sparc: break out some prom device-tree building code out into drivers/of
in [Kernel]
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From: Benjamin Herrenschmidt on 6 Jul 2010 06:30 > Sounds like we have a winner. I'll concentrate on that, thanks for > the heads up. Note that the conversion from OF -> fdt that powerpc does is a bit "special". The code isn't quite a "wrapper" but almost. It shared pretty much no symbols or variables with the rest of the kernel. There are various reasons for that. It has to run -very- early, in fact, before we do anything else at boot time, since we run off OF existing environment (stack etc...) at at whatever address the kernel is loaded, ie. before we relocate it down to 0. To deal with that, we use compile/linker tricks to generate pseudo-relocatable code (with limitations) and funny macros when accessing global symbols. In addition, we have various workarounds for powerpc specific implementation issues (OF bugs, but also instanciating the IOMMU tables on Power4, starting secondary CPUs and parking them in a wait loop, etc...). Thus I'm not sure there's that much benefit in trying to make that code common with other archs, and possibly a lot of pain involved. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |