powerpc/math-emu: Allow math-emu to be used for HW FPU

[deliverable/linux.git] / arch / powerpc / Kconfig

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c33e3ad2c8fd52c9e0c31dfc272faf3d34902f37..e3009abc7f75b4bface80915dcaf847554cc8fd6 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -298,7 +298,7 @@ config HUGETLB_PAGE_SIZE_VARIABLE
 
 config MATH_EMULATION
        bool "Math emulation"
-       depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
+       depends on 4xx || 8xx || PPC_MPC832x || BOOKE
        ---help---
          Some PowerPC chips designed for embedded applications do not have
          a floating-point unit and therefore do not implement the
@@ -307,6 +307,10 @@ config MATH_EMULATION
          unit, which will allow programs that use floating-point
          instructions to run.
 
+         This is also useful to emulate missing (optional) instructions
+         such as fsqrt on cores that do have an FPU but do not implement
+         them (such as Freescale BookE).
+
 config PPC_TRANSACTIONAL_MEM
        bool "Transactional Memory support for POWERPC"
        depends on PPC_BOOK3S_64