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Grading Checklist

  • Identified the baud rate mismatch as the primary cause of garbled output
  • Checked all four layers for baud rate settings: BIOS, GRUB, kernel, getty/agetty
  • Recognized that the RHEL 8 upgrade changed the default serial console baud rate in GRUB
  • Verified the BIOS serial console redirection settings (COM port, baud rate, flow control, terminal type)
  • Checked GRUB configuration (/etc/default/grub and grub.cfg) for serial settings
  • Checked kernel command line for console=ttyS0,BAUDRATE parameter
  • Proposed aligning all layers to the same baud rate (typically 115200)
  • Mentioned regenerating the GRUB config after changes (grub2-mkconfig)
  • Tested the fix by reconnecting SOL after the changes
  • Addressed why this broke during the upgrade (RHEL 8 defaults differ from RHEL 7)
  • Noted the need to verify the correct COM port (ttyS0 vs ttyS1) for the BMC