How can I access the U-Boot command line in my DE0-Nano-SoC board?

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How can I access the U-Boot command line in my DE0-Nano-SoC board?

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I have DE0-Nano-SoC running pre-compiled Linux (I'm new to the whole Linux compiling and booting - it's really overwhelming :()

I want to assign a certain size of the RAM for the Linux Kernel. I read that to do this, I must either type some commands in the U-boot command line or using the U-boot script.

My question is how can I access the U-Boot command line in my DE0-Nano-SoC board.

Thank you very much in advance.

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