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FreeRTOS 8.2.1 for MIPS32 processor cores

Qais Yousef

October 21, 2015 15:52

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FreeRTOS-8.2.1-mips32-21Oct2015.zip
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This port provides support for MIPS32 cores.


Requirements:

This port is dependent on features provided by Codescape SDK.
To get the latest version visit the following website:

   http://community.imgtec.com/developers/mips/tools/codescape-mips-sdk/download-codescape-mips-sdk-essentials/

You must use SDK v1.3 or higher.

Or if you're just installing the tools on their own, it must be v2015.06-xx
or higher.

You will also need FreeRTOS-8.2.1 official release which this release must be extracted on top of.


Features:
   * Vectored interrupt, GIC and EIC support.
   * Count/Compare register based internal timer support.
   * DSP and FPU context switching.
   * microMips support.
   * Cold boot support


New Changes:
   * The new SDK has a Hardware Abstraction Layer (HAL) that implements the
     Unified Hosting Interface (UHI) and compiler support for creating
     interrupt handlers.

   * Global Interrupt Controller (GIC) support.
     GIC allows more interrupts to be connected to the core.

   * Experimental External Interrupt Controller (EIC) support.
     EIC mode transforms the 6 core interrupt lines into 64 priority
     encoded ones.
     This could be provided by GIC or some other external interrupt
     controller.
     This received very little testing, so use with caution.

   * Baseline interrupt support was removed since the toolchain
     doesn't have instrinsic support for it.
     Vectored interrupt is the norm on all new cores.

   * DSP and FPU context switching support.

   * Can't mix MIPS32 and microMips exception handling anymore.

   * Now you can make FreeRTOS romable by including boot code in the binary.
     The boot code can either be combined in the same binary as FreeRTOS
     or built separately as a first stage bootloader.

     The support for this is dependent on the SDK which provides generic support for
     cold boot. If you're interested in this feature you might want to consult the
     documentation installed with the SDK.

     Note that the boot code in the SDK has a different licence to the FreeRTOS.
     Consult the SDK documentation for more info.

   * New config based build system.
     You can rebuild the system for various configurations by applying
     different config files instead of passing command line arguments.
     To apply a config file

       make -C FreeRTOS/Demo/MIPS32_GCC/ myconfigfile

    config files must be in FreeRTOS/Demo/MIPS32_GCC/configs


Building the Demo:
   * make -C FreeRTOS/Demo/MIPS32_GCC/ defaultconfig
   * make -C FreeRTOS/Demo/MIPS32_GCC/

NOTE: The compiler must be in your path. You'll need mips-mti-elf- toolchain
for mips32r2-r5 targets and mips-img-elf- for mips32r6 targets.

FreeRTOS-8.2.1-mips32-21Oct2015.zip

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4 comments

• 0
  
  Mutahir Latif November 05, 2015 10:36

  I am trying to compile this port for MIPS32. I have the free Codescape toolchain from IMGTEC, but I am getting an error during compilation:

  ----------------------------------------

  mips-mti-elf-gcc -c -EL -msoft-float -DCONFIG_NO_GIC_EIC -march=mips32r5 -g -I. -I./include -I../../Source/include -I../../Source/portable/GCC/MIPS32 -I../Common/include -DCONFIG_CPU_CLOCK_HZ=400000000 -DCONFIG_STACK_SIZE=512 -DCONFIG_HEAP_SIZE=16*1024 -DCONFIG_MAX_PRIORITIES=5 ../../Source/portable/GCC/MIPS32/port.c -o build/port.o
  ../../Source/portable/GCC/MIPS32/port.c:70:22: fatal error: mips/hal.h: No such file or directory
  #include <mips/hal.h>
  ^
  compilation terminated.
  make: *** [build/port.o] Error 1

  ---------------------

  I am unable to locate the file mips/hal.h where can I find it?

• 0
  
  Qais Yousef November 09, 2015 09:53

  This error means you're definitely on the wrong toolchain. You must download MTI Bare Metal toolchain. When you check the version with mips-mti-elf-gcc -v it should show 2016.06-xx.

  If you downloaded the correct one, make sure you update your path to the location where you untarred the new toolchain.

• 0
  
  Mutahir Latif November 10, 2015 05:20

  Thank you for the help. The new SDK solved the problem. 

• 0
  
  Colin Marriott January 15, 2016 13:53

  FreeRTOS port for MIPS32 processor cores

  Colin Marriott January 15, 2016

  --------------------------------------------------------
  freertos-mips32.zip
  --------------------------------------------------------
  
  This port provides support for MIPS32 cores.
  
  
  Requirements:
  
  This port is dependent on features provided by Codescape SDK.
  To get the latest version visit the following website:
  
     http://community.imgtec.com/developers/mips/tools/codescape-mips-sd...
  
  You must use SDK v1.3 or higher.
  
  Or if you're just installing the tools on their own, it must be v2015.06-xx
  or higher.
  
  You will also need FreeRTOS-8.2.1 official release which this release must be extracted on top of.
  
  
  Features:
     * Fixes to the context save and restore.
     * A demo using lwIP 1.4.1.
     * Non EIC vectored interrupt helper functions.
  
  New Changes:
     * Fixes to the context save and restore.
       Previously, the DSP and FPU contexts overwrote the normal context when saved.
  
     * Non EIC support.
       Helper functions added to setup interrupts for non EIC vectored interrupts
  
     * New demo added.
       A demo using the ci40 mips board from Imagination Technologies Ltd has been added utilizing the Ethernet, Uart and inter-processor interrupts.

  
  Building the Demo(for a ci40 board):
     * ARCH=interaptiv INTS=eic GIC_BASE_ADDRESS=0x1BDC0000 make
  
  NOTE: The compiler must be in your path. You'll need mips-mti-elf- toolchain
  for mips32r2-r5 targets and mips-img-elf- for mips32r6 targets.