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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-09 11:01:24 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-20 11:05:09 +0400
commit4e63f8edfe4d6f20b1af176efc022c2b2f5e7aeb (patch)
tree5fd40bcbe3b23b8c055e1f8bd543ec125c9f98d6 /arch/powerpc/Kconfig
parent04ae9001719c3f0012d239a7c5aa4136f6b6541d (diff)
downloadlinux-4e63f8edfe4d6f20b1af176efc022c2b2f5e7aeb.tar.xz
powerpc/math-emu: Allow math-emu to be used for HW FPU
(Including 64-bit ones) This allow SW emulation by the kernel of optional instructions such as fsqrt which aren't implemented on some processors, and thus fixes some Fedora 19 issues such as Anaconda since the compiler is set to generate those by default on 64-bit. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Kconfig')
-rw-r--r--arch/powerpc/Kconfig6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c33e3ad2c8fd..e3009abc7f75 100644
--- 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