connecting to the MDSboard with
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a terminal and typing enter should result in RedBoot reprinting the command
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prompt.
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Rebuilding RedBoot
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------------------
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Assuming that the provided RedBoot source tree is located in the current
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directory, the build process is:
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% export TOPDIR=`pwd`
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% export ECOS_REPOSITORY=${TOPDIR}/packages
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% mkdir ${TOPDIR}/build
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% cd ${TOPDIR}/build
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% ecosconfig new calm16_ceb redboot
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% ecosconfig import ${ECOS_REPOSITORY}/hal/calmrisc16/current/misc/redboot_ROM.ecm
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% ecosconfig tree
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% make
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Building ecosconfig
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-------------------
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An ecosconfig binary is supplied in the bin directory, but you may wish
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to build it from source.
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Detailed instructions for building the command-line tool ecosconfig
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can be found in host/README. For example:
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mkdir $TEMP/redboot-build
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cd $TEMP/redboot-build
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$TOPDIR/host/configure --prefix=$TEMP/redboot-build --with-tcl=/usr
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make
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