December 2006
Intermediate to advanced
202 pages
8h 29m
English
Content preview from Linux Kernel in a NutshellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Name
earlyprintk — Show early boot messages.
Synopsis
earlyprintk=[vga|serial][,ttyS
n[,baudrate]][,keep]
Show kernel log messages that precede the initialization of
the traditional console. These messages are typically never seen on
the console unless you use this option. Enabling this can be very
useful for tracking down hardware issues. Currently, the option can
specify either the VGA device or the serial port, but not both at
the same time. Also, only the ttyS0 or ttyS1 serial devices will work.
Interaction with the standard serial driver is not very good, and
the VGA output will eventually be overwritten by the real
console.
Append ,keep in order not to disable
the messages shown by this option when the real kernel console is
initialized and takes over the system.
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