chargebyte's EEPROM Utilities

This repository contains some command line tools related for chargebyte's EEPROM on various chargebyte hardware platforms.

Tools included so far are:

• cb-dt-eeprom: This tool allows to create an image for the Device Tree EEPROM which is recommended for custom carrier boards and is also present on most chargebyte's own carrier boards.
• cb-eeprom: This tool reads and prints the EEPROM contents of chargebyte hardware in a shell-compatible format.

cb-eeprom checks the SOM EEPROM first and then the Mint/Doublemint EEPROM. The EEPROM paths can be overridden with --som-eeprom, --cb-eeprom, and --dt-eeprom; without these options the platform default paths are used. When a carrier-board EEPROM contains the default hardware revision, a valid hardware revision from the DT EEPROM is preferred. For example:

cb-eeprom
cb-eeprom som_pcb_dmc
cb-eeprom -n cb_serial

Without -n, output has the form variable=value. With -n, only the value is printed. Numeric DMCs are printed as 16 digits when their final four bytes are zero, otherwise as 24 digits. DMCs beginning with PT are interpreted as ASCII strings and may either be NUL-terminated or occupy all twelve bytes. Serial numbers are printed without leading zeroes.

Building and Installation on the Target

Since this project is quite small and has no dependencies, it is possible to compile it on the target itself. Here is an example transcript:

git clone https://github.com/chargebyte/cb-eeprom-utils.git

mkdir cb-eeprom-utils/build

cd cb-eeprom-utils/build

CMAKE_INSTALL_PATH_DEFINES=" \
      -DCMAKE_INSTALL_PREFIX:PATH=/usr \
      -DCMAKE_INSTALL_BINDIR:PATH=/usr/bin \
      -DCMAKE_INSTALL_SBINDIR:PATH=/usr/sbin \
      -DCMAKE_INSTALL_LIBEXECDIR:PATH=/usr/libexec  \
      -DCMAKE_INSTALL_SYSCONFDIR:PATH=/etc \
      -DCMAKE_INSTALL_SHAREDSTATEDIR:PATH=/var/share \
      -DCMAKE_INSTALL_LOCALSTATEDIR:PATH=/var \
      -DCMAKE_INSTALL_LIBDIR:PATH=/usr/lib \
"
export CMAKE_INSTALL_PATH_DEFINES

cmake \
      $CMAKE_INSTALL_PATH_DEFINES \
      ..

make -j$(nproc)

make install

Remember, that the tool is already pre-installed on chargebyte's distributions. The very same procedure can be used on a host system, too.