unified/hardkernel/recovery.md: Add

Signed-off-by: Filip Gołaś <[email protected]>

docs/unified/hardkernel/recovery.md

@@ -1 +1,69 @@
-recovery
+# Recovery
+
+## Intro
+
+The following documentation describes the process of recovering hardware from
+the brick state using an [RTE](../../transparent-validation/rte/introduction.md)
+and Dasharo open-source firmware.
+
+=== "V1000-series"
+
+    ## Prerequisites
+
+    * [Prepared RTE](../../transparent-validation/rte/v1.1.0/quick-start-guide.md)
+    * 6x female-female wire cables
+
+    ## Connections
+
+    To prepare the stand for flashing follow the steps described in
+    the [Generic test stand setup](../../unified-test-documentation/generic-testing-stand-setup.md#detailed-description-of-the-process)
+
+    ## Firmware flashing
+
+    To flash firmware follow the steps described below:
+
+    1. Login to RTE via `ssh` or `minicom`.
+    2. Turn on the platform by connecting the power supply.
+    3. Wait at least 5 seconds.
+    4. Turn off the platform by using the power button.
+    5. Wait at least 3 seconds.
+    6. Set the proper state of the SPI by using the following commands on RTE:
+
+        ```bash
+        # 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
+        ```
+
+    7. Wait at least 2 seconds.
+    8. Disconnect the power supply from the platform.
+    9. Wait at least 2 seconds.
+    10. Check if the flash chip is connected properly
+
+        ```bash
+        flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=16000
+        ```
+
+    11. Flash the platform by using the following command:
+
+        ```bash
+        flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=16000 -w [path_to_binary]
+        ```
+
+        > Flashing with flashrom takes about 1 minute.
+
+    12. Change back the state of the SPI by using the following commands:
+
+        ```bash
+        echo 0 > /sys/class/gpio/gpio404/value
+        echo 0 > /sys/class/gpio/gpio405/value
+        echo 0 > /sys/class/gpio/gpio406/value
+        ```
+
+    12. Turn on the platform by connecting the power supply.
+
+    The first boot of the platform after proceeding with the above procedure can
+    take much longer than normal.