The e300c2 core which is embedded in mpc832x CPU doesn't have
an FPU.
Make it possible to not select CONFIG_PPC_FPU when building a
kernel dedicated to that target.
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
arch/powerpc/kernel/head_32.S | 4 ++++
arch/powerpc/platforms/Kconfig.cputype | 11 +++++++++--
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index f3ab94d73936..588fe8644df6 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -413,6 +413,7 @@ Alignment:
. = 0x800
DO_KVM 0x800
FPUnavailable:
+#ifdef CONFIG_PPC_FPU
BEGIN_FTR_SECTION
/*
* Certain Freescale cores don't have a FPU and treat fp instructions
@@ -426,6 +427,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
b fast_exception_return
1: addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_LITE(0x800, kernel_fp_unavailable_exception)
+#else
+ b ProgramCheck
+#endif
/* Decrementer */
EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
diff --git a/arch/powerpc/platforms/Kconfig.cputype
b/arch/powerpc/platforms/Kconfig.cputype
index 40ffcdba42b8..d4fd109f177e 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -32,7 +32,7 @@ choice
config PPC_BOOK3S_6xx
bool "512x/52xx/6xx/7xx/74xx/82xx/83xx/86xx except 601"
select PPC_BOOK3S_32
- select PPC_FPU
+ imply PPC_FPU
select PPC_HAVE_PMU_SUPPORT
select PPC_HAVE_KUEP
select PPC_HAVE_KUAP
@@ -229,9 +229,16 @@ config PPC_FPU_REGS
bool
config PPC_FPU
- bool
+ bool "Support for Floating Point Unit (FPU)" if PPC_MPC832x
default y if PPC64
select PPC_FPU_REGS
+ help
+ This must be enabled to support the Floating Point Unit
+ Most 6xx have an FPU but e300c2 core (mpc832x) don't have
+ an FPU, so when building an embedded kernel for that target
+ you can disable FPU support.
+
+ If unsure say Y.
config FSL_EMB_PERFMON
bool "Freescale Embedded Perfmon"
--
2.25.0
