[U-Boot] [PATCH v1 6/7] MIPS: u-boot.lds: add relocation specific sections

[Gabor Juhos <juhosg@openwrt.org>]

> that's weird. Actually I checked after each patch if the *_end symbols
> match the U-Boot binary size. Now I checked again with different
> toolchains (gcc-4.[5,6,7], binutils-2.[21.53,22] and I have again that
> binutils issue.
> 
> But all toolchains have one in common (tested with qemu_mips):
> __rel_dyn_end - __rel_dyn_start = 0x1770
> size from readelf = 0x15f8
> 
> Another problem is that your .deadcode workaround does not work
> anymore for me. It does not matter how I arrange or drop the unneeded
> sections, the size of .rel.dyn remains at 0x1770. I'll try to find
> another solution.

Erm, the presence of the .deadcode section does not change the size of the
.rel.dyn section.

The ELF headers shows that there is a gap between the .rel.dyn and the .deadcode
section:

  [ 6] .rel.dyn          REL             bfc30804 030864 0015f8 08   A  8   0  4
  [ 7] .deadcode         PROGBITS        bfc31f74 031fd4 000004 00  WA  0   0  1

However objcopy will copy the .deadcode section into the final binary because it
is placed after the .rel.dyn section, and the gap will be filled with 0xff bytes.

As a result, the size of u-boot.bin will equal to (__rel_dyn_end - __start + 4),
and this ensures that it will contain the full .rel.dyn section.

$ ls -l u-boot.bin
-rw-r--r-- 1 juhosg root 204664 Feb 11 14:46 u-boot.bin

This is with the attached patch applied on top of the mips/reloc branch.

-Gabor