Hello,
I've tried to use J-Link to flash BeagleBoard rev.B4 with cpu OMAP3530 (Cortex a8 core).
On PC I have Ubuntu 11.10 so I installed drivers for jlink on linux (use V4.41g).
But after installing, connecting to board and runnig JLinkExe i take this:

------------------------------------------------------------------------------
SEGGER J-Link Commander V4.41g ('?' for help)
Compiled Jan 27 2012 19:11:22

****** Error: Could not save file [Default.ini]
Invalid file handle!

DLL version V4.41g, compiled Jan 27 2012 19:11:21
Firmware: J-Link ARM V8 compiled Jan 12 2012 20:43:19
Hardware: V8.00
S/N: 58001333
Feature(s): RDI, FlashBP, FlashDL, JFlash, GDB
VTarget = 0.957V

****** Error: Supply voltage too low (1 Volt is required, Measured: 0.9 Volt).
Please check target power.
No devices found on JTAG chain. Trying to find device on SWD.

WARNING: RESET (pin 15) high, but should be low. Please check target hardware.

****** Error: Supply voltage too low (1 Volt is required, Measured: 0.9 Volt).
Please check target power.
No device found on SWD.
Did not find any core.

****** Error: Supply voltage too low (1 Volt is required, Measured: 0.9 Volt).
Please check target power.
No devices found on JTAG chain. Trying to find device on SWD.

WARNING: RESET (pin 15) high, but should be low. Please check target hardware.
No device found on SWD.
Did not find any core.
--------------------------------------------------------------------------------------

So as I see there problem with with supply voltage on pin 1.

But I used this Jlink with board LPC2138 while working on PC with Windows and it works great. So I think its not a problem with JLink.
I havent opportunity to try use beagleboard on windows, so I need solve this problem on ubuntu.

Can it be related with drivers for jlink? Or its problem in target board?

Finally I think I found out what problem occured.

Jlink uses standard ARM 20-pin JTAG interface, Beagleboard 14-pin JTAG, so I use 14/20 pin JTAG converter to connect it.
But beagleboard uses not classic ARM jtag. Board comes with a 14 pin TI JTAG connector, so they have different pinout.

Fortunately, it isn't fried my board and it's still working.