Mini howto build toolschain and initramfs on Linux

I got some errors when build the cross tool chain

1.

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src is from linux2nios CD->GUNSRC.TGZ

binutils->OK

gcc->error

elf2flt->OK

here is the gcc error:

 rule to make target `../../../gcc/gcc/config/nios2/lib2-divmod.c', needed by 
`libgcc.mk'.  Stop.
make: Leaving directory `/usr/local/src/nios2/build/gcc/gcc'
make: ***  Error 2

2.

==================================================

windows_src:

binutils->error

gcc->ok

elf2flt->ok

here is the gcc error

...
checking whether ANSI C string concatenation works ... yes
*** ld does not support target nios2-elf
*** see ld/configure.tgt for supported targets
make: ***  Error 1

3.

==================================================

I fount the size of nios2-elf-gcc ar ld ... form inux2nios CD->GUNBIN.TGZ is

larger than the ones that I built out.

i.e.

GUNBIN.TGZ->nios2-elf-gcc 409,858 byte

/usr/local/bin/nios2-elf-gcc 269,679 byte( which is I built out)

but I tested both of them could worke well. Why? Is it the static-library and

dynamic-library?

4.

==================================================

I cannot built out /usr/local/nios2-elf/lib (there are libm.a libc.a ...) and

/usr/local/nios2-elf/include (some *.h files used for C)

In which step are they during building cross tool chain?