Got my hands on neo freerunner debug board (here's its photo), it has place for 20 pin jtag connector (I need to find one and solder it). Thanks to max_posedon who borrowed this board to me :) The only missing thing now is screw driver, as I have no screw driver for such small screws... I'm going to find and buy it tomorrow :)
Just bricked my rx1950 by flashing prepared kernel image instead of WinMo. Now need to disassemble my rx1950, find out where's jtag pins, make jtag cable and restore it :) Here 's sources of tool to prepare kernel image, however don't use it, it doesn't work yet.
Good news everyone :) Ben Dooks merged my patches for rx1950 support into his tree last night. It seems that we'll see basic rx1950 support in mainline 2.6.35 kernel. Neat :) Also ~1.5 weeks ago I finished battery driver for rx1950, it's accurate enough and it can be used for h1930/h1940; however it needs some cleanup. And now I'm preparing report for LVEE, so my kernel activity is frozen for some time :)