lkml.org 
[lkml]   [2018]   [Jun]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] [RFC] arm: Replace "multiple platforms" by "common platform"
Date
"ARM multiplatform" has actually two meanings:
  1. It groups platforms that follow the "ARM multiplatform" software
framework,
  2. It allows to build a single kernel that can be booted on multiple
     platforms.

Currently support for XIP and/or NOMMU cannot be enabled on platforms
that follow the "ARM multiplatform" framework, without duplicating their
machine selection logic under a new Kconfig symbol. As (in theory) all
platforms can be used with XIP and/or NOMMU, this is not sustainable.

Hence clarify the meaning of ARCH_MULTIPLATFORM:
1. Replace "multiple platforms" by "common platform", as it allows to
select one or more platforms adhering to the common framework,
2. Note that a single kernel may not boot on all platforms if XIP or
NOMMU is enabled.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
References:
- "[PATCHv4 0/4] arm/versatile: no-MMU support"
(http://lists.infradead.org/pipermail/linux-arm-kernel/2018-June/584555.html)

- "[PATCH 0/2] ARM: ARMv7 (with MMU) XIP without ARCH_MULTIPLATFORM"
(http://lists.infradead.org/pipermail/linux-arm-kernel/2017-February/486835.html)

arch/arm/Kconfig | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 54eeb8d00bc62a9f..6b286c018cf748c7 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -329,7 +329,7 @@ choice
default ARCH_MULTIPLATFORM if MMU

config ARCH_MULTIPLATFORM
- bool "Allow multiple platforms to be selected"
+ bool "Common platforms (\"multiplatform\")"
depends on MMU
select ARM_HAS_SG_CHAIN
select ARM_PATCH_PHYS_VIRT
@@ -342,6 +342,13 @@ config ARCH_MULTIPLATFORM
select PCI_DOMAINS if PCI
select SPARSE_IRQ
select USE_OF
+ help
+ Support for systems implemented using the common "multiplatform"
+ framework.
+
+ Unless specialized options depending on intimate platform
+ details, like XIP or NOMMU, are enabled, this allows to build a
+ single kernel that boots on multiple platforms.

config ARM_SINGLE_ARMV7M
bool "ARMv7-M based platforms (Cortex-M0/M3/M4)"
--
2.17.1
\
 
 \ /
  Last update: 2018-06-21 17:59    [W:0.048 / U:0.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site