RE: [microblaze-uclinux] Building microblaze toolchain

[Scott Thibault <thibault@xxxxxxxxxx>]

> > In my continued quest to build microblaze uClinux executables on 
> > Windows, I'm trying to build the tool chain with MinGW.  I 
> tried using 
> > the EDK 6.3 cross-compiler, but I get a bad magic error 
> when trying to 
> > load them under uClinux.  I'm guessing here that there are some 
> > version differences between the uClinux and the EDK toolchain.
> 
> Nothing so serious - to build uClinux executables you have to use a 
> special little tool called elf2flt - it converts elf binaries into so 
> called "flat binaries" with relocation information.
> 
> Here's what to do - in your edk6.3 toolchain, rename mb-ld to 
> mb-ld.real, and copy the mb-ld file from a linux toolchain.  It's 
> actually a script, so it should run just fine under some sort of *n*x 
> emulation.
> 
> This script is a wrapper that runs elft2flt if necessary, and passes 
> files on to the real linker (mb-ld.real).

I initially tried using -W,l-elf2flt with the EDK, and it outputs a
warning like: ld-elf2flt cannot find entry point: assuming 00000000.
So, it seemed like the EDK supported -elf2flt.  Of course, as I said,
uClinux couldn't load the binary reporting a bad magic error.

> 
> Then grab the elf2flt sources from cvs.uclinux.org - 
> configure and build 
> it, put it in your toolchain bin directory renamed as mb-elf2flt
> 
> The configuration is a little tricky, you have to point it at various 
> BFD and libiberty headers and libs that are produced when you 
> build the 
> binutils.  ./configure --help will tell you the options you 
> need to provide.

I did that.  That is why I was trying to build binutils, to get the libs
it was looking for.

> > In any case, the Web site references a build_toolchain script file, 
> > but I can't find it anywhere.  Where do I get this file?
> 
> You'll need to specify target=microblaze...
> 

But what do I put after microblaze?  Maybe microblaze-mingw32?
According to the help it needs to match that used to build binutils.  I
suppose maybe I can try to use the EDK libraries and search the binaries
to see if they contain the target name somewhere.

--Scott

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