Managment CPU

Managment CPU configures and manages various aspects of Metlino to operate correctly in MicroTCA crate. Its main tasks are:

  • communication with the MCH,

  • negotiating payload power,

  • enabling various on-board power supplies,

  • monitoring stability of on-board power supplies,

  • managing hotswap abilities,

  • supplying sensor information via IPMB.

Managment CPU boot

During boot Managment CPU performs several tasks:

  • configures CPU, UART from own FLASH

  • sets IO port directions

  • configures I2C switch base address for master ports - MMC, FPGA

  • communicates with MCH and asks for payload power if hotswap handle is inserted

  • enables power supplies in sequence described in power supply section


Configuration of CPU, UART does not affect any of LED indicators.

Compiling firmware

Source code of OpenMMC is located here.


Compiling under Linux using cmake toolchain is the preferred option. Clone or download git repository. Then:

mkdir build && cd build

Minimal Dockerfile which downloads and compiles firmware:

FROM ubuntu:20.04

RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
        DEBIAN_FRONTEND=noninteractive apt-get upgrade -y && \
        DEBIAN_FRONTEND=noninteractive apt-get install -y gcc-arm-none-eabi cmake git

RUN git clone && \
        cd openMMC && git checkout sayma-devel

ENV CC="arm-none-eabi-gcc"
ENV CXX="arm-none-eabi-g++"

RUN cd openMMC && mkdir build && cd build && \
        cmake ../ -DBOARD=metlino -DTARGET_CONTROLLER=LPC1776 -DCMAKE_BUILD_TYPE=Debug \

ENTRYPOINT ["/bin/bash"]

You can use it as a reference to configure your system for compilation.


Follow steps in MCUXpresso and substitute source repository.

Flashing firmware

Header flashing

The CPU can be upgraded by USB cable and NXP programmer (can be used other programmer but make sure that header shorts pins 3, 5, 9) using LPCXpresso/MCUXpresso, Flashmagic or any other software which can talk with NXP bootloader. The tested programmer is LPCLink V2. Flashing using programmer also allows to debug the CPU. Use openMMC.axf file for flashing with LPCXpresso/MCUXpresso.

  1. Disable power on Metlino

  2. Disconnect programmer from USB

  3. Connect ribbon cable


Connection of programmer to the board

  1. Enable power on Metlino

  2. Connect programmer to USB

  3. Flash

  4. Select LPC_LINK2

  5. Default flash driver = LPC177x_8x_407x_8x_256.cfx (select from file system), reset handling default, flash reset handling default

  1. Run

  2. Disconnect programmer from USB

  3. Disable power on Metlino

  4. Disconnect ribbon

USB flashing

SW2 switch can be used to enable ISP mode of managment processor. Enabling first and second switch allows to program the processor using USB. Enabling last switch allows to run the board outside of the crate. See Board overview for the location of the header (top view, call-out 16).

Run command arm-none-eabi-objcopy -I binary -O ihex /path/to/openMMC.bin /path/to/openMMC.hex

The CPU can be upgraded using USB and flashmagic software. This option only allows to flash IC, without any debug option.

Steps to flash using USB:

  • Set SW2 first and second switches to “ON” position on Metlino


Switch positions for USB programming

  • Set LPC1776

  • Select last serial port that appears after connecting Metlino via USB

  • Select baud 57600

  • Select enitre device for erase

  • Select hex file you generated earlier

  • Enable verify after programming

  • Press start


Flashmagic settings

  • Set SW2 switches to their original positions after flashing is done


Switch positions for normal operation

On linux tools such as mxli can be used to program Managment CPU.