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IMPORTANT: Exactly one UART must be selected in the EFI Console-In/Out tables for a serial
console to work. The UART selected in this table is ttyS0.
The format of the console parameter is as follows:
console=ttySn[,spb]
n = Serial line
where:
s
= Speed
Example: 9600, 19200, 38400, 57600, 115200 (9600 is the default if no speed is specified. 115200
is the maximum for HP UART.)
p
= Parity
Example: n (no parity, typical case)
b
= Bit Encoding.
Example: 7, 8 (8 is the typical case).
For a 115200 baud console, the following syntax is used:
console=ttyS0,115200n8
NOTE: If you are using a Linux distribution that uses kernel revision 2.6.10 or later (Post
RHEL4), this method of specifying a console will not work. For more information on serial ports
with these kernels, see the Linux Cross Reference website:
http://lxr.linux.no/source/Documentation/ia64/serial.txt
50 Configuring and Using a Serial Console