The following patchset tries to address an issue where the watchdog counter was running as soon as the device is out of reset. This created a few problems with the firmware under test. It was pointed out that the firmware under test was already working on an emulator using the real RTL. Further review showed that the WDOGCONTROL.INTEN is also expected to be the counter enable as it is defined in this page from ARM:
https://developer.arm.com/documentation/ddi0479/d/apb-components/apb-watchdog/programmers-model?lang=en | | Enable the interrupt event, WDOGINT. Set to 1 to | | enable the counter and the interrupt, or to 0 to [0] | INTEN | disable the counter and interrupt. Reloads the | | counter from the value in WDOGLOAD when the interrupt | | is enabled, after previously being disabled. The second half of the patch is focused on adding tests for this behavior. It was required to modify the test to be able to run some test cases in the MPS2 since the the stellaris machine had 2 issues: - The stellaris machine did not run the counter out of reset because of the way it is reset. The function ssys_calculate_system_clock is not called until the reset phase stellaris_sys_reset_hold which is after the watchdog executes its reset, so the watchdog would not start the counter due to the clock not being set up at the time of reset. - The Stellaris machine uses a derived watchdog and not the original CMSDK one which has a special behavior where it cannot be stopped. The MPS2 machine on the other hand uses the standard CMSDK watchdog and could expose the problems we were dealing with. Roque Arcudia Hernandez (5): hw/watchdog/cmsdk_apb_watchdog: Fix broken link hw/watchdog/cmsdk_apb_watchdog: Fix INTEN issues tests/qtest/cmsdk-apb-watchdog-test: Parameterize tests tests/qtest/cmsdk-apb-watchdog-test: Don't abort on assertion failure tests/qtest/cmsdk-apb-watchdog-test: Test INTEN as counter enable hw/watchdog/cmsdk-apb-watchdog.c | 38 ++- tests/qtest/cmsdk-apb-watchdog-test.c | 328 +++++++++++++++++++++++--- tests/qtest/meson.build | 3 +- 3 files changed, 329 insertions(+), 40 deletions(-) -- 2.47.0.338.g60cca15819-goog
