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ARM: make default platform work for NOMMU

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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>
This commit is contained in:
Arnd Bergmann 2015-12-17 17:45:47 +01:00
parent 06920d4eea
commit 70722803de
2 changed files with 2 additions and 2 deletions
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2
arch/arm/Kconfig
View File

@ -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

2
arch/arm/kernel/devtree.c
View File

@ -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