Something appears to have broken hoho FW between last release,

hoho_v1.7.684-69498dd.bin

and tip of branch

git log --oneline 69498dd...cros/firmware-samus-6300.B

contains 177 patches so will likely need to bisect.

Test against a samus running,

RO version:    samus_v1.7.703-f30d79f
RW version:    samus_v1.7.703-f30d79f
Firmware copy: RW
Build info:    samus_v1.7.703-f30d79f 2015-12-30 12:01:34 @build120-m2

fwid                   = Google_Samus.6300.174.0        # Active firmware ID
ro_fwid                = Google_Samus.6300.174.0        # Read-only firmware ID

Linux localhost 3.14.0 #1 SMP PREEMPT Wed Feb 15 20:26:13 PST 2017 x86_64 Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz GenuineIntel GNU/Linux

cros_secure console= loglevel=7 init=/sbin/init cros_secure oops=panic panic=-1 root=/dev/dm-0 rootwait ro dm_verity.error_behavior=3 dm_verity.max_bios=-1 dm_verity.dev_wait=1 dm="1 vroot none ro 1,0 3584000 verity payload=PARTUUID=15069a5b-ec40-8246-a0ba-048932f8bd83/PARTNROFF=1 hashtree=PARTUUID=15069a5b-ec40-8246-a0ba-048932f8bd83/PARTNROFF=1 hashstart=3584000 alg=sha1 root_hexdigest=95dc512a79178b5808c1dc55645bd82eaa8e7709 salt=332632efe3c4f531d129b425f2f74f2e70251b8b1461baf120c94c7b019b1c60" noinitrd cros_debug vt.global_cursor_default=0 kern_guid=15069a5b-ec40-8246-a0ba-048932f8bd83 add_efi_memmap boot=local noresume noswap i915.modeset=1 tpm_tis.force=1 tpm_tis.interrupts=0 nmi_watchdog=panic,lapic i915.enable_psr=1 
CHROMEOS_RELEASE_DESCRIPTION=9288.0.0 (Official Build) dev-channel samus test


Was able to make a trivial edit atop SHA 69498dd and still see alternate mode succeed / external display driven.