Re: RTC_DRV_CMOS can break userspace interface

[Matthew Garrett <mjg59@srcf.ucam.org>]

On Sun, May 27, 2007 at 08:03:51PM +0100, Matthew Garrett wrote:

> (It doesn't really help that rtc-cmos doesn't load on this machine, but 
> I'll try to track that down later - right now I suspect some sort of PNP 
> issue)

Ah, no, it's because the ioports for the rtc-cmos driver are already 
claimed by the old driver from CONFIG_RTC. The following configuration 
is valid in Kconfig:

CONFIG_RTC=y
CONFIG_RTC_CMOS=m

but will disable /proc/acpi/wakeup. It'll also be impossible to load 
CONFIG_RTC_CMOS because CONFIG_RTC has grabbed the io ports, so it's not 
possible to use the new interface. This situation doesn't appear to be 
documented, which is less than ideal...

-- 
Matthew Garrett | mjg59@srcf.ucam.org