[Buildroot] elf2flt blues

[Buildroot] elf2flt blues

[Erland Lewin]

Hello,

I'm trying to build buildroot for the Olimex LPC2478-STK development
card<http://www.olimex.com/dev/lpc-2478stk.html>(with an arm7TDMI
core), for a patched Linux-2.6.24 kernel that came with
the card.

I'm having lots of problems, and would really appreciate it if someone
could point me in the right direction.

I managed to build buildroot, but then it failed to execute on the board,
and I think it because the kernel only supports BFLT, not ELF.

So I selected 'elf2flt support?' in the Buildroot 2012.02 configurator.
Should I have to do something else to have elf2flt automatically run during
linking?

I have a problem linking elf2flt:

gcc -g -O2 -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\"
> -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\"
> -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1
> -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1
> -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_FCNTL_H=1 -DHAVE_UNISTD_H=1
> -DHAVE_BFD_H=1  -DTARGET_arm -I/bfd/
> -I/home/erl/src/LPC2478/buildroot-2012.02/output/build/binutils-2.21.1/include/
> -lz -o flthdr
> /home/erl/src/LPC2478/buildroot-2012.02/output/toolchain/elf2flt/flthdr.c
> /bfd/libbfd.a /libiberty/libiberty.a
> gcc: /bfd/libbfd.a: No such file or directory
> gcc: /libiberty/libiberty.a: No such file or directory
> gcc: /bfd/libbfd.a: No such file or directory
> gcc: /libiberty/libiberty.a: No such file or directory


elf2flt was configured with:

rm -rf config.cache; \
> LDFLAGS=-lz \
> /home/erl/src/LPC2478/buildroot-2012.02/output/toolchain/elf2flt/configure
>  \
> --with-bfd-include-dir=/bfd/ \
> --with-binutils-include-dir=/home/erl/src/LPC2478/buildroot-2012.02/output/build/binutils-2.21.1/include/
> \
> --target=arm-unknown-linux-uclibcgnueabi \
> --with-libbfd=/bfd/libbfd.a \
> --with-libiberty=/libiberty/libiberty.a \
>
> --prefix=/home/erl/src/LPC2478/buildroot-2012.02/output/host/usr/arm-unknown-linux-uclibcgnueabi/sysroot/usr


I see that I have four different versions of libbfd.a:

./output/target/usr/lib/libbfd.a
./output/build/binutils-2.21.1/bfd/libbfd.a
./output/build/host-binutils-2.21.1/bfd/libbfd.a
./output/host/usr/arm-unknown-linux-uclibcgnueabi/sysroot/usr/lib/libbfd.a

I try to rerun configure manually with:

./configure '--with-libbfd=../../build/host-binutils-2.21.1/bfd/libbfd.a'
> '--with-bfd-include-dir=../../build/host-binutils-2.21.1/bfd'
> '--with-libiberty=../../host/usr/lib/libiberty.a'
> '--prefix=/home/erl/src/LPC2478/buildroot-2012.02/output/host/usr/arm-unknown-linux-uclibcgnueabi/sysroot/usr'
> 'LDFLAGS=-lz' 'target_alias=arm-unknown-linux-uclibcgnueabi'


Note that I also seem to have had to add a target_alias flag.

I succeed in building elf2flt. When I try to run it manually on my busybox
executable, I get:

$ ./elf2flt -v ../../target/bin/busybox -o ./busybox
> ../../target/bin/busybox: Input file contains no relocation info


After googling, I think I have to build all apps with the '-r' flag to gcc
to add relocation info (see
http://www.mail-archive.com/uclinux-dev at uclinux.org/msg00659.html).

I'm not sure where to add the '-r' in the buildroot configurator, so I
added it after '-pipe' in BR2_TARGET_OPTIMIZATION.

I then get an error building busybox:

/home/erl/src/LPC2478/buildroot-2012.02/output/host/usr/lib/gcc/arm-unknown-linux-uclibcgnueabi/4.5.3/../../../../arm-unknown-linux-uclibcgnueabi/bin/ld:
> gc-sections requires either an entry or an undefined symbol


I commented out -gc-sections from scripts/trylink and rebuilt.

I now get errors building binutils:

>  /home/erl/src/LPC2478/buildroot-2012.02/output/host/usr/bin/arm-unknown-linux-uclibcgnueabi-gcc
> -c -DHAVE_CONFIG_H -pipe -r -Os   -I. -I./../include  -W -Wall
> -Wwrite-strings -Wc++-compat -Wstrict-prototypes -pedantic  -fPIC
> ./pex-common.c -o pic/pex-common.o; \
> else true; fi
> ./physmem.c: In function 'physmem_total':
> ./physmem.c:96:23: error: storage size of 'pss' isn't known
> ./physmem.c:97:5: warning: implicit declaration of function
> 'pstat_getstatic'
> ./physmem.c:96:23: warning: unused variable 'pss'
> ./physmem.c: In function 'physmem_available':
> ./physmem.c:200:23: error: storage size of 'pss' isn't known
> ./physmem.c:201:24: error: storage size of 'psd' isn't known
> ./physmem.c:203:2: warning: implicit declaration of function
> 'pstat_getdynamic'
> ./physmem.c:201:24: warning: unused variable 'psd'
> ./physmem.c:200:23: warning: unused variable 'pss'
> make[3]: *** [physmem.o] Error 1


I think I'll start over and rebuild it from scratch (the third time). I'd
appreciate any hints.

Thanks!
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[Buildroot] [PATCH] elf2flt: fix after conversion of binutils to package infrastructure

[Arnout Vandecappelle]

When binutils was converted to the package infrastructure (commit
009407e6b), the variable that elf2flt uses to find the binutils
libraries disappeared.  So use HOST_BINUTILS_DIR instead of
BINUTILS_DIR1.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
---
Note that elf2flt has been broken for one and a half years now before
anybody has complained about it...

Probably it should be converted to autotargets as well.  However, I
don't know how to test if the resulting tool still works.

 toolchain/elf2flt/elf2flt.mk |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/toolchain/elf2flt/elf2flt.mk b/toolchain/elf2flt/elf2flt.mk
index e74a655..84a2c01 100644
--- a/toolchain/elf2flt/elf2flt.mk
+++ b/toolchain/elf2flt/elf2flt.mk
@@ -21,12 +21,12 @@ $(ELF2FLT_DIR)/.configured: $(ELF2FLT_DIR)/.patched
 	(cd $(ELF2FLT_DIR); rm -rf config.cache; \
 		LDFLAGS=-lz \
 		$(ELF2FLT_DIR)/configure $(QUIET) \
-		--with-bfd-include-dir=$(BINUTILS_DIR1)/bfd/ \
-		--with-binutils-include-dir=$(BINUTILS_DIR)/include/ \
+		--with-bfd-include-dir=$(HOST_BINUTILS_DIR)/bfd/ \
+		--with-binutils-include-dir=$(HOST_BINUTILS_DIR)/include/ \
 		--target=$(REAL_GNU_TARGET_NAME) \
-		--with-libbfd=$(BINUTILS_DIR1)/bfd/libbfd.a \
-		--with-libiberty=$(BINUTILS_DIR1)/libiberty/libiberty.a \
-		--prefix=$(STAGING_DIR)/usr)
+		--with-libbfd=$(HOST_BINUTILS_DIR)/bfd/libbfd.a \
+		--with-libiberty=$(HOST_BINUTILS_DIR)/libiberty/libiberty.a \
+		--prefix=$(HOST_DIR)/usr)
 	touch $@
 
 $(ELF2FLT_DIR)/$(ELF2FLT_BINARY): $(ELF2FLT_DIR)/.configured
-- 
tg: (ccb44fd..) t/elf2flt (depends on: master)

[Buildroot] [PATCH] elf2flt: fix after conversion of binutils to package infrastructure

[Thomas Petazzoni]

Le Sun, 18 Mar 2012 16:35:58 +0100,
"Arnout Vandecappelle (Essensium/Mind)" <arnout@mind.be> a ?crit :

> Probably it should be converted to autotargets as well.  However, I
> don't know how to test if the resulting tool still works.

I have started setting up an environment for a noMMU ARM kernel and
userspace that runs under the SkyEye emulator. I intend to clean this
up and make it available as a defconfig so that we have at least one
noMMU environment we can use for testing.

So far I have something that boots into a Busybox userspace, but it is
built with the Soucery CodeBench uClinux toolchain. I think I will
clean it up as is, we can see later if the internal toolchain backend
works to build a correct toolchain for this usecase.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

[Buildroot] [PATCH] elf2flt: fix after conversion of binutils to package infrastructure

[Peter Korsgaard]

>>>>> "Thomas" == Thomas Petazzoni <thomas.petazzoni@free-electrons.com> writes:

Hi,

 >> Probably it should be converted to autotargets as well.  However, I
 >> don't know how to test if the resulting tool still works.

 Thomas> I have started setting up an environment for a noMMU ARM kernel and
 Thomas> userspace that runs under the SkyEye emulator. I intend to clean this
 Thomas> up and make it available as a defconfig so that we have at least one
 Thomas> noMMU environment we can use for testing.

 Thomas> So far I have something that boots into a Busybox userspace, but it is
 Thomas> built with the Soucery CodeBench uClinux toolchain. I think I will
 Thomas> clean it up as is, we can see later if the internal toolchain backend
 Thomas> works to build a correct toolchain for this usecase.

Great, sounds good. I don't have any experience with skyeye, any
specific reasons to use that instead of qemu?

-- 
Bye, Peter Korsgaard

[Buildroot] [PATCH] elf2flt: fix after conversion of binutils to package infrastructure

[Peter Korsgaard]

>>>>> "Arnout" == Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> writes:

 Arnout> When binutils was converted to the package infrastructure (commit
 Arnout> 009407e6b), the variable that elf2flt uses to find the binutils
 Arnout> libraries disappeared.  So use HOST_BINUTILS_DIR instead of
 Arnout> BINUTILS_DIR1.

Committed, thanks.

-- 
Bye, Peter Korsgaard

[Buildroot] [PATCH] elf2flt: fix after conversion of binutils to package infrastructure

[Thomas Petazzoni]

Hello,

Le Sun, 18 Mar 2012 20:47:14 +0100,
Peter Korsgaard <jacmet@uclibc.org> a ?crit :

> Great, sounds good. I don't have any experience with skyeye, any
> specific reasons to use that instead of qemu?

I might have missed something, but I haven't found any of the ARM
platforms emulated by Qemu to be noMMU platforms. I have tried to build
a kernel for the Versatile platform with MMU disabled, but the build
fails. It seems that the kernel does not support to be built for any
platform with MMU disabled, though I might be wrong. If anyone knows
about one of the ARM platforms supported by Qemu to be supported in a
noMMU variant by the kernel, that would be nice.

I have also started to build a m68k kernel. This one starts booting in
Qemu, but the boot hangs with an "attempted to kill idle" panic.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com