Has anything changed that would allow the kernel to be read directly
from RAID 1 components on other architectures besides alpha and pmax?

From RAIDCTL(8)
---
Note that kernels can only be directly read from 
RAID 1 components on alpha and pmax architectures.
On those architectures, the FS_RAID file system 
is recognized by the bootblocks, and will properly 
load the kernel directly from a RAID 1 component.
For other architectures, or to support the root 
file system on other RAID sets, some other mechanism 
must be used to get a kernel booting.  For example, 
a small partition containing...
---

Thomas

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