loading zimage into DE0-Nano's SDRAM

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loading zimage into DE0-Nano's SDRAM

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Iam trying load zimage into DE0-nano's SDRAM, but when i tried in jtagconfig command in terminal , its showing error like this , any help?

alex@alex:~$ jtagconfig

1) usb-blaster variant [7-1]

unable to lock chain (insufficient port permissions)

thanks,

alex.

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