doc: describe MSEL settings for booting from SD card
unmatched.rst describes booting from SD card or from SPI. But only for
booting from SPI the boot selection settings are described.
Add the missing information.
Fix a typo 'uSD'.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/doc/board/sifive/unmatched.rst b/doc/board/sifive/unmatched.rst
index b52a1f6..24a8899 100644
--- a/doc/board/sifive/unmatched.rst
+++ b/doc/board/sifive/unmatched.rst
@@ -20,8 +20,11 @@
4. SiFive SPI Driver.
5. MMC SPI Driver for MMC/SD support.
-Booting from uSD using U-Boot SPL
----------------------------------
+Booting from micro SD card using U-Boot SPL
+-------------------------------------------
+
+Booting from an SD card requires that the boot mode selection DIP switches
+MSEL[3:0] are set to 1011.
Building
--------