According to the log: 1. By searching "wdt|watchdog", 'mtk-wdt' cannot be found even we've installed 'mtk_wdt.ko' into initrd.img.
2. The system will always hardware reset around 9~11 seconds. 3. BL2: TFA will show the "WDT: Last reset was hardware watchdog". 989: WDT: Started watchdog@10007000 with servicing (60s timeout) 2434: [ 0.191906] calling gtdt_sbsa_gwdt_init+0x0/0x128 @ 1 2435: [ 0.191915] initcall gtdt_sbsa_gwdt_init+0x0/0x128 returned 0 after 0 usecs 4657: NOTICE: WDT: Status = 0x80000000 4658: NOTICE: WDT: Last reset was hardware watchdog 4784: [PMIC] [pmic_check_rst] AP Watchdog 4787: [PMIC] [pmic_wdt_set] TOP_RST_MISC=0x225 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2036577 Title: [Mediatek] mt8195-demo: Fix hardware watchdog reset at boot time around 10 sec. Status in linux package in Ubuntu: Incomplete Status in lunar package in Ubuntu: New Bug description: [Impact] hardware reset during boot time. [Fix] Compare to generic kernel config for arm64 file: arch/arm64/configs/defconfig The CONFIG_MEDIATEK_WATCHDOG should be enabled "built-in" in generic kernel settings. CONFIG_MEDIATEK_WATCHDOG=y I've discovered that the module mtk_wdt.ko (CONFIG_MEDIATEK_WATCHDOG) must be set as built-in to prevent the system from encountering a hardware reset during the boot process. I've tried building it as a module and installing it into initrd, and I've also attempted to set softdep for it. However, I still can't find it being probed in the initcall debug dump. The system also reboots around 10 seconds into the boot time. After setting CONFIG_MEDIATEK_WATCHDOG=y, the hardware reset issue was resolved and the system was able to boot into the console. [Other info] effected kernel (5.19~latest) ubuntu kernel for lunar, Kinetic, and Mantic. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2036577/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
