Hello Russell, On Wednesday, February 08, 2017, Russell King wrote: > We have the big "ARM system type" choice, one of the options there is to > build for multi-platform. Historically, it's been to select the SoC > family - where "SoC family" means a group of SoCs that could be built > together into one image without all the fun and games of V:P patching, > auto-zreladdr, etc - _exactly_ the conditions that !MMU and XIP_KERNEL > depended upon[*]. > > To allow a SOC to be built without multiplatform, you add another option > to that choice statement (exactly as we used to have before multiplatform). > For the sake of argument, let's say we're talking about iMX ARMv7 SoCs. > So, let's call it ARM_SOC_IMX_V7. > > You add to that all the select statements that multiplatform gives you > that you need for that platform, omitting those that don't make sense > (like virt/phys patching), making it depend on XIP_KERNEL and/or !MMU. > > Then you change the mach-*/Kconfig entry like this: > > menuconfig ARCH_MXC > - bool "Freescale i.MX family" > - depends on ARCH_MULTI_V4_V5 || ARCH_MULTI_V6_V7 || > ARM_SINGLE_ARMV7M > + bool "Freescale i.MX family" if !ARM_SOC_IMX_V7 > + depends on ARCH_MULTI_V4_V5 || ARCH_MULTI_V6_V7 || > ARM_SINGLE_ARMV7M ||\ > + ARM_SOC_IMX_V7 > + default ARM_SOC_IMX_V7 > > and also modify the if ARCH_MULTI_V7 to also allow that section if > ARM_SOC_IMX_V7 is enabled. > > > * - that's the problem - multiplatform went head-long into the "we don't > like the existing solution, we need to move everyone away, and let's hope > no one wants XIP_KERNEL or !MMU now". So we went from a relatively good > solution that didn't support building diverse platforms together to one > that rather sucks for XIP_KERNEL and !MMU. So, a quick hack and it seems that works. I get my family of SoC that I can select XIP_KERNEL. I'll do some build experiments, and if it looks like it will work, I'll send off a patch to see how opposes it. For the most part, if everyone is off playing in the multiplatform pool, me creating a new ARM V7 single-platform pool won't affect anyone. Chris
