Hello, I'm working with the BeagleBone and gcc-4.5.4 on Gentoo. If I try to compile the 3.6 kernel with CONFIG_THUMB2_KERNEL, I get:
arch/arm/boot/compressed/head.S:127: Error: selected processor does not support requested special purpose register -- `mrs r2,cpsr' arch/arm/boot/compressed/head.S:134: Error: selected processor does not support requested special purpose register -- `mrs r2,cpsr' arch/arm/boot/compressed/head.S:136: Error: selected processor does not support requested special purpose register -- `msr cpsr_c,r2' This post indicates that mainline gcc does not currently support thumb2: https://groups.google.com/d/msg/beagleboard/P52fgMDzp8A/vupzuh71vdYJ However, this indicates that thumb2 has been supported since 4.3: http://gcc.gnu.org/gcc-4.3/changes.html Can anyone clear this up? - Grant
