Messages in this thread | | | From | <> | Subject | Re: Two issues with 2.4.18pre3 on PPC | Date | Wed, 16 Jan 2002 17:37:37 +0100 |
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>- The generic RTC driver in drivers/char/rtc.c does not work for this > iBook. The driver in drivers/macintosh/rtc.c does work, but it only > implements the two ioctls RTC_RD_TIME and RTC_SET_TIME. (Is this due to > hardware limitations?) Anyway, it is confusing to have both drivers > configurable for PPC, maybe the corresponding Config.in files should be > adjusted. (In addition, this is complicated by the fact that both > configuration options appear in different submenus and if you select > both as modules, then the generic driver will "shadow" the macintosh > one.)
That's a weirdness we haven't solved yet. Part of the problem is that a common kernel can boot pmac, chrp and prep, and the later ones can use the drivers/char/rtc.c driver. Actually, the drivers/macintosh/rtc.c one may work on these too as it's just a wrapper on some platform code selected at runtime depending on the machine class.
Now, regarding the support of only GET/SET ioctls, it's normal. Some of these machines don't have the legacy PC hardware RTC with alarm support etc... That's the case of macs where the RTC hardware is purely a real time clock. (It has other features, like scheduled power up, but these aren't implemented yet and could be done entirely in userland using /dev/adb anyway).
So the driver in drivers/macintosh/rtc.c is just a wrapper on the get/set time functions provided by each type of machine.
Ben.
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