how to change small denisty of LPDDR4 at TX1 or TX2?

We want to use TX1 or TX2 to test our LPDDR4.
But our LPDDR4 is small denisty , 4Gb only.
How to change setup of TX1 or TX2 to run samll denisty LPDDR4?
Is it possible?

Thanks!

Mike