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No kernel bootlog on serial port.
Today I updated the kernel, and so had to reboot. I first changed verbosity, and rebooted. The box didn't come back. So I hooked up the serial cable, and power cycled it. No serial output, and no boot. I power cycled again, still no output, but it did boot. Weird. Is there a drawback to leave it running with verbosity on 7? And if there isn't, why isn't that the default?
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No kernel bootlog on serial port.
Today I upgraded my Helios64, and after reboot it didn't come back. (Waited for 5 minutes or so) After connecting a serial cable (via the USB-C connector), and rebooting, I saw a normal bootloader log (as far as I can see), but no kernel log, just a repeated 'ERROR: rockchip_plat_sip_handler: unhandled SMC (0x82000003)'. I rebooted again, to create a bootlog file, and I saw the same. Then suddenly, after a minute or so, I saw network activity, and my Helios64 was back. Now I have 3 questions. 1) Why didn't it boot twice, and then succeeded? 2) Why is there no kernel bootlog? 3) What is an unhandled SMC? The log ended with ERROR: rockchip_plat_sip_handler: unhandled SMC (0x82000003) ERROR: rockchip_plat_sip_handler: unhandled SMC (0x82000003) p104^Gp104^G Armbian 26.5.1 trixie ttyS2 helios64 login: So apparently the serial port is ttyS2. dmesg gave me this info: sudo dmesg | grep tty [ 0.000000] Kernel command line: root=UUID=d03fc106-73e9-4465-89a6-b23dbd26eddd rootwait rootfstype=btrfs splash=verbose console=ttyS2,1500000 console=tty1 consoleblank=0 loglevel=1 ubootpart= usb-storage.quirks=0x2537:0x1066:u,0x2537:0x1068:u cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory [ 0.001587] printk: legacy console [tty1] enabled [ 1.986600] ff180000.serial: ttyS0 at MMIO 0xff180000 (irq = 31, base_baud = 1500000) is a 16550A [ 1.988766] ff1a0000.serial: ttyS2 at MMIO 0xff1a0000 (irq = 32, base_baud = 1500000) is a 16550A [ 1.988911] printk: legacy console [ttyS2] enabled [ 7.930510] systemd[1]: Created slice system-getty.slice - Slice /system/getty. [ 7.934926] systemd[1]: Created slice system-serial\x2dgetty.slice - Slice /system/serial-getty. [ 7.938724] systemd[1]: Expecting device dev-ttyS2.device - /dev/ttyS2... [ 8.771412] systemd[1]: Found device dev-ttyS2.device - /dev/ttyS2. Is it normal that there are 2 legacy consoles enabled? minicom.cap
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