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(ARM-specific) Allow use of arm-linux-gcc built with NWFPE emulation to compile U-Boot

PATCH New Ulf Samuelsson 2 participants 2 messages Mar 26, 2007 – Apr 2, 2007

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Ulf Samuelsson

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PATCH 1/1 (ARM-specific) Allow use of arm-linux-gcc built with NWFPE emulation to compile U-Boot

Author: Ulf Samuelsson
Date: 2007-03-27

Description:

Change "-msoftfloat" to $(SOFTFLOAT) for
arm920t
arm926ejs

This allows an arm toolchain using floating point emulation for these cores to build u-boot.
When -msoftfloat is present as a flag to arm-linux-gcc, the build fails.

The default operation is to keep -msoftfloat but if CONFIG_NOSOFTFLOAT is defined as an environment variable in the shell, the -msoftfloat is removed during the build

Example:

	$ export CONFIG_NOSOFTFLOAT=y
	$ make <board>_config
	$ make
Signed-off-by Ulf Samuelsson
config.mk +6 -0
diff -urN u-boot-2007-03-26/config.mk u-boot-2007-03-26-atmel/config.mk
@@ -73,6 +73,12 @@
 PLATFORM_CPPFLAGS+= -D__BLACKFIN__
 endif
 
+ifeq ($(CONFIG_NOSOFTFLOAT),)
+SOFTFLOAT = -msoft-float
+else
+SOFTFLOAT =
+endif
+
 ifdef	ARCH
 sinclude $(TOPDIR)/$(ARCH)_config.mk	# include architecture dependend rules
 endif

diff -urN u-boot-2007-03-26/cpu/arm920t/config.mk
u-boot-2007-03-26-atmel/cpu/arm920t/config.mk
--- u-boot-2007-03-26/cpu/arm920t/config.mk 2007-03-26
22:52:54.000000000 +0200
+++ u-boot-2007-03-26-atmel/cpu/arm920t/config.mk 2007-03-26
22:54:03.000000000 +0200
@@ -22,7 +22,7 @@
#

PLATFORM_RELFLAGS += -fno-strict-aliasing -fno-common -ffixed-r8 \
- -msoft-float
+ $(SOFTFLOAT)

PLATFORM_CPPFLAGS += -march=armv4
# =========================================================================
diff -urN u-boot-2007-03-26/cpu/arm926ejs/config.mk u-boot-2007-03-26-atmel/cpu/arm926ejs/config.mk
--- u-boot-2007-03-26/cpu/arm926ejs/config.mk 2007-03-26
22:52:54.000000000 +0200
+++ u-boot-2007-03-26-atmel/cpu/arm926ejs/config.mk 2007-03-26
22:54:03.000000000 +0200
@@ -22,7 +22,7 @@
#

PLATFORM_RELFLAGS += -fno-strict-aliasing -fno-common -ffixed-r8 \
- -msoft-float
+ $(SOFTFLOAT)

PLATFORM_CPPFLAGS += -march=armv4
# =========================================================================

Signature · 10 lines
Best Regards,
Ulf Samuelsson

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#1 lore raw

PATCH 1/1 (ARM-specific) Allow use of arm-linux-gcc built with NWFPE emulation to compile U-Boot

Quoted 16 lines

-----Original Message-----
From: u-boot-users-bounces at lists.sourceforge.net [mailto:u-boot-users-bounces at lists.sourceforge.net] On Behalf Of Ulf Samuelsson
Sent: 26 March 2007 22:50
To: uboot
Subject: [U-Boot-Users] [PATCH] (ARM-specific) Allow use of arm-linux-gcc built with NWFPE emulation to compile U-Boot

Author: Ulf Samuelsson
Date: 2007-03-27

Description:

Quoted 8 lines

Change "-msoftfloat" to $(SOFTFLOAT) for
arm920t
arm926ejs

This allows an arm toolchain using floating point emulation for these cores to build u-boot.
When -msoftfloat is present as a flag to arm-linux-gcc, the build fails.

Ulf

Thanks for your patch. It will be useful for others, with the same
problem, to see your post.

However, I shall not be submitting it for inclusion in the main U-Boot tree.

The compiler warning indicates a toolchain problem, rather than a problem in the U-Boot code.

The latest ELDK arm-linux-gcc does not exhibit this behaviour.

Since U-Boot contains no floating point code, I intend to remove
this option from all

ARM board builds, as soon as possible.

"
<---- snip ----->
.....I consider the use of FP code in U-Boot a bug. <---- snip ----->
WD 2007-03-26"

I would be interested to hear from users of other architectures

why this flag is required for their builds.....

Regards

Peter Pearse