Documentation/ia64/serial.rst

16 	- Firmware on some machines (mostly from HP) provides an HCDP
23 	- If there was no HCDP, we assumed there were UARTs at the
34     For example, an HP rx1600 with a single built-in serial port
39       Type        MMIO           pre-2.6.10      pre-2.6.10     2.6.10+
63 	- If your firmware supplies the HCDP, it is simplest to
64 	  configure EFI with a single device (either a UART or a VGA
71 	- Without an HCDP, Linux defaults to a VGA console unless you
98 	- You specified "console=ttyS0" but Linux changed the device
102 	- The EFI console path contains both a VGA device and a UART.
103 	  EFI and elilo use both, but Linux defaults to VGA.  Remove
104 	  the VGA device from the EFI console path[3].
106 	- Multiple UARTs selected as EFI console devices.  EFI and
111 	- You're connected to an HP MP port[2] but have a non-MP UART
114 	  Either move the console cable to the non-MP UART, or change
120 	- No early console because you used "console=ttyS<n>".  Remove
123 	- If you don't have an HCDP, the kernel doesn't know where
130 	- Add getty entry to /etc/inittab for console tty.  Look for
136 	- Add entry to /etc/securetty for console tty.
140 	- Turn on CONFIG_PNP and CONFIG_PNPACPI.  Prior to 2.6.17, ACPI
157     The external connection is usually a 25-pin connector, and a
158     special dongle converts that to three 9-pin connectors, one of