Dave, on the use of multiple sources.list entries:
Note that http://mojo.handhelds.org/hasty-armv6el-vfp/ only cascades deb-src 
entries.  We discussed the idea of another archive, but this is quite a stretch 
to setup and maintain; of course you need infrastructure (disk space, buildds, 
bandwidth etc.), but also it needs maintenance (watching the builds), separate 
QA, and is quite confusing to end users.  Ideally, you also want a mechanism to 
prevent mismatches of packages on target systems.  The way to do this would be 
to add subarch support to dpkg/apt and enforce subarch equality when installing 
binary packages (the subarch of the binary package needs to match the subarch 
of the system).

[Note that the mojo folks "abused" the "arm" port; AFAIK they built
binaries for EABI using "arm" as Debian architecture, so they offer
.debs which dpkg will allow to install on a Debian arm install despite
being another ABI.  That was the easiest path to get these interesting
archives, but it breaks ABI, so not something to do officially IMO.
What's possible however is to rebuild the armel archive with higher CPU
requirements, keeping the same ABI.]

-- 
armel gcc default optimisations
https://bugs.launchpad.net/bugs/303232
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