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Before this commit, weak symbols were not overridden by non-weak symbols
found in archive libraries when linking with recent versions of
binutils. As stated in the System V ABI, "the link editor does not
extract archive members to resolve undefined weak symbols".
This commit changes all Makefiles to use partial linking (ld -r) instead
of creating library archives, which forces all symbols to participate in
linking, allowing non-weak symbols to override weak symbols as intended.
This approach is also used by Linux, from which the gmake function
cmd_link_o_target (defined in config.mk and used in all Makefiles) is
inspired.
The name of each former library archive is preserved except for
extensions which change from ".a" to ".o". This commit updates
references accordingly where needed, in particular in some linker
scripts.
This commit reveals board configurations that exclude some features but
include source files that depend these disabled features in the build,
resulting in undefined symbols. Known such cases include:
- disabling CMD_NET but not CMD_NFS;
- enabling CONFIG_OF_LIBFDT but not CONFIG_QE.
Signed-off-by: Sebastien Carlier <sebastien.carlier@gmail.com>
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Using -fno-toplevel-reorder causes gcc to not reorder functions. This
ensures that an application's entry point will be the first function in
the application's source file.
This change, along with commit 620bbba524fbaa26971a5004793010b169824f1b
should cause a standalone application's entry point to be at the base of
the compiled binary. Previously, the entry point could change depending
on gcc version and flags.
Note -fno-toplevel-reorder is only available in gcc version 4.2 or
greater.
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
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Previously, standalone applications were compiled with gcc flags that
produced relocatable executables on the PowerPC architecture (eg with
the -mrelocatable and -fPIC flags). There's no reason for these
applications to be fully relocatable at this time since no relocation
fixups are performed on standalone applications.
Additionally, removing the gcc relocation flags results in the entry
point of applications residing at the base of the image. When
a standalone application was relocatable, the entry point was generally
located at an offset into the image which was confusing and prone to
errors.
This change moves the entry point of PowerPC standalone applications
from 0x40004 (usually) to 0x40000.
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Wolfgang Denk <wd@denx.de>
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Some versions of 'make' do not handle trailing white-spaces
properly. Trailing spaces in ELF causes a 'fake' source to
be added to the variable COBJS; leading to build failure
(listed below). The problem was found with GNU Make 3.80.
Using text-function 'strip' as a workaround for the problem.
make[1]: Entering directory `/home/sanjeev/u-boot/examples/standalone'
arm-none-linux-gnueabi-gcc -g -Os -fno-common -ffixed-r8 -msoft-float
-D__KERNEL__ -DTEXT_BASE=0x80e80000 -I/home/sanjeev/u-boot/include
-fno-builtin -ffreestanding -nostdinc -isystem /opt/codesourcery/2009q1-
203/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.3/include -pipe -DCONFIG_
ARM -D__ARM__ -marm -mabi=aapcs-linux -mno-thumb-interwork -march=armv5
-Wall -Wstrict-prototypes -fno-stack-protector -g -Os -fno-common -ff
ixed-r8 -msoft-float -D__KERNEL__ -DTEXT_BASE=0x80e80000 -I/home/sanje
ev/u-boot/include -fno-builtin -ffreestanding -nostdinc -isystem /opt/co
desourcery/2009q1-203/bin/../lib/gcc/arm-none-linux-gnueabi/4.3.3/includ
e -pipe -DCONFIG_ARM -D__ARM__ -marm -mabi=aapcs-linux -mno-thumb-inte
rwork -march=armv5 -I.. -Bstatic -T u-boot.lds -Ttext 0x80e80000 -o .c
arm-none-linux-gnueabi-gcc: no input files
make[1]: *** [.c] Error 1
make[1]: Leaving directory `/home/sanjeev/u-boot/examples/standalone'
make: *** [examples/standalone] Error 2
premi #
Signed-off-by: Sanjeev Premi <premi@ti.com>
Fixed typo (s/ElF/ELF/).
Signed-off-by: Wolfgang Denk <wd@denx.de>
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Clean up the arch/cpu/board/config checks as well as redundant setting of
srec/bin variables by using the kbuild VAR-$(...) style.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Rather than maintain/extend the current ifeq($(ARCH)) mess that exists in
the standalone Makefile, push the setting up of LOAD_ADDR out to the arch
config.mk (and rename to STANDALONE_LOAD_ADDR in the process). This keeps
the common code clean and lets the arch do whatever crazy crap it wants in
its own area.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Atmel DataFlashes by default operate with pages that are slightly bigger
than normal binary sizes (i.e. many are 1056 byte pages rather than 1024
bytes). However, they also have a "power of 2" mode where the pages show
up with the normal binary size. The latter mode is required in order to
boot with a Blackfin processor, so many people wish to convert their
DataFlashes on their development systems to this mode. This standalone
application does just that.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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The attached patch corrects an error in the examples/Makefile which
causes the applications in the examples directory to hang on OMAP3
based boards. The current Makefile sets -Ttext during linking to
0x0c100000 which is outside of addressable SDRAM memory. The script
corrects the existing ifeq...else...endif logic to look at the VENDOR
tag rather than the CPU tag.
The patch affects the following configs: omap3_beagle_config,
omap3_overo_config, omap3_evm_config, omap3_pandora_config,
omap3_zoom1_config and omap3_zoom2_config.
Signed-off-by: Michael Evans <horse_dung@hotmail.com>
Edited commit message.
Signed-off-by: Wolfgang Denk <wd@denx.de>
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The current files in examples are all standalone application examples,
so put them in their own subdirectory for organizational purposes
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
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