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| author | Arnd Bergmann <arnd@arndb.de> | 2015-12-17 19:45:47 +0300 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2015-12-17 19:45:47 +0300 |
| commit | 70722803de91a7670979dcb5748631b4e3c1b219 (patch) | |
| tree | 1b34eb87310cfd6b69e8b73a9588a0dbb7d46110 | |
| parent | 06920d4eeabcd824436ace6fbd6cf49739a5812a (diff) | |
| download | linux-70722803de91a7670979dcb5748631b4e3c1b219.tar.xz | |
ARM: make default platform work for NOMMU
Moving ARCH_VERSATILE into ARCH_MULTIPLATFORM means that it no longer
works as the default target for MMU-less kernels. While we might
want to get that working again in the future, it's also a rather
bad default, and it makes sense to make ARM_SINGLE_V7M the default
because that is what realistically all NOMMU users on ARM are using,
and it actually is what gets selected by default in the absence of
versatile in the choice statement.
Related to this, 'allnoconfig' kernels fail to link with the new
default, as they do not include a machine record:
arm-linux-gnueabi-ld: no machine record defined
For ARCH_MULTIPLATFORM kernels, we avoid this error by using a
default machine descriptor that works for all trivial platforms,
like ARCH_VIRT. The same reasoning applies for ARM_SINGLE_V7M,
as that can also boot with empty machine descriptors both on
qemu and on real hardware, as long as all the drivers are present.
We could also follow up with a patch to remove the existing
machine descriptors for the ARMv7M platforms, the only callback
pointer the four platforms contain today is the armv7m_restart
handler and we can simply make that the default for v7M with an
add-on patch.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
| -rw-r--r-- | arch/arm/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/devtree.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 72c1df041ae8..a0fda44551ec 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -313,7 +313,7 @@ config MMU # choice prompt "ARM system type" - default ARCH_VERSATILE if !MMU + default ARM_SINGLE_ARMV7M if !MMU default ARCH_MULTIPLATFORM if MMU config ARCH_MULTIPLATFORM diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c index 65addcbf5b30..2e26016a91a5 100644 --- a/arch/arm/kernel/devtree.c +++ b/arch/arm/kernel/devtree.c @@ -211,7 +211,7 @@ const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys) { const struct machine_desc *mdesc, *mdesc_best = NULL; -#ifdef CONFIG_ARCH_MULTIPLATFORM +#if defined(CONFIG_ARCH_MULTIPLATFORM) || defined(CONFIG_ARM_SINGLE_ARMV7M) DT_MACHINE_START(GENERIC_DT, "Generic DT based system") MACHINE_END |