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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2017-06-02 20:22:04 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2017-06-06 09:17:00 +0200 |
| commit | ebaa911f2da5206a2f750fd3708de14f35398692 (patch) | |
| tree | d50e6017639015e851c3bdc0057f189d29690dba | |
| parent | ba97a1c1365195e5a76c71355fc5e471d92382b7 (diff) | |
| download | barebox-ebaa911f2da5206a2f750fd3708de14f35398692.tar.gz barebox-ebaa911f2da5206a2f750fd3708de14f35398692.tar.xz | |
docs: move kwboot description to generic mvebu section
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@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
| -rw-r--r-- | Documentation/boards/mvebu.rst | 5 | ||||
| -rw-r--r-- | 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 42dcdb8c85..8e5612283e 100644 --- a/Documentation/boards/mvebu.rst +++ b/Documentation/boards/mvebu.rst @@ -36,7 +36,10 @@ 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 5bee03af9d..488af2d7ac 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. |