[U-Boot] Make error in U-boot branch v2015.10-rc5

[Arunashis Ghose]

Many thanks for Chris and Alex. It was quite stupid of me not to set the environment variable for the cross compiler. After setting it, I was able to build it.
________________________________
From: Chris Packham <judge.packham at gmail.com>
Sent: Saturday, April 21, 2018 6:26 AM
To: Arunashis Ghose
Cc: u-boot
Subject: Re: [U-Boot] Make error in U-boot branch v2015.10-rc5



On Fri, 20 Apr 2018, 10:55 PM Arunashis Ghose, <hindol96 at outlook.com<mailto:hindol96 at outlook.com>> wrote:
Hi,

Thanks for reading this email and I would be grateful if you have time to help me fix the issue.

I am very much new to U-boot world and trying to build U-boot in my machine for a particular board - 'Marvel Armada 38x'. While I was trying to compile the u-boot fork for Marvel (in github), I got following error:

You may want to take a look at the db-88f6820-gp, db-88f6820-amc or clearfog boards. These are in both the Marvell fork and in u-boot proper.


---------------------------------------------------------------------------
**** [Building U-BOOT]    *****

cc1: error: bad value (armv7-a) for -march= switch
cc1: error: bad value (armv7-a) for -march= switch
lib/asm-offsets.c:1:0: error: bad value (armv7-a) for -march= switch
 /*
 ^
Makefile:716: recipe for target 'lib/asm-offsets.s' failed
make: *** [lib/asm-offsets.s] Error 1
make: *** Waiting for unfinished jobs....

 *** Error: Build failed
---------------------------------------------------------------------------

I couldn't figure out what is causing it and a way to fix it.

Then I thought I would try to build u-boot original. I checked out the branch v2015.10-rc5 of u-boot and tried to build it for board - 'bananapro' (a random choice). I got a similar error:

---------------------------------------------------------------------------
$ make Bananapro_config
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/zconf.lex.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
#
# configuration written to .config
#
$ make all
scripts/kconfig/conf  --silentoldconfig Kconfig
  CHK     include/config.h
  UPD     include/config.h
  GEN     include/autoconf.mk<http://autoconf.mk>
  GEN     include/autoconf.mk.dep
  GEN     spl/include/autoconf.mk<http://autoconf.mk>
  CHK     include/config/uboot.release
  UPD     include/config/uboot.release
  CHK     include/generated/version_autogenerated.h
  UPD     include/generated/version_autogenerated.h
  CHK     include/generated/timestamp_autogenerated.h
  UPD     include/generated/timestamp_autogenerated.h
  CC      lib/asm-offsets.s
lib/asm-offsets.c:1:0: error: bad value (armv5) for -march= switch
 /*
 ^
Kbuild:43: recipe for target 'lib/asm-offsets.s' failed
make[1]: *** [lib/asm-offsets.s] Error 1
Makefile:1251: recipe for target 'prepare0' failed
make: *** [prepare0] Error 2
---------------------------------------------------------------------------

Can anyone give me a clue? Thanks a lot.

You need to tell the build to use a cross compiler. I.e

export CROSS_COMPILE=arm-linux-gnueabi-
make db-88f6820-gp_defconfig
make

You'll need a reasonably new version of gcc to compile u-boot for arm (for size reasons mostly). Depending on your distro there might be a package you can install otherwise there is the excellent service from bootlin (formerly free-electrons)

https://toolchains.bootlin.com/

The Linux kernel community also publish cross toolchains for various architectures

https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/7.3.0/

I believe it's possible to use u-boot's buildman tool to install these but I'm traveling at the moment so I can't look up the details on that.

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