Test how MVPD is modified (#45)

* Add test results

Signed-off-by: Igor Bagnucki <[email protected]>

* Add test with second hostboot run

Signed-off-by: Igor Bagnucki <[email protected]>

* Do tests again on pnor from op-build

Signed-off-by: Igor Bagnucki <[email protected]>

* Add dumps and screenshots

Signed-off-by: Igor Bagnucki <[email protected]>

* Fix assuptions about MVPD generation by Hostboot

Signed-off-by: Igor Bagnucki <[email protected]>

Author: Igor Bagnucki

devnotes/mvpd_generation.md

@@ -0,0 +1,40 @@
+# MVPD data modification
+
+## Test goals
+
+The main goal of this test is to check if `MVPD` partition is modified
+before starting hosboot by e.g. `HBBL` or some other part of software
+started by `Hostboot`.
+
+## Testing environement
+
+Original `PNOR` image was aquired by building [op-build](https://github.com/3mdeb/openpower-coreboot-docs/blob/main/devnotes/porting.md#building-openpower-firmware).
+
+`MVPD` partition was read using `pflash` tool:
+```
+pflash -P MVPD -r <output file>
+```
+## Test results
+
+The file containing `MVPD` partition after running `coreboot` is available
+to download [here](https://cloud.3mdeb.com/index.php/s/jk3cDHwE3M7wdKn).
+![](../images/mvpd_after_coreboot.png)
+
+The file containing `MVPD` partition after running `Hostboot` is available
+to download [here](https://cloud.3mdeb.com/index.php/s/DKrqonZDtF7pftA).
+![](../images/mvpd_after_hostboot.png)
+
+* After flashing original `PNOR` image, `MVPD` partition
+  is empty containg only `ECC`.
+* After running `Hostboot` on default `PNOR` image, `MVPD` partition
+  is modified.
+* After running `Hostboot` for a second time, `MVPD` is not modified anymore and
+  equal to image after first `Hostboot` run.
+* After running `coreboot` on default `PNOR` image, `MVPD` is not modified
+  and is still empty.
+
+## Conclusion
+
+When running `coreboot`, `MVPD` is not modified, therefore it must be filled
+after starting `Hostboot` by `Hostboot` or some other component
+started by `Hostboot`.