add cortex-r, dcc and panic-dcc to crates maintained by the cortex-r team

[japaric]

DCC (Debug Communication Channel) is a debug interface similar to Cortex-M's
ITM.

r? @rust-embedded/cortex-r

[thejpster]

Oh. Where I'm from, DCC is the official standard for digitally controlling model trains. Can we call this cortex-dcc or arm-dcc or debug-comm-channel, or something?

[paoloteti]

DCC = Dual-Clock Comparator on lockstep ARM devices. So, even if DCC is vendor specific and not from ARM, arm-dcc may be is not the best name too.

[eddyp]

But this code would support the arm/cortex implementation of dcc, so it should be OK, right?
BTW, I consider it a design flaw that cargo has a flat name space since name collisions can occur really easily. For instance, there is a git tool that predates Linus' vcs...

[japaric]

@thejpster if your goal is having the dcc crate be something DCCTRAIN related
I would suggest reserving the name on crates.io since anyone is free to take it.

Using arm-dcc seems fine to me. Debug Communication Channel is an ARM thing
since ARM7 / ARM9.

@paoloteti isn't Dual-Clock Comparator a TI specific thing? It doesn't show up
in https://developer.arm.com . If that deserves its own crate it could be named
ti-dcc.

At the end the name doesn't really tell you what the crate is about, the crate
description does.

I don't have a strong opinion on this one so I leave the decision up to
@paoloteti, the only other Cortex-R team member.

[paoloteti]

LGTM. Let's use arm-dcc

[japaric]

Renamed dcc to arm-dcc in the README.

@paoloteti you'll have to approve this PR again.

[japaric]

bors r=paoloteti

[bors]

👎 Rejected by label

[japaric]

sudo
bors r=paoloteti

[bors]

Build succeeded

• continuous-integration/travis-ci/push

[japaric]

The arm-dcc repository has been moved into the org: https://github.com/rust-embedded/arm-dcc