NSLU2 JTAG issues

$ openocd -f interface/ftdi/olimex-arm-usb-ocd.cfg -f board/linksys_nslu2.cfg
Open On-Chip Debugger 0.8.0 (2015-04-14-09:12)
Licensed under GNU GPL v2
For bug reports, read
    http://openocd.sourceforge.net/doc/doxygen/bugs.html

Info : only one transport option; autoselect 'jtag'
adapter speed: 300 kHz
Info : ixp42x.cpu: hardware has 2 breakpoints and 2 watchpoints
0
Info : clock speed 300 kHz
Info : JTAG tap: ixp42x.cpu tap/device found: 0x29277013 (mfg: 0x009,
part: 0x9277, ver: 0x2)
[..]

$ telnet localhost 4444
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Open On-Chip Debugger
> halt
target was in unknown state when halt was requested
in procedure 'halt'
> poll
background polling: on
TAP: ixp42x.cpu (enabled)
target state: unknown