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Questions to Determine

  • What baud rate is configured in the BIOS for serial console redirection?
  • What baud rate is GRUB configured to use for its serial console?
  • What baud rate is the Linux kernel using for the console (console=ttyS0,XXXXX)?
  • Is there a baud rate mismatch between any of these layers (BIOS, GRUB, kernel, getty)?
  • What is the SOL client configured to use as its baud rate?
  • Was the GRUB or kernel serial console configuration changed during the RHEL 7 to RHEL 8 upgrade?
  • Is the correct serial port being used (ttyS0 vs ttyS1)?
  • Is the terminal type set correctly (VT100/ANSI) in both BIOS and the SOL client?
  • Are there any flow control mismatches (hardware RTS/CTS vs. software XON/XOFF)?