[PATCH 1/1] doc: describe MSEL settings for booting from SD card

[Heinrich Schuchardt]

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 at canonical.com>
---
 doc/board/sifive/unmatched.rst | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/doc/board/sifive/unmatched.rst b/doc/board/sifive/unmatched.rst
index b52a1f690c..24a889991c 100644
--- a/doc/board/sifive/unmatched.rst
+++ b/doc/board/sifive/unmatched.rst
@@ -20,8 +20,11 @@ The support for following drivers are already enabled:
 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
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-- 
2.33.1