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authorMarek Maslanka <mmaslanka@google.com>2024-01-12 07:24:21 +0000
committerJakub Czapiga <czapiga@google.com>2024-03-12 13:01:13 +0000
commit531c45e075c3d2f1bb0ba81df3d53acb92499229 (patch)
treeb42c840d3b8770c0c91368909977921601aec6af /src/mainboard/emulation/qemu-i440fx
parenta0b7c06d07813af1484f3a90e9dc37cc4d041fa4 (diff)
soc/intel/common/block: Add support for watchdog
Implement watchdog for intel based platform by filling ACPI Watchdog Action Table (WDAT) table. The WDAT ACPI table encompasses essential watchdog functions, including: - Setting and retrieving countdown/timeout values - Starting and stopping the watchdog - Pinging the watchdog - Retrieving the cause of the last reboot, whether it was triggered by the watchdog or another reason The general purpose register TCO_MESSAGE1 stores the reason for the most recent reboot rather than the original register TCO2_STS. This is because the firmware must clear TCO2_STS, and it can't be reused for storing this information for the operating system. The watchdog is designed for use by the OS through certain defined actions in the WDAT table. It relies on the ACPI Power Management Timer, which may result in an increase in power consumption. BUG=b:314260167 TEST=Enable CONFIG_ACPI_WDAT_WDT and CONFIG_USE_PM_ACPI_TIMER in the config. Enable CONFIG_WDAT_WDT in the kernel config. Build and deploy both firmware and kernel to the device. Trigger the watchdog by performing the command: “cat > /dev/watchdog”. Wait approximately 30 seconds for the watchdog to reset the device. Change-Id: Iaf7971f8407920a553fd91d2ed04193c882e08f1 Signed-off-by: Marek Maslanka <mmaslanka@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/79909 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Subrata Banik <subratabanik@google.com>
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