board: Add Toby-Churchill SL50 board support.

Add support for Lightwriter SL50 series board, a small, robust and portable
Voice Output Communication Aids (VOCA) designed to meet the particular and
changing needs of people with speech loss resulting from a wide range of
acquired, progressive and congenital conditions.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
diff --git a/configs/am335x_sl50_defconfig b/configs/am335x_sl50_defconfig
new file mode 100644
index 0000000..0ddccc8
--- /dev/null
+++ b/configs/am335x_sl50_defconfig
@@ -0,0 +1,10 @@
+CONFIG_ARM=y
+CONFIG_TARGET_AM335X_SL50=y
+CONFIG_SPL=y
+CONFIG_SPL_STACK_R=y
+CONFIG_SPL_STACK_R_ADDR=0x82000000
+CONFIG_SYS_EXTRA_OPTIONS="EMMC_BOOT"
+CONFIG_CONS_INDEX=1
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_SETEXPR is not set