Right - it is my typo : the multiplexed role of PRG0_PRU0_GPI8 is SD4_CLK. The undocumented role of PRG0_PRU0_GPIO18 or GPI18 remains. Update : boost pack document states that SD3, SD6, and SD7. Since GPI18 might be used as SD4_D, The single chip motor project might be using SD3_D, SD4_D and SD_5, rather than channels 3,6 and 7. I will wait for confirmation from BP board owner. I have not raised the question about the mysterious role of PRG0_PRU0_GPI8.
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