[PATCH 2/2] docs: move kwboot description to generic mvebu section

[Uwe Kleine-König]

Expand the generic part about kwboot to the mvebu page and advertise the
parameter -n to make it simpler to boot some machines.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 Documentation/boards/mvebu.rst                       |  5 ++++-
 Documentation/boards/mvebu/Netgear-ReadyNAS-2120.rst | 13 ++-----------
 2 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/Documentation/boards/mvebu.rst b/Documentation/boards/mvebu.rst
index 4dfdc4a8f761..18a5c150bb95 100644
--- a/Documentation/boards/mvebu.rst
+++ b/Documentation/boards/mvebu.rst
@@ -35,7 +35,10 @@ Booting from UART
 -----------------
 
 The mvebu SoCs support booting from UART. For this there is a tool available in
-barebox called kwboot.
+barebox called ``kwboot``. Quite some mvebu boards are reset once more when
+they already started to read the first block of the image to boot. If you want
+to boot such a board, use the parameter ``-n 15`` for ``kwboot``. (The number
+might have to be adapted per board.)
 
 mvebu boards
 ------------
diff --git a/Documentation/boards/mvebu/Netgear-ReadyNAS-2120.rst b/Documentation/boards/mvebu/Netgear-ReadyNAS-2120.rst
index 5bee03af9d38..488af2d7acfe 100644
--- a/Documentation/boards/mvebu/Netgear-ReadyNAS-2120.rst
+++ b/Documentation/boards/mvebu/Netgear-ReadyNAS-2120.rst
@@ -6,14 +6,5 @@ This is a rack mountable 4 bay NAS using an Armada XP dual-core processor.
 UART booting
 ------------
 
-The first UART hides behind a sticker on 4 pins.
-
-The machine seems to do two resets at power on which makes UART booting hard. A
-trick to work around this is::
-
-  scripts/kwboot -d /dev/ttyUSB0; kwboot -b images/barebox-netgear-rn2120.img -t /dev/ttyUSB0
-
-This way the first window in which the CPU accepts the magic string is taken by
-the first invokation which blocks until the second reset happens. The second
-window is then hit with the image to boot. This is not 100% reliable but works
-most of the time.
+The UART that can be used to boot via RS232 (using ``kwboot``) hides behind a
+sticker on the backside of the machine. It uses TTL levels.
-- 
2.11.0