Distro/RHEL/AMI: set the ttyS0 as primary console (RHEL-32885) #617
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Current RHEL AMIs have two console parameters 'console=ttyS0,115200n8 console=tty0', which set tty0 as the primary console. As a result, we have less information printed than the RHEL guest image, Amazon Linux and Ubuntu during the boot. To keep this setting consistent with RHEL guest image and make it more useful for boot debug, set the ttyS0 as the primary console.