openbmc_docs/architecture/code-update/host-code-update.md

# Host Code Update

Reference:
https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/yaml/xyz/openbmc_project/Software

Following are the steps to update the host firmware (or "BIOS"). This assumes
the host is not accessing its firmware.

1. Get a squashfs image:

- Build op-build: https://github.com/open-power/op-build
- After building, the image should be a tarball in the output/images directory
  called <system type>.pnor.squashfs.tar

2. Transfer the generated squashfs image to the BMC via one of the following
   methods:

- Method 1: Via scp: Copy the generated squashfs image to the `/tmp/images/`
  directory on the BMC.
- Method 2: Via REST Upload:
  https://github.com/openbmc/docs/blob/master/rest-api.md#uploading-images
- Method 3: Via TFTP: Perform a POST request to call the `DownloadViaTFTP`
  method of `/xyz/openbmc_project/software`.

  ```
  curl -b cjar -k -H "Content-Type: application/json" -X POST \
    -d '{"data": ["<filename>", "<TFTP server IP address"]}' \
    https://${bmc}/xyz/openbmc_project/software/action/DownloadViaTFTP
  ```

3. Note the version id generated for that image file. The version id is a hash
   value of 8 hexadecimal numbers, generated by SHA-512 hashing the version
   string contained in the image and taking the first 8 characters. Get the
   version id via one of the following methods:

- Method 1: From the BMC command line, note the most recent directory name
  created under `/tmp/images/`, in this example it'd be `2a1022fe`:

  ```
  # ls -l /tmp/images/
  total 0
  drwx------    2 root     root            80 Aug 22 07:54 2a1022fe
  drwx------    2 root     root            80 Aug 22 07:53 488449a2
  ```

- Method 2: This method _only_ works if there are no `Ready` images at the start
  of transferring the image. Using the REST API, note the object that has its
  Activation property set to Ready, in this example it'd be `2a1022fe`:

  ```
  $ curl -b cjar -k https://${bmc}/xyz/openbmc_project/software/enumerate
  {
    "data": {
      "/xyz/openbmc_project/software/2a1022fe": {
        "Activation": "xyz.openbmc_project.Software.Activation.Activations.Ready",
  ```

- Method 3: Calculate the version id beforehand from the image with:

  ```
  tar xfO <squashfs image tar> MANIFEST | sed -ne '/version=/ {s/version=//;p}' | head -n1 | tr -d '\n' | sha512sum | cut -b 1-8
  ```

4. To initiate the update, set the `RequestedActivation` property of the desired
   image to `Active`, substitute `<id>` with the hash value noted on the
   previous step, this will write the contents of the image to a UBI volume in
   the PNOR chip via one of the following methods:

- Method 1: From the BMC command line:

  ```
  busctl set-property org.open_power.Software.Host.Updater \
    /xyz/openbmc_project/software/<id> \
    xyz.openbmc_project.Software.Activation RequestedActivation s \
    xyz.openbmc_project.Software.Activation.RequestedActivations.Active

  ```

- Method 2: Using the REST API:

  ```
  curl -b cjar -k -H "Content-Type: application/json" -X PUT \
    -d '{"data":
    "xyz.openbmc_project.Software.Activation.RequestedActivations.Active"}' \
    https://${bmc}/xyz/openbmc_project/software/<id>/attr/RequestedActivation
  ```

5. (Optional) Check the flash progress. This interface is only available during
   the activation progress and is not present once the activation is completed
   via one of the following:

- Method 1: From the BMC command line:

  ```
  busctl get-property org.open_power.Software.Host.Updater \
    /xyz/openbmc_project/software/<id> \
    xyz.openbmc_project.Software.Activation Progress
  ```

- Method 2: Using the REST API:

  ```
  curl -b cjar -k https://${bmc}/xyz/openbmc_project/software/<id>/attr/Progress
  ```

6. Check the activation is complete by verifying the Activation property is set
   to Active via one of the following methods:

- Method 1: From the BMC command line:

  ```
  busctl get-property org.open_power.Software.Host.Updater \
    /xyz/openbmc_project/software/<id> \
    xyz.openbmc_project.Software.Activation Activation
  ```

- Method 2: Using the REST API:

  ```
  curl -b cjar -k https://${bmc}/xyz/openbmc_project/software/<id>
  ```

### Patching the host firmware

Copy the partition binary file to `/usr/local/share/pnor/` on the BMC.

The partition binary file must be named the same as the partition name that
intends to patch, ex: `ATTR_TMP`.

### Associations, MANIFEST File, Deleting an Image, Software Field Mode, and Software Factory Reset

Information about associations, the MANIFEST file, deleting an image, software
field mode, and software factory reset can be found at
[code-update.md#associations](code-update.md#associations)

### Implementation

https://github.com/openbmc/openpower-pnor-code-mgmt