From: Bjorn Helgaas We removed 8250_acpi in 2.6.17. If we don't have PNPACPI turned on, we won't find any ACPI serial devices, so mention this requirement in the troubleshooting part of the documentation. CONFIG_PNPACPI is already turned on in all the relevant defconfigs. Signed-off-by: Bjorn Helgaas Cc: "Luck, Tony" Signed-off-by: Andrew Morton --- Documentation/ia64/serial.txt | 7 +++++++ 1 files changed, 7 insertions(+) diff -puN Documentation/ia64/serial.txt~ia64-note-requirement-for-8250_pnp-now-that-8250_acpi-is-gone Documentation/ia64/serial.txt --- a/Documentation/ia64/serial.txt~ia64-note-requirement-for-8250_pnp-now-that-8250_acpi-is-gone +++ a/Documentation/ia64/serial.txt @@ -124,6 +124,13 @@ TROUBLESHOOTING SERIAL CONSOLE PROBLEMS - Add entry to /etc/securetty for console tty. + No ACPI serial devices found in 2.6.17 or later: + + - Turn on CONFIG_PNP and CONFIG_PNPACPI. Prior to 2.6.17, ACPI + serial devices were discovered by 8250_acpi. In 2.6.17, + 8250_acpi was replaced by the combination of 8250_pnp and + CONFIG_PNPACPI. + [1] http://www.dig64.org/specifications/DIG64_PCDPv20.pdf _