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+*** Settings ***
+Documentation    Verify that the host boots between code updates of different
+...              PNOR version. Verify with N, the current version, downgrade
+...              and verify with N-1, update and verify N again, and finally
+...              update and verify with N+1.
+
+Library           ../../lib/code_update_utils.py
+Variables         ../../data/variables.py
+Resource          ../../lib/boot_utils.robot
+Resource          ../../lib/code_update_utils.robot
+Resource          ../../lib/openbmc_ffdc.robot
+
+Suite Setup       Suite Setup Execution
+
+Test Teardown     FFDC On Test Case Fail
+
+*** Variables ***
+
+${QUIET}                        ${1}
+${IMAGE_FILE_PATH}              ${EMPTY}
+${N_MINUS_ONE_IMAGE_FILE_PATH}  ${EMPTY}
+${N_PLUS_ONE_IMAGE_FILE_PATH}   ${EMPTY}
+
+*** Test Cases ***
+
+Host_Multi Code Update
+    [Documentation]  Do four code updates in a row. Update to N, N-1, N, and
+    ...              then N+1.
+    [Tags]  Host_Mult_Code_Update
+    [Template]  Code Update And Power On Host
+
+    # Image File Path
+    ${IMAGE_FILE_PATH}
+    ${N_MINUS_ONE_IMAGE_FILE_PATH}
+    ${IMAGE_FILE_PATH}
+    ${N_PLUS_ONE_IMAGE_FILE_PATH}
+
+
+*** Keywords ***
+
+Suite Setup Execution
+    [Documentation]  Do test suite setup tasks.
+
+    Should Not Be Empty  ${IMAGE_FILE_PATH}  msg=Must set IMAGE_FILE_PATH.
+    Should Not Be Empty  ${N_MINUS_ONE_IMAGE_FILE_PATH}
+    ...  msg=Must set N_MINUS_ONE_IMAGE_FILE_PATH.
+    Should Not Be Empty  ${N_PLUS_ONE_IMAGE_FILE_PATH}
+    ...  msg=N_PLUS_ONE_IMAGE_FILE_PATH.
+    Should Not Be Empty  ${OS_HOST}  msg=Must set OS_HOST.
+    Should Not Be Empty  ${OS_USERNAME}  msg=Must set OS_USERNAME.
+    Should Not Be Empty  ${OS_PASSWORD}  msg=Must set OS_PASSWORD.
+
+
+Code Update And Power On Host
+    [Documentation]  Shutdown the host, update to the given image, and then
+    ...              verify that the host is able to power on.
+    [Arguments]  ${image_file_path}
+
+    # Description of argument(s):
+    # image_file_path   Path to the host image file.
+
+    REST Power Off  stack_mode=skip  quiet=${1}
+    Delete All PNOR Images
+    Upload And Activate Image  ${image_file_path}
+    REST Power On