On Tue, Jun 02, 2009 at 10:10:58PM +0100, Russell King wrote: > I really don't think combining SoC support is going to be realistic, > device tree or not. When we had just four machine types (RiscPC, > EBSA110, EBSA285, Netwinder) I did look into this and came to the > conclusion that it would be far too inefficient for there to be any > win. > > The big problem we have is that the only commonality between different > SoCs is that the CPU executes ARM instructions. Everything else is > entirely up to the SoC designer - eg location of memory, spacing of > memory banks, type of interrupt controller, etc is all highly SoC > specific. Nothing outside of the ARM CPU itself is standardized. And even with the cpu core, we usually build kernels with optimized toolchains for their cpu family. But nevertheless - describing hardware inside a mach* makes sense. rsc -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- 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
