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Hmm that is strange because that 19104600 node is the Nios II JTAG debug module. That information means:
1) USB-Blaster [USB-0] <--# 1 is your cable number, you can also identify the cable using "USB-0"
024090DD EP4SGX230 <-- this is the device that was found hanging off the programing cable
Node 0C006E00 JTAG UART# 1 <-- JTAG UART with an instance ID of 0
Node 19104600 Nios II# 0 <-- Nios II JTAG debug module with an instance ID of 0
Cable 1 and Nios II JTAG debug module instance ID 0 should be the defaults when you call nios2-flash-programmer from the command line. Perhaps you can try passing in the cable number and instance IDs into nios2-flash-programmer to see if it behaves differently. If I remember correctly the flags should be -c 1 -i 0
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Thanks !!
But now i'm getting error while creating .flash files using sof2flash command..the command i used is
sof2flash --input= filename.sof --outpu=filename_hw.flash --offset=0x00020000 --pfl --optionbit=0x18000 --programmingmode=FPP
and the error i'm getting is
jun 6, 2013 5:33:33 pm - (severe) sof2flash: error creating intermediate files,
exiting
please help me out friendss 
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