tree 341a170c91d618bc44e4c3a8d36297ff27888569
parent a5311abddaa057a50b492c839b310f968a7e270f
author Andrew Geissler <geissonator@yahoo.com> 1580490155 -0600
committer Andrew Geissler <geissonator@yahoo.com> 1582142706 -0600

warm-reboot: ensure sbe start bit is 0

Cold reboots assume the SBE start bit (P9_CBS_REG, bit 0) will start out
with a value of 0. When the chassis power is cycled, this is a valid
assumption. However, when doing a warm reboot (chassis power remains on)
this is not a valid assumption.

The SBE depends on seeing the 0->1 transition of this bit to know when
to start the host. To support warm reboots, ensure the bit starts at 0.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: Iba80ee030ab6f7e7468e4a86cc00668f20f2348e