if gdb server (openocd) answers qfThreadInfo with an empty string during boot,
gdb will not request thread info anymore. to keep thread awareness in gdb,
we have to answer with a non empty string, 'l' indicates an end of list,
and is a valid answer here.
Change-Id: I7870a5db1090c786f306db16a25871e69b8a9760
Signed-off-by: Zied Guermazi <guermazi.zied@gmail.com>
Reviewed-on: http://openocd.zylin.com/1432
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
a6863e9a52