I have been making changes to incorporate the wilco EC and I suspect one of them resulted in this problem, but I can't figure out exactly how.

It is possible that ectool binary was actually building before when there was no ec build target, and now that I am trying to separate cros_ec from wilco_ec it is having problems because it is not building ectool anymore.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/board-overlays/+/485c94206c58d87e3612c5c6a36f74e43f55dffe

commit 485c94206c58d87e3612c5c6a36f74e43f55dffe
Author: Duncan Laurie <dlaurie@google.com>
Date: Sun Dec 16 08:58:51 2018

overlay-sarien: Add USE flag to disable ectool

Disable the cros_ec_utils flag for this board.

BUG= chromium:913766 
TEST=emerge-sarien chromeos-base/ec-utils

Change-Id: I8f6965a0ca677be0e922a4288929d542d64017b0
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1372165
Reviewed-by: Simon Glass <sjg@chromium.org>

[modify] https://crrev.com/485c94206c58d87e3612c5c6a36f74e43f55dffe/overlay-sarien/profiles/base/make.defaults

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/initramfs/+/e043793ce4968d66e0abfc27e4be9c976ba2ccb6

commit e043793ce4968d66e0abfc27e4be9c976ba2ccb6
Author: Duncan Laurie <dlaurie@google.com>
Date: Tue Dec 18 00:52:21 2018

initramfs: Conditionally include and use ectool

In order to support systems without Chromium EC the recovery script is
changed to look for the ectool binary before using it, and the build
system is changed to conditionally include the ectool binary only if
the "cros_ec" USE flag is set.

BUG= chromium:913766 
TEST="USE=factory_netboot_ramfs emerge-sarien chromeos-initramfs"
CQ-DEPEND=CL:1372284

Change-Id: I0c117cff5bed3dee2f79404c2392961faefe04dd
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1372266
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

[modify] https://crrev.com/e043793ce4968d66e0abfc27e4be9c976ba2ccb6/factory_netboot/Makefile
[modify] https://crrev.com/e043793ce4968d66e0abfc27e4be9c976ba2ccb6/recovery/recovery_init.sh

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/8596bac3b7c67577b61136ad935e83a7d01636bd

commit 8596bac3b7c67577b61136ad935e83a7d01636bd
Author: Duncan Laurie <dlaurie@google.com>
Date: Tue Dec 18 00:52:21 2018

ectool: Add separate USE flag for ectool

In order to support systems without ectool we need a flag that
explicitly indicates whether or not it should be present.  To
do this I split out the ectool build/install process and only
call those functions if the USE flag is enabled.

By default this flag is true, and it is disabled only on systems
that do not use the Chromium EC.

The new flag is also used by the initramfs ebuild to provide an
indication to the initramfs build system so it can include ectool
only if it is present instead of always expecting it to exist.

BUG= chromium:913766 
TEST="USE=factory_netboot_ramfs emerge-sarien chromeos-initramfs"
CQ-DEPEND=CL:1372266

Change-Id: Ia93ff56f07b23465d586cf9b5f7ac0d5b227a246
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1372284
Reviewed-by: Simon Glass <sjg@chromium.org>

[modify] https://crrev.com/8596bac3b7c67577b61136ad935e83a7d01636bd/chromeos-base/chromeos-initramfs/chromeos-initramfs-9999.ebuild
[modify] https://crrev.com/8596bac3b7c67577b61136ad935e83a7d01636bd/chromeos-base/ec-utils/ec-utils-9999.ebuild

This should be fixed now, I will watch the sarien buider.