yes, I have a CL for that. But I get an error when using Lumpy as one of the targets. Have not have time to work on it. Will fix soon. 

Ok, I see Yunlian has created the exact same CL as I did so I will let him own this problem. It seems I am just getting in the way.

I wonder if we can use lumpy instead of amd64-generic (in addition to replace x86-generic). It would be nice to reduce the time needed by chromiumos-sdk builder.

Any update on this?

The CL https://chromium-review.googlesource.com/c/556403/ is in commit queue now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/chromite/+/828315a8fd879bb1cf285141d7ae996ea1a6c510

commit 828315a8fd879bb1cf285141d7ae996ea1a6c510
Author: Yunlian Jiang <yunlian@google.com>
Date: Thu Jul 06 20:59:21 2017

chromiumos-sdk: use lumpy to replace x86-generic in test.

We have deprecated x86 boards, so we can remove x86-generic from
chromiumos-sdk now. We added lumpy because it contains some au
code built with i686 toolchain.

BUG= chromium:738137 
TEST=run_test passes.

Change-Id: I1479d30eef65d940f265ec995db7ec181642a2ff
Reviewed-on: https://chromium-review.googlesource.com/556403
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[modify] https://crrev.com/828315a8fd879bb1cf285141d7ae996ea1a6c510/cbuildbot/config_dump.json
[modify] https://crrev.com/828315a8fd879bb1cf285141d7ae996ea1a6c510/cbuildbot/chromeos_config.py

chromiumos-sdk bot is green now.