On Wednesday, February 08, 2017, Russell King wrote: > On Wed, Feb 08, 2017 at 12:22:09PM -0500, Chris Brandt wrote: > > Since ARCH_MULTIPLATFORM explicitly selects ARM_PATCH_PHYS_VIRT, even > > though ARCH_MULTIPLATFORM has 'depends on !XIP_KERNEL', > > ARM_PATCH_PHYS_VIRT is still forcibly selected. The result is that > > PHYS_OFFSET depends on !ARM_PATCH_PHYS_VIRT. This means you cannot > > enter a physical RAM address for an XIP kernel and you cannot build. > > > > Given that it is already clear in the Kconfig that ARM_PATCH_PHYS_VIRT > > and XIP_KERNEL do not go well together (read the help for > > ARM_PATCH_PHYS_VIRT), adding this condition to ARCH_MULTIPLATFORM is > > logical and will fix this build issue. > > And, ergo, multiplatform kernels and XIP_KERNEL don't go together either. > Think about it... > > This is why I regard those who want multiplatform to work with options > such as XIP_KERNEL and NOMMU to be insane. It's not so much that I want multiplatform and XIP together (because absolutely they do not), it's that the SOC I care about is shoved under the multiplatform umbrella. > Please, can we stop trying to make multiplatform also cover the situations > where only a single class of platforms works (iow, the old way we used to > deal with platforms is the most sensible solution.) > > IMHO multiplatform was done right for multiplatform but at the expense of > totally breaking stuff like XIP and noMMU. We need to stop trying to bend > multiplatform to cover XIP and noMMU, but instead restore the old way of > handling this _along_ with multiplatform as an additional option. A while back there was a grandiose idea if it would be great you only selected 1 (and only 1) of the platforms in a multiplatform arch, then and only then would the XIP option become available for you. However, I tried everything I could, but the kbuild system just doesn't have a way to do such a thing. So, I'm back to shoving XIP and multiplatform together. So, any ideas on how I can take an ARCH_xxx and make it show up under both single and multiplatform?? Can I get away with making a separate ARCH_xxx_XIP that selects ARCH_xxx? Of course I just tested 4.10-rc7 for XIP+MMU and it works fine, but I have to hack the Kconfig each time. Chris
