[ECOS] Making an Ecos Kernel suitable for Hello World (minimalist) situations.

["Warren Postma" <warren dot postma at adaptivenetworks dot on dot ca>]

I built a default Nano target environment using the graphical build tools.
When I build the usual hello world C program, I get a 3.2 megabyte
monstrosity.

arm-elf-gcc \
  -T/nano_install/lib/target.ld \
  -Wl,--gc-sections -Wl,-static \
  -g -O2 -nostdlib \
  -L/nano_install/lib \
  -I/nano_nstall/include \
  hello.c -o hello.exe

Most of that is obviously ECOS.  Out of that, how do I find out how much
space the EXE is actuall taking on the target, and could I estimate how much
is HAL, TCPIP, PCI libs, and so on?

So I did a minimal build, and relinked with "nano_mini_install/lib", and I
got a very respectable 108118 byte executable.  Now, how would I find out
how much of that EXE is actually flat space?

Unfortunately, minimal is not enough for a working printf(), which I
consider rather essential.  Attempts to debug the 110K hello.c crash, so I
assume that the printf() call is not working, and yet no link errors were
made.  However the nano_mini.ecc file doesn't appear to include the mini c
libraries.

What do I have to type to add the C libraries into minimal?  And is minimal
really minimal or can I remove something else?

Also, does anyone know how to build something Even More Minimal than the
Minimal Template?  All I need is a working Nano Target (I assume the HAL is
100% necessary), and printf() support.

Regards,

Warren



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