diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2017-06-30 11:51:45 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2017-06-30 13:33:27 +0200 |
| commit | e2de305f11864a92cd1ce6ce6a7a42f098f754b6 (patch) | |
| tree | 950a3d614ff4fe27f56ed6a305feb4d158c8b622 /Documentation | |
| parent | d6fce00c3b5c6a039c1d8515c20f62cead19a762 (diff) | |
| download | barebox-e2de305f11864a92cd1ce6ce6a7a42f098f754b6.tar.gz barebox-e2de305f11864a92cd1ce6ce6a7a42f098f754b6.tar.xz | |
docs: mvebu: describe -n more accurately in the sphinx document
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/boards/mvebu.rst | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/Documentation/boards/mvebu.rst b/Documentation/boards/mvebu.rst index 8e5612283e..b28fd443b6 100644 --- a/Documentation/boards/mvebu.rst +++ b/Documentation/boards/mvebu.rst @@ -37,9 +37,15 @@ Booting from UART The mvebu SoCs support booting from UART. For this there is a tool available in 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.) +they already started to read the first block of the image to boot which +obviously results in a failure to boot this image. If you want to boot such a +board, use the parameter ``-n 15`` for ``kwboot`` to delay uploading the image +and try to hit the right (i.e. second) window harder. +(The number might have to be adapted per board. The semantic is that the magic +string is sent until the 15th NAK is seen and only then the image is sent.) A +typical commandline is: + + kwboot -b barebox.img -n 15 -B 115200 -t /dev/ttyUSB mvebu boards ------------ |