Recovery

Intro

The following documentation describes the process of recovering hardware from the brick state using an RTE and Dasharo open-source firmware.

External flashing

Prerequisites

Prepared RTE
5x2 1mm pitch female header to 10x 2.54mm female DuPont connector adapter cable
TPM removed

Connections

To prepare the stand for flashing follow the steps described in the Generic test stand setup.

Then, follow the following steps:

Connect the adapter cable to the BIOS_PH1 header on the board
Map out the BIOS pins: Using a multimeter in continuity mode, probe each of the 2.54mm pins against each of the pins on the SOIC-16 BIOS package
Once you have labeled each of the pins, connect them to the RTE's SPI header

Firmware flashing

To flash firmware follow the steps described below:

Login to RTE via ssh or minicom.
Turn on the platform by connecting the power supply.
Wait at least 5 seconds.
Turn off the platform by using the power button.
Wait at least 3 seconds.

Set the proper state of the SPI by using the following commands on RTE:

# set SPI Vcc to 3.3V
echo 1 > /sys/class/gpio/gpio405/value
# SPI Vcc on
echo 1 > /sys/class/gpio/gpio406/value
# SPI lines ON
echo 1 > /sys/class/gpio/gpio404/value

Starting with RTE distro v0.8.x the GPIOS are 517, 518, 516.

Wait at least 2 seconds.
Disconnect the power supply from the platform.
Wait at least 2 seconds.

Check if the flash chip is connected properly

flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=16000

Flash the platform by using the following command:

flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=16000 \
    -w [path_to_binary] --ifd -i bios -N

Change back the state of the SPI by using the following commands:

echo 0 > /sys/class/gpio/gpio404/value
echo 0 > /sys/class/gpio/gpio405/value
echo 0 > /sys/class/gpio/gpio406/value

Starting with RTE distro v0.8.x the GPIOS are 516, 517, 518.

Turn on the platform by connecting the power supply.