[PATCH v3 03/29] doc: ls1046ardb: Expand boot mode section

[Sean Anderson]

This adds some additional info about booting from different sources,
including the correct switch positions.

Signed-off-by: Sean Anderson <sean.anderson at seco.com>
---

(no changes since v1)

 doc/board/nxp/ls1046ardb.rst | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/doc/board/nxp/ls1046ardb.rst b/doc/board/nxp/ls1046ardb.rst
index 4bfeaa93dd..c73516c070 100644
--- a/doc/board/nxp/ls1046ardb.rst
+++ b/doc/board/nxp/ls1046ardb.rst
@@ -95,6 +95,17 @@ Start Address      End Address        Description        Size
 
 Booting Options
 ---------------
-- QSPI boot
-- SD boot
-- eMMC boot
+
+NB: The reference manual documents the RCW source with the *least-significant
+bit first*.
+
+QSPI boot
+^^^^^^^^^
+
+This is the default. ``{ SW5[0:8], SW4[0] }`` should be ``0010_0010_0``.
+
+SD boot and eMMC boot
+^^^^^^^^^^^^^^^^^^^^^
+
+``{ SW5[0:8], SW4[0] }`` should be ``0010_0000_0``. eMMC is selected only if
+there is no SD card in the slot.
-- 
2.25.1