Das mit dem systemd Dienst oben könnt ihr vergessen Das würde die Konsole viel zu spät starten, wir brauchen die ja viel früher.
nano /etc/default/grub
Inhalt der Datei
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="console=ttyS0,115200n8"
GRUB_CMDLINE_LINUX=""
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
## Serial console
GRUB_TERMINAL=serial
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
Grub ist der Bootloader, damit wird jetzt sofort beim Start die serielle Konsole geöffnet. Nach dem Ändern der Datei, müssen wir den grub noch aktualisieren.
sudo update-grub
Danach kann man neustarten. Nun sieht man nichts mehr auf dem HDMI-Monitor, sondern alles in der seriellen Konsole. Wenn man nach Fehlern sucht einfach unverzichtbar. Auch das Grub Bootmenü taucht nun in der Konsole auf.
Loading Linux 4.19.0-4-amd64 ...
Loading initial ramdisk ...
[ 0.000000] Linux version 4.19.0-4-amd64 (debian-kernel@lists.debian.org) (g)
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.19.0-4-amd64 root=UUID=8
[ 0.000000] x86/fpu: x87 FPU will use FXSAVE
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000008efff] usable
[ 0.000000] BIOS-e820: [mem 0x000000000008f000-0x000000000008ffff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x0000000000090000-0x000000000009dfff] usable
[ 0.000000] BIOS-e820: [mem 0x000000000009e000-0x000000000009ffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001effffff] usable
[ 0.000000] BIOS-e820: [mem 0x000000001f000000-0x00000000201fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000020200000-0x000000007b9b3fff] usable
[ 0.000000] BIOS-e820: [mem 0x000000007b9b4000-0x000000007b9e3fff] reserved
[ 0.000000] BIOS-e820: [mem 0x000000007b9e4000-0x000000007ba07fff] ACPI data
[ 0.000000] BIOS-e820: [mem 0x000000007ba08000-0x000000007baeafff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x000000007baeb000-0x000000007bd80fff] reserved
[ 0.000000] BIOS-e820: [mem 0x000000007bd81000-0x000000007bdeefff] type 20
[ 0.000000] BIOS-e820: [mem 0x000000007bdef000-0x000000007bffffff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000e0000000-0x00000000e3ffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fea00000-0x00000000feafffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed01000-0x00000000fed01fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed03000-0x00000000fed03fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed06000-0x00000000fed06fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed08000-0x00000000fed09fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1cfff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed80000-0x00000000fedbffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000ffc00000-0x00000000ffffffff] reserved
[ 0.000000] NX (Execute Disable) protection: active
[ 0.000000] efi: EFI v2.40 by American Megatrends
[ 0.000000] efi: ESRT=0x7b9e2000 ACPI=0x7b9eb000 ACPI 2.0=0x7b9eb000 SMB
[ 0.000000] secureboot: Secure boot could not be determined (mode 0)
[ 0.000000] SMBIOS 3.0.0 present.
[ 0.000000] DMI: AAEON MF-001/MF-001, BIOS MFC1AM12 01/30/2018
[ 0.000000] tsc: Detected 1440.000 MHz processor
[ 0.000059] last_pfn = 0x7c000 max_arch_pfn = 0x400000000
[ 0.000301] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT
[ 0.010131] esrt: ESRT header is not in the memory map.
[ 0.011611] RAMDISK: [mem 0x31fd1000-0x34fdffff]
[ 0.011631] ACPI: Early table checksum verification disabled
[ 0.011640] ACPI: RSDP 0x000000007B9EB000 000024 (v02 ALASKA)
[ 0.011653] ACPI: XSDT 0x000000007B9EB0A8 0000CC (v01 ALASKA A M I 010720)
[ 0.011670] ACPI: FACP 0x000000007BA012B0 00010C (v05 ALASKA A M I 010720)
[ 0.011686] ACPI: DSDT 0x000000007B9EB200 0160AA (v02 ALASKA A M I 010720)
[ 0.011698] ACPI: FACS 0x000000007BAD2F80 000040
[ 0.011707] ACPI: APIC 0x000000007BA013C0 000084 (v03 ALASKA A M I 010720)
[ 0.011718] ACPI: FPDT 0x000000007BA01448 000044 (v01 ALASKA A M I 010720)
[ 0.011728] ACPI: FIDT 0x000000007BA01490 00009C (v01 ALASKA A M I 010720)
[ 0.011738] ACPI: MCFG 0x000000007BA01530 00003C (v01 ALASKA A M I 010720)
[ 0.011749] ACPI: SSDT 0x000000007BA01570 0041C5 (v01 DptfTb DptfTab 000010)
[ 0.011759] ACPI: SSDT 0x000000007BA05738 000654 (v01 CpuDpf CpuDptf 000010)
[ 0.011771] ACPI: SSDT 0x000000007BA05D90 000058 (v01 LowPM LowPwrM 000010)
[ 0.011782] ACPI: UEFI 0x000000007BA05DE8 000042 (v01 ALASKA A M I 000000)
[ 0.011793] ACPI: SSDT 0x000000007BA05E30 000269 (v01 UsbCTb UsbCTab 000010)
[ 0.011803] ACPI: HPET 0x000000007BA060A0 000038 (v01 ALASKA A M I 010720)
[ 0.011813] ACPI: SSDT 0x000000007BA060D8 000763 (v01 PmRef CpuPm 000030)
[ 0.011825] ACPI: SSDT 0x000000007BA06840 000290 (v01 PmRef Cpu0Tst 000030)
[ 0.011836] ACPI: SSDT 0x000000007BA06AD0 00017A (v01 PmRef ApTst 000030)
[ 0.011846] ACPI: LPIT 0x000000007BA06C50 000104 (v01 ALASKA A M I 000000)
[ 0.011856] ACPI: BCFG 0x000000007BA06D58 000139 (v01 INTEL BATTCONF 000000)
[ 0.011866] ACPI: PRAM 0x000000007BA06E98 000030 (v01 000000)
[ 0.011877] ACPI: BGRT 0x000000007BA06EC8 000038 (v01 ALASKA A M I 010720)
[ 0.011887] ACPI: TPM2 0x000000007BA06F00 000034 (v03 Tpm2Tabl 000000)
[ 0.011897] ACPI: CSRT 0x000000007BA06F38 00014C (v00 INTEL LANFORDC 000000)
[ 0.011909] ACPI: WDAT 0x000000007BA07088 000104 (v01 000000)
[ 0.012204] No NUMA configuration found
Die vollständige Ausgabe hier auf pastebin.com
Projekt UART erfolgreich beendet. Manche Dinge lassen einem ja keine Ruhe LOL
