On Tue, Feb 08, 2011 at 05:47:18PM +0100, Arnd Bergmann wrote: > On Tuesday 08 February 2011 17:25:16 Russell King - ARM Linux wrote: > > On Tue, Feb 08, 2011 at 04:15:15PM +0100, Arnd Bergmann wrote: > > > But that doesn't work if you build a combined v5/v6/v7 kernel, because > > > v5 supports neither form, right? I think to do that, it needs the > > > same kind of abstraction that we have for a number of other things > > > like cache management in arch/arm/mm/. > > > > The options are kernels which support v3-v5 or v6-v7. There's too big > > a change between v5 and v6 to combine those into one kernel. > > Ah, good to know. I never realized this with the common binary discussions. > Building for the versatile/realview platform makes it possible to select > any of ARM926 and the v6/v6k/v7 CPUs, as well as ARM7TDMI in the same > kernel config, so I assumed that this was actually a valid configuration > aside from bugs. > > Would an attempt to make a combined v5/v6 kernel result in unacceptably > bad code, or is this just too much work for anyone to be bothered with > and little practical value?
If you build for anything less than v6, you lose all barriers, the icache synchronization, and proper atomic operations. Just to name a few. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
