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OPAL_SYNC_HOST_REBOOT
=====================
::
static int64_t opal_sync_host_reboot(void)
This OPAL call halts asynchronous operations in preparation for something
like kexec. It will halt DMA as well notification of some events (such
as a new error log being available for retreival).
It's meant to be called in a loop until OPAL_SUCCESS is returned.
Returns
-------
OPAL_SUCCESS
Success!
OPAL_BUSY_EVENT
not yet complete, call opal_sync_host_reboot() again, possibly with a short delay.
OPAL_BUSY
Call opal_poll_events() and then retry opal_sync_host_reboot
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