Index: sys/dev/flash/mx25l.c
===================================================================
--- sys/dev/flash/mx25l.c
+++ sys/dev/flash/mx25l.c
@@ -152,6 +152,9 @@
 	/* GigaDevice */
 	{ "gd25q64",	0xc8, 0x4017, 64 * 1024, 128, FL_ERASE_4K },
 	{ "gd25q128",	0xc8, 0x4018, 64 * 1024, 256, FL_ERASE_4K },
+
+	/* Integrated Silicon Solution */
+	{ "is25wp256",	0x9d, 0x7019, 64 * 1024, 512, FL_ERASE_4K | FL_ENABLE_4B_ADDR},
 };
 
 static int
Index: sys/riscv/sifive/sifive_spi.c
===================================================================
--- sys/riscv/sifive/sifive_spi.c
+++ sys/riscv/sifive/sifive_spi.c
@@ -219,6 +219,9 @@
 	SFSPI_WRITE(sc, SFSPI_REG_SCKDIV, sckdiv);
 
 	switch (mode) {
+	case SPIBUS_MODE_NONE:
+		sckmode = 0;
+		break;
 	case SPIBUS_MODE_CPHA:
 		sckmode = SFSPI_SCKMODE_PHA;
 		break;
@@ -228,6 +231,8 @@
 	case SPIBUS_MODE_CPOL_CPHA:
 		sckmode = SFSPI_SCKMODE_PHA | SFSPI_SCKMODE_POL;
 		break;
+	default:
+		return (EINVAL);
 	}
 	SFSPI_WRITE(sc, SFSPI_REG_SCKMODE, sckmode);