Is there a way to get around the limit of 1048576 samples in IIO Oscilloscope in the daq2 design? I would like to DMA over all 1GB of the zc706 PL DDR3 adc fifo
A better approach might be to use iio_readdev command line application which does not have sample number limit and will allow you to store the raw captured data to disk.
Unfortunately there are still some additional software limits that prevent you from using the full 1GB. You can find some information on how to increase the limits here: How to increase waveform buffer on ADRV9371/ZC706. But it still won't give you the full 1GB, probably more ~300MB.
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