diff --git a/drivers/serial/cpm_uart/cpm_uart_cpm2.c b/drivers/serial/cpm_uart/cpm_uart_cpm2.c
index b422c3abfba6..c4c8f4b44f53 100644
--- a/drivers/serial/cpm_uart/cpm_uart_cpm2.c
+++ b/drivers/serial/cpm_uart/cpm_uart_cpm2.c
@@ -134,12 +134,21 @@ void scc1_lineif(struct uart_cpm_port *pinfo)
 
 void scc2_lineif(struct uart_cpm_port *pinfo)
 {
+	/*
+	 * STx GP3 uses the SCC2 secondary option pin assignment
+	 * which this driver doesn't account for in the static
+	 * pin assignments. This kind of board specific info
+	 * really has to get out of the driver so boards can
+	 * be supported in a sane fashion.
+	 */
+#ifndef CONFIG_STX_GP3
 	volatile iop_cpm2_t *io = &cpm2_immr->im_ioport;
 	io->iop_pparb |= 0x008b0000;
 	io->iop_pdirb |= 0x00880000;
 	io->iop_psorb |= 0x00880000;
 	io->iop_pdirb &= ~0x00030000;
 	io->iop_psorb &= ~0x00030000;
+#endif
 	cpm2_immr->im_cpmux.cmx_scr &= 0xff00ffff;
 	cpm2_immr->im_cpmux.cmx_scr |= 0x00090000;
 	pinfo->brg = 2;