Stefan Seyfried wrote: > Hi Per, > > On 04.01.21 14:13, Per Jessen wrote: > >>>> In grub, edit the command line, put "console=ttyS0..." last (after >>>> "console=tty") and maybe add "earlyprintk=serial,ttyS0,115200", >>>> then remove the "loglevel=...", "splash=..." and instead add >>>> "debug" to get as much output from the kernel as early as possible. >> >> I tried that, still no more output after this line: > > OK, then it is of course possible that the kernel just does not start > at all. > > If you'd want to give it another try, one method to verify that your > command line is actually working for early kernel debugging
I tried the same options with the TW jeOS image, works fine: Loading Linux 5.8.15-1-lpae ... mods Loading initial ramdisk ... EFI stub: Entering in HYP mode with MMU enabled EFI stub: Booting Linux Kernel... EFI stub: Using DTB from configuration table EFI stub: Exiting boot services and installing virtual address map... EHCI failed to shut down host controller. [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 5.8.15-1-lpae (geeko@buildhost) (gcc (SUSE Linux) 10.2.1 20200825 [revision c0746a1beb1ba073c7981eb09f55b3d993b32e5c], GNU ld (GNU Binutils; openSUSE Tumbleweed) 2.34.0.20200325-1) #1 SMP Thu Oct 15 08:10:08 UTC 2020 (c680e93) [ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=30c5387d [ 0.000000] CPU: div instructions available: patching division code [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt: Machine model: FriendlyARM NanoPi NEO [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] efi: EFI v2.80 by Das U-Boot [ 0.000000] efi: RTPROP=0x5af49040 SMBIOS=0x5af48000 MEMRESERVE=0x512a7040 [ 0.000000] efi: [Firmware Bug]: ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware! [ 0.000000] efi: CPSR at EFI stub entry : 0x600001da [ 0.000000] efi: SCTLR at EFI stub entry : 0x30c5087d [ 0.000000] efi: CPSR after ExitBootServices() : 0x600001da [ 0.000000] efi: SCTLR after ExitBootServices(): 0x30c50878 [ 0.000000] cma: Reserved 64 MiB at 0x000000005bc00000 Kernel command line: BOOT_IMAGE=/boot/zImage-5.8.15-1-lpae root=UUID=32ca1b87-ae87-4304-8a89-754e69244b54 rw debug earlyprintk=serial,ttyS0,115200 console=ttyS0,115200,8n1 plymouth.enable=0 -- Per Jessen, Zürich (-0.6°C)
