As of build 65 (R53-8381.0.0):

https://uberchromegw.corp.google.com/i/chromeos/builders/veyron_jerry-release/builds/65/steps/BuildPackages%20%5Bafdo_use%5D/logs/stdio

chromeos-ec-0.0.1-r3046:   LD      RO/ec.RO.elf
chromeos-ec-0.0.1-r3046: /usr/x86_64-pc-linux-gnu/arm-none-eabi/binutils-bin/2.25.51/ld.bfd.real: No room left in the flash

Build 64 (R53-8380.0.0) passed:
Completed chromeos-base/chromeos-ec-0.0.1-r3043 (in 1m12.8s)

https://chromium.googlesource.com/chromiumos/platform/ec/+log/cebf8734d96d8c6a44185ee1b7d38b4d42efd36a..dc3de2c826fe96c6d45cd72a2135951da4237c74?n=10000

dc3de2c reef: Initialize charge suppliers after change manager is initialized by Vijay Hiremath · 3 days ago
52fdd95 BD99955: Get the VBUS provided status from individual ports by Vijay Hiremath · 3 days ago
0c57824 reef: Re-factor PP5000 and PP3300 enable/disable by David Hendricks · 3 days ago
3026836 apollolake: modify PMIC_EN and RSMRST_N handling by Kevin K Wong · 3 days ago
00c1a09 Timer initialization & conversion bug fixes by Nadim Taha · 3 days ago
d1beddc pwm: Modify new PWM host commands to take 16-bit duty cycle by Shawn Nematbakhsh · 3 days ago
8f886b4 lucid: Add battery temp to temp_sensors list by Mary Ruthven · 3 days ago
9139071 cr50: disable UART peripheral when the device is powered off. by Mary Ruthven · 3 days ago
f89b5a9 cr50: dont drive UART output if servo is connected by Mary Ruthven · 3 days ago
1d7984a cr50: monitor the state of Servo, the EC, and AP by Mary Ruthven · 3 days ago

However... when I checkout dc3de2c, cros_workon & emerge veryon_jerry chromeos-ec ... it passes!