K 10
svn:author
V 6
luporl
K 8
svn:date
V 27
2019-06-11T11:16:41.899814Z
K 7
svn:log
V 643
[PPC64] Fix ofw_initrd

Before this change, OFW initrd (as md) handling code was simulating an ofwbus
device. But as there isn't really a Device Tree (DT) node representing OFW
initrd (it is specified in 2 properties under /chosen), its driver was in fact
stealing other driver's DT node.  This was noticed after MD_ROOT_MEM became
default and QEMU's USB keyboard stopped working under VNC.

This change consists in simplifying the process of detection and mapping of
initrd memory, turning it into a simple startup step, instead of trying to
simulate a device.

Reviewed by:	jhibbits
Differential Revision:	https://reviews.freebsd.org/D20553

END