--- On Tue, 12/7/10, Dave Martin <[email protected]> wrote: > From: Dave Martin <[email protected]> > Subject: [PATCH] ARM: Thumb-2: Make CONFIG_THUMB2_KERNEL depend on !CPU_V6...
> This makes sense, because Thumb-2 > code can't execute on anything > prior to ARMv7. WRONG ... but you may be overlooking the fact that there are at least three flavors of Thumb-2 ... - Original, as on some ARMv6 chips ARM1156 was the introductory Thumb2 core). It's Thumb1 plus a very few 32-bit instructions. (And maybe the SIMD instructions too; I forget. Not suitable for OS work like IRQ handling, ISTR; or at least, not as suitable as the ARMv7 flavors. -Microcontroller ... ARMv7M chips, and likely not available on Linux-capable hardware ... Suitable for RTOS work like IRQ handling. - Applications ... ARMv7A chips ... like those V6 chips with THUMB2, but with SIMD "multimedia" instructions and maybe a bit more. Worth tossing THUMB-EE in this bag too. > > > config THUMB2_KERNEL > bool "Compile the kernel in Thumb-2 > mode" > - depends on CPU_V7 && > EXPERIMENTAL > + depends on CPU_V7 && !CPU_V6 > && EXPERIMENTAL > select AEABI > select ARM_ASM_UNIFIED > help > -- > 1.7.1 > > -- > To unsubscribe from this list: send the line "unsubscribe > linux-omap" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
