arch/arm: Cortex-M3 provides only Thumb-2

The Cortex-M cores only support Thumb-2, not Thumb. In fact, Thumb-2
is a superset of Thumb, and we could have a single option for both in
Buildroot, since -mthumb on ARMv4/v5 means original Thumb, while
-mthumb on ARMv7 means Thumb 2. However, for clarity, it makes sense
to have two separate options. But in this case, Cortex-M3 should not
advertise that it supports Thumb, as in fact selecting Thumb would
generate Thumb-2 code.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/arch/Config.in.arm b/arch/Config.in.arm
index 33f763a306ba56ff429715e6eba03940ae48e6ff..cd1ec33b1874f867aea89e673076749d7518fee0 100644 (file)
--- a/arch/Config.in.arm
+++ b/arch/Config.in.arm
@@ -172,7 +172,6 @@ config BR2_cortex_a17
        select BR2_ARCH_HAS_MMU_OPTIONAL
 config BR2_cortex_m3
        bool "cortex-M3"
-       select BR2_ARM_CPU_HAS_THUMB
        select BR2_ARM_CPU_HAS_THUMB2
        select BR2_ARM_CPU_ARMV7M
 config BR2_fa526