[coreboot] build failure: cannot move location counter backwards

[Cristian Măgherușan-Stanciu]

Hi,

You need to use our cross-compiler. Run 'make crossgcc' in the
coreboot directory and you will get our reference toolchain compiled.
Then run 'make' once again and everything should compile.

I will try to fix the doc if this is missing from there.

Cristi