[U-Boot] u-boot serial uart command?

[U-Boot] u-boot serial uart command?

[Dell Green]

Hi Guys,

Brand new to this mailing list.

I have a Dart-MX6 imx6 Module that has a number of uarts. I have one of
the uarts connected to an external micro controller that excepts
commands via a basic binary messaging protocol. In linux I can
communicate with it using standard linux /dev/ttymxcN device.

In an effort to learn more about u-boot and how it works, I was
wondering if it was possible in u-boot shell to communicate with the
same uart device using the same messaging protocol. I see from the
source code there is code for serial.c and serial_mxc.c, but I'm not an
experienced u-boot developer to know if this is possible and how one
would approach it.

any help/pointers would be greatly appreciated.

[U-Boot] u-boot serial uart command?

[Lukasz Majewski]

Hi Dell,

> Hi Guys,
> 
> Brand new to this mailing list.
> 
> I have a Dart-MX6 imx6 Module that has a number of uarts. I have one
> of the uarts connected to an external micro controller that excepts
> commands via a basic binary messaging protocol. In linux I can
> communicate with it using standard linux /dev/ttymxcN device.
> 
> In an effort to learn more about u-boot and how it works, I was
> wondering if it was possible in u-boot shell to communicate with the
> same uart device using the same messaging protocol. 

Have I understood you correctly that you would like to send data to
this device via u-boot shell (like echo "FOO" > /dev/ttySX) ?

As fair as I can tell there are some commands which allow you to
load/send data via uart (like i.e. loadb).

However, I also assume that you would like to keep the "console" and
have the possibility to send data from it to other uart?

To do this you probably would need to:

1. Add new command - e.g. serialfoomagic

2. Setup this extra serial port (in DT for your board) for your iMX
device.

3. Use this command to send data/commands  -> e.g. serialfoomagic cmd1

> I see from the
> source code there is code for serial.c and serial_mxc.c, but I'm not
> an experienced u-boot developer to know if this is possible and how
> one would approach it.
> 
> any help/pointers would be greatly appreciated.
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> https://lists.denx.de/listinfo/u-boot




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 488 bytes
Desc: OpenPGP digital signature
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20180709/882d238f/attachment.sig>

[U-Boot] u-boot serial uart command?

[Dell Green]

A non-text attachment was scrubbed...
Name: Building-for-future_44614cc1-fabf-4d2c-8370-04e21e4920e2.png
Type: image/png
Size: 38195 bytes
Desc: Building-for-future_44614cc1-fabf-4d2c-8370-04e21e4920e2.png
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20180706/7548a9e4/attachment.png>