[PATCH] Adding support for multiple boot-time passes of the device tree

John Baldwin jhb at FreeBSD.org
Tue May 19 19:11:05 UTC 2009

If you were at BSDCan a few weeks ago you may have seen my proposal for 
extending new-bus to support multiple scans of the device tree during 
boot-time probing.  This patch is the infrastructure work to allow multiple 
passes.  It does not move any drivers (except root0 which is already special) 
into an early pass, so all devices will still probe as a single pass for now.  
However, getting this in now before 8.0 will enable folks to start working on 
other problems such as resource discovery and management and will get the ABI 
set before the 8.0 feature freeze.  The paper where I go into greater detail 
about the rationale and implementation is available at 
http://www.FreeBSD.org/~jhb/papers/bsdcan/2009/.  The actual patch is 
available for review at http://www.FreeBSD.org/~jhb/patches/multipass.patch

John Baldwin

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