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SubjectRe: [PATCH] Enable legacy support for serial ports when SERIAL_8250_PNP is disabled
Date
On Saturday 07 July 2007 05:33:00 pm Luca Tettamanti wrote:
> your patch:
>
> commit 7e92b4fc345f5b6f57585fbe5ffdb0f24d7c9b26
> Author: Bjorn Helgaas <bjorn.helgaas@hp.com>
> 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
> discovery.
>
> 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:

Yes, that's true. Kconfig should automatically turn on SERIAL_8250_PNP
if PNP and SERIAL_8250 are selected, but it does give you a choice if
you have EMBEDDED set. So I guess you must have this:

CONFIG_EMBEDDED=y
CONFIG_PNP=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_PNP=n

Why do you want PNP support, but not 8250_PNP support? If you turn off
PNP completely, you will have "pnp_platform_devices == 0", and the
existing code will do what you need.

> Enable probing of serial ports using legacy code when PNP code
> (SERIAL_8250_PNP) is not enabled.
>
> Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
>
> ---
>
> 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;
> +#else
> static int force_legacy_probe;
> +#endif
> module_param_named(force, force_legacy_probe, bool, 0);
> MODULE_PARM_DESC(force, "Force legacy serial port probe");
>
>
>
> Luca


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