arch/ia64/serial.rst

16 	- Firmware on some machines (mostly from HP) provides an HCDP
18 	  as a serial console.  If the user specified "console=ttyS0"
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
71 	- Without an HCDP, Linux defaults to a VGA console unless you
89     this if the user supplies an argument like "console=uart,io,0x3f8",
98 	- You specified "console=ttyS0" but Linux changed the device
102 	- The EFI console path contains both a VGA device and a UART.
106 	- Multiple UARTs selected as EFI console devices.  EFI and
107 	  elilo use all selected devices, but Linux uses only one.
108 	  Make sure only one UART is selected in the EFI console
111 	- You're connected to an HP MP port[2] but have a non-MP UART
112 	  selected as EFI console device.  EFI uses the MP as a
113 	  console device even when it isn't explicitly selected.
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