bernds_cb1 at t-online.de
Thu Jun 5 00:34:52 UTC 2008
Denys Vlasenko wrote:
> I want to do it in "Linux from scratch" style. This way,
> I will get better understanding of the way it is done,
> and possibly stumble upon rough edges in busybox,
> uclubc, etc. This will lead to "itch scratching"
> and bug fixing.
It will also lead to unnecessary pain.
> elf binaries, it says "BINFMT_FLAT: bad magic/rev (0x1010100, need 0x5)".
One thing I just remembered is that we used to have non-standard flat
files. Version 5 doesn't exist in any tools/kernels other than ancient
Blackfin distributions. Our tools were fixed long ago to generate
version 4 flat binaries. With a modern toolchain you can't actually
produce binaries that will run on the 2005 kernel you're using (never
mind that it's totally bug-infested anyway), so please upgrade that
first. There's a u-boot installed on your board, surely?
> To be honest, building it was somewhat contrived - I copied the directory
> into binutils' build dir and gave it all necessary configure parameters,
> and it still could not find e.g. elf/bfin.h - had to add some include paths
> by hand. (Do you want a more detailed report about this?)
No. Use the buildscript or look at how it does things.
> Looking into ld-elf2flt makes me doubtful -
> "LINKER="$0.real" # the original renamed-linker" - really? It will rename
> my linker and replace it by itself?
Yes. There'll be bfin-uclinux-ld and bfin-uclinux-ld.real, the former
being the ld-elf2flt script which in turn calls the real ld and the
> This script looks rather contrived,
> will it really work correctly for all possible invocations of ld which
> don't even want to do any elf2flt-ification?
So far we've not had reports to the contrary.
> Can you write up a small explanation what elf2flt does, how to produce
> a flat executable with it? Let's say in my situation - I seem to have
> correctly built static elf bfin busybox, can I make a flat one out of it?
Nope. It's lacking the relocs.
> What is this ld-elf2flt wrapper - what is it doing?
Calling ld and elf2flt in a way to generate correct flat binaries.
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