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Tools that manage md devices can be found at
   http://www.<country>.kernel.org/pub/linux/daemons/raid/....



You can boot (if you selected boot support in the configuration) with your md 
device with the following kernel command lines:

for old raid arrays without persistent superblocks:
  md=<md device no.>,<raid level>,<chunk size factor>,<fault level>,dev0,dev1,...,devn

for raid arrays with persistant superblocks
  md=<md device no.>,dev0,dev1,...,devn
  
md device no. = the number of the md device ... 
              0 means md0, 
              1 md1,
              2 md2,
              3 md3,
              4 md4

raid level = -1 linear mode
              0 striped mode
              other modes are only supported with persistant super blocks

chunk size factor = (raid-0 and raid-1 only)
              Set  the chunk size as 4k << n.
              
fault level = totally ignored
                            
dev0-devn: e.g. /dev/hda1,/dev/hdc1,/dev/sda1,/dev/sdb1
                            
A possible loadlin line (Harald Hoyer <HarryH@Royal.Net>)  looks like this:

e:\loadlin\loadlin e:\zimage root=/dev/md0 md=0,0,4,0,/dev/hdb2,/dev/hdc3 ro