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Subject[PATCH] Enable legacy support for serial ports when SERIAL_8250_PNP is disabled
Hi Bjorn,
your patch:

commit 7e92b4fc345f5b6f57585fbe5ffdb0f24d7c9b26
Author: Bjorn Helgaas <>
Date: Tue May 8 00:36:07 2007 -0700

x86, serial: convert legacy COM ports to platform devices

disables probing using legacy code in favour of ACPI/PNP to avoid double

However if SERIAL_8250_PNP is not enabled the user is left without
serial ports (been there, done that - my kernel config suddenly wasn't
working anymore). So:

Enable probing of serial ports using legacy code when PNP code
(SERIAL_8250_PNP) is not enabled.

Signed-off-by: Luca Tettamanti <>


arch/i386/kernel/legacy_serial.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/i386/kernel/legacy_serial.c b/arch/i386/kernel/legacy_serial.c
index 2151011..457d307 100644
--- a/arch/i386/kernel/legacy_serial.c
+++ b/arch/i386/kernel/legacy_serial.c
@@ -48,7 +48,11 @@ static struct platform_device x86_com_device = {

+#ifndef CONFIG_SERIAL_8250_PNP
+static int force_legacy_probe = 1;
static int force_legacy_probe;
module_param_named(force, force_legacy_probe, bool, 0);
MODULE_PARM_DESC(force, "Force legacy serial port probe");

La vispa candela bruciava l'erbetta
creando un'essenza alquanto sospetta;
sembrava l'odore di una sacrestia
ma presto mi accorsi che era maria.
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