Code review comment for lp:~mabac/linaro-image-tools/snowball-support

Branch looks good to me; since you removed the sample toc file and since I don't think we have support in linaro-hwpack-create for TOCs, I would suggest you add some explanation under doc/ on how the toc file and on repacking hwpacks with such a file; e.g. a doc/snowball-emmc-hwpacks.txt or something like that which would say something like:
===
hwpacks for use with --dev snowball-emmc need a file called toc.cfg at the root of the tarball, but this isn't yet supported by linaro-hwpack-create; repack the hwpack by unpacking the tarball, adding the toc file and the files it references at the root of the tarball and repack the tarball. The TOC file has this format:
<sample TOC file>
===

or file a bug to remind ourselves about this lack of support for toc files in linaro-hwpack-create or lack of documentation on working around it