diff --git a/board/compulab/trimslice/trimslice.c b/board/compulab/trimslice/trimslice.c
index f15fbd7..1ac15f8 100644
--- a/board/compulab/trimslice/trimslice.c
+++ b/board/compulab/trimslice/trimslice.c
@@ -42,6 +42,11 @@
 {
 }
 
+void pin_mux_spi(void)
+{
+	funcmux_select(PERIPH_ID_SPI1, FUNCMUX_SPI1_GMC_GMD);
+}
+
 /*
  * Routine: pin_mux_mmc
  * Description: setup the pin muxes/tristate values for the SDMMC(s)