[U-Boot-Users] linking u-boot for mips little endian w/ hardhat tools.

[Charles Eidsness]

Hi Mike,

If you change the file format to tradlittlemips then you'll also need to 
compile using the little endian flag (-EL) instead of the default big 
endian flag (-EB) flag. If you haven't already you'll probably have to 
do something like this:

--- cpu/mips/config.mk	2003-06-27 17:32:33.000000000 -0400
+++ cpu/mips/config.mk	2004-10-04 16:09:31.612045528 -0400
@@ -21,4 +21,4 @@
  # MA 02111-1307 USA
  #

-PLATFORM_CPPFLAGS += -mcpu=4kc -EB -mabicalls
+PLATFORM_CPPFLAGS += -mcpu=4kc -EL -mabicalls

Hope that helps,
Charles

C Michael Sundius wrote:
> Hi,
> 
> I am trying to port u-boot to a system w/ a mips 4kc little endian processor.
> 
> in looking at other cpu/boards to use as a starting point/template, I chose 
> the tb0229 board as it looked to also be a 4kc little endian cpu.
> 
> when I build, I get the an undefined reference to _GLOBAL_OFFSET_TABLE_.
> 
> I did some fiddling aroud, and comparing to linker command files for other 
> boards and I found that the line:
> 
> 	OUTPUT_FORMAT("elf32-tradlittlemips", "elf32-tradlittlemips",\ 
> 				"elf32-tradlittlemips")
> 
> if changed to:
> 
> 	OUTPUT_FORMAT("elf32-tradbigmips", "elf32-tradbigmips", "elf32-tradbigmips")
> 
> will allow me to compile and link fine...
> 
> my question is then:
> 
> 1) what does this really do?
> 2) if I'm using a little endian cpu, do I really need it set to 
> elf32-tradlittlemips?
> 3) if so how do I solve my problem?
> 4) if not why?
> 
> one more note the compiler/toolchain that I'm using is from montavista, the -v 
> option displays the following:
> 
> ======================================
>  mips_fp_le-gcc -v
> Reading specs from /opt/hardhat/devkit/mips/fp_le/lib/gcc-lib/
> mipsel-hardhat-linux/3.2.1/specs
> Configured with: ../configure --host=i686-pc-linux-gnu 
> --target=mipsel-hardhat-linux --prefix=/opt/hardhat/devkit/mips/fp_le 
> --exec-prefix=/opt/hardhat/devkit/mips/fp_le --bindir=/opt/hardhat/devkit/
> mips/fp_le/bin --sbindir=/opt/hardhat/devkit/mips/fp_le/sbin --sysconfdir=/
> opt/hardhat/devkit/mips/fp_le/etc --datadir=/opt/hardhat/devkit/mips/fp_le/
> share --includedir=/opt/hardhat/devkit/mips/fp_le/include --libdir=/opt/
> hardhat/devkit/mips/fp_le/lib --libexecdir=/opt/hardhat/devkit/mips/fp_le/
> libexec --localstatedir=/opt/hardhat/devkit/mips/fp_le/var --sharedstatedir=/
> opt/hardhat/devkit/mips/fp_le/share --mandir=/opt/hardhat/devkit/mips/fp_le/
> man --infodir=/opt/hardhat/devkit/mips/fp_le/info 
> --program-transform-name=s,^,mips_fp_le-, --enable-cross 
> --with-gxx-include-dir=${prefix}/mipsel-hardhat-linux/include/g++-v3 
> --enable-shared --enable-languages=c,c++ --enable-threads=posix 
> --enable-__cxa_atexit --disable-multilib
> Thread model: posix
> gcc version 3.2.1 20020930 (MontaVista)
> =======================================
> 
> thanks for any help you can offer...(sorry this is maybe more of a tool 
> related question, but monta vista has not been much help as of yet).
> 
> Mike
> ~       
> 
> 
> 
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