OBS266とLinkStation(HD-HGLAN)の比較 (4) /proc/interrupts

OBS266 w/ Debian(sid)

$ more /proc/interrupts
CPU0
0:       6759  IBM UIC Level     serial
2:      11826  IBM UIC Level     IBM OCP IIC
9:          0  IBM UIC Level     OCP EMAC Wakeup
10:          0  IBM UIC Level     OCP EMAC MAL SERR
11:    1079810  IBM UIC Level     OCP EMAC TX EOB
12:     759899  IBM UIC Level     OCP EMAC RX EOB
13:          0  IBM UIC Level     OCP EMAC TX DE
14:          0  IBM UIC Level     OCP EMAC RX DE
15:          0  IBM UIC Level     OCP EMAC MAC
26:          0  IBM UIC Edge      push switch
30:    2637780  IBM UIC Level     ide0
BAD:          0

LinkStation(Original+telnet)

$ more /proc/interrupts
CPU0
16:      12123   OpenPIC   Level     eth0
17:        967   OpenPIC   Level     ide0
19:          0   OpenPIC   Level     ehci-hcd, usb-ohci, usb-ohci
137:        176   OpenPIC   Level     serial
138:        128   OpenPIC   Level     serial
BAD:          1

LinkStatonのBAD 1ってなんだ？