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                FREERTOS COLDFIRE MCF523x PORT with lwIP
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REQUIREMENTS
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============
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The FreeRTOS port is designed for the MCF523x processor where the hardware
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dependent part consists of the CPU and the peripherals used in this  port.
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This includes a programmable timer  (PIT)  for  the  preemptive  scheduler
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and a UART for the demo application.  The Coldfire specific part  includes
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the number and type of processor registers, the  stack  frame  layout  and
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the usage of a software interrupt (trap) for the yield call.
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The development environment used is  based  on  the  GNU  C  Compiler  for
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a m68k-elf target as well as the insight debugger with  some  patches  for
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the BDM interface[1].  GDB startup and linker scripts  are  supplied  with
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the demo for the M5235BCC evaluation kit from Freescale.
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 [1] ... BDM tools: http://sourceforge.net/projects/bdm/
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USAGE
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=====
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A makefile is supplied with the demo  application  and  a  binary  can  be
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produced by calling 'make all'.  A  special  target  'debug'  is  provided
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which executes the insight  debugger.   At  the  insight  debugger  prompt
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one should select the  appropriate  target  interface  (either  BDM/Direct
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or BDM/TCP)  and  should  download  the  application  to  the  development
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board.  It is important that the GDB  script  setup-and-load  is  executed
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prior to downloading to  initialize  the  SDRAM.   After  downloading  one
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should call the GDB function 'execute' and the PC  is  set  to  the  start
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of the executable.  Execution can  be  started  by  typing  'continue'  at
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the Insight console interface.
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After this  startup phase the  insight debugger should work as usual, i.e.
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no grayed out buttons, ...
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COMMON PROBLEMS
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===============
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Most of the problems have  their  origin  in  the  startup  scripts.   The
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following list should serve as  a  checklist  where  each  point  must  be
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satisfied for the port to work.
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 - The FreeRTOS port only works correctly in the supervisor mode.   There-
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   fore the Coldfire CPU must run in the supervisor mode.
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 - portVECTOR_TABLE does not point to the currently active  vector  table.
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   Please also note that the vector table must be in  RAM  such  that  the
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   FreeRTOS port can install a traphandler for the portYIELD() call.
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$Id: README.txt 2 2011-07-17 20:13:17Z filepang@gmail.com $
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MCF5235 + lwIP port - Copyright (c) 2006 Christian Walter.
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