RAID does not start automatically

[Clement]

I have setup several RAID based systems already, include a few with 
exactly the same software combination.  But this one just does not start 
the RAID automatically.   The partition type is  fd for Linux raid 
autodetect.   When booted, these are reported:

md: raid1 personality registered as nr 3
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
...
md: Autodetecting RAID arrays.
md: autorun ...                 
md: ... autorun DONE.

The RAID arrays are created with mdadm command.  They can be started 
alright by running mdrun.  However, this is not good enough to allow the 
RAIDed root partition be mounted.

The hardware is:
- Intel P4-2.8GHz on ICH5r m/b
- SATA 200MB as /dev/sda to form an incomplete mirror.
(*the other drive for the mirror purpose will be added later)
The software is:
- Debian Sarge
- Kernel 2.6.7, custom compiled with raid built-in
Your help is much appreciated.
Regards,
Clement
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