[problem] stop to run netbsd at "wd1(piixide1:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)"

[wang_jiabo <jiabwang%redhat.com@localhost>]

Hello, all :
   I install NetBSD 4.0 on my machine, my device have 2 hard disk, one 
is hda, another is sda
my hda installed the Windows vista, sda installed the RHEL5.2 and NetBSD4.0.
I used GRUB to startup my system.
   my GRUB file is:

default=0
timeout=5
splashimage=(hd1,4)/grub/splash.xpm.gz
hiddenmenu
title Red Hat Enterprise Linux Server (2.6.18-xx.el5)
       root (hd1,4)
       kernel /vmlinuz-2.6.18-xx.el5 ro root=LABEL=/1 rhgb quiet 
crashkernel=128M@16M
       initrd /initrd-2.6.18-xx.el5.img
title NetBSD 4.0
      rootnoverify (hd1,7)
      chainloader  +1
title Other
      rootnoverify (hd0,0)
      chainloader   +1

RHEL and windows are no problem, I can use the systems,
but when I startup the netbsd4.0, it is stopped at line 
"wd1(piixide1:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) 
(using DMA)"
at line "wd0(piixide1:0:0): using PIO mode 4, Ultra-DMA mode 6 
(Ultra/133) (using DMA) is no problem, passed.