[Buildroot] [PATCH] arch/arm: add support for thumb(1) mode

Thomas Petazzoni thomas.petazzoni at free-electrons.com
Wed Jul 17 19:58:26 UTC 2013

Dear Gustavo Zacarias,

On Wed, 17 Jul 2013 13:03:56 -0300, Gustavo Zacarias wrote:

> > Which leads me to this question: is adding Thumb support as simple as
> > what you're adding? Aren't there some additional thumb-interworking
> > complexities to handle?
> http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf
> Section 5.6 is of interest, once OABI (APCS) was dropped interworking
> isn't that hard since it's mandatory for AAPCS.

Ok, so if I select "Thumb" for ARMv5T, but use a normal ARMv5
external toolchain (compiled ARM, not Thumb), it should work. Am I


Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.

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