Hi John,
This was answered recently here: http://sel4.systems/pipermail/devel/2017-June/001455.html
In summary, we don't currently give threads access to the FPU on arm and the VMM cannot emulate the instructions but this should change soon. There is a patch internally for making the FPU accessible that someone was testing with armhf on the TK1 today. When the patch gets moved, we may be able to update everything to use armhf toolchains.
Kent.
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From: Devel