On Friday 01 May 2009, Alan Cox wrote: > Joining in late but its not at all highly PC specific. The same frequency > is used for a whole pile of setups (Alpha etc). It's not well named but > there are good sound reasons the PC chose 1193182 and while those reasons > have long lapsed its a good frequency for other reasons nowdays. > > The clock isn't for the PIC either - its for the PIT (although its used > to clock various other things). > > We actually have a define of PIT_TICK_RATE internal to the x86 port for > those x86 cases that can use it. How about this comment then: /* * CLOCK_TICK_RATE is traditionally the base frequency using the PC-style * i8253 "PIT" timer. Architecture independent device drivers should not * rely on this value. * Any architecture that either has a real PC-style PIT, or does not have a * fixed timer interval at all and just needs to provide some value here * should just fall back to this default. */ Arnd <>< -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
