Re: IMX93 UART remapping

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On Thu, Mar 27, 2025 at 05:23 PM, <[email protected]> wrote:

>=20
> I working on a custom IMX93 based board and having trouble working out
> exactly what is necessary to remap the UART from the default UART1 to
> UART3 (or UART5). I've made a custom device tree with the nodes for the
> UART set to "status =3D okay". But I'm not sure it works, as the UART5 se=
ems
> to be muxed as an LCD controller (which we don't have and don't need). I
> deleted that node, but I'm not certain the pins are in the correct state.
> Also, how does one set the u-boot console to another UART? I've tried
> setting the console environment variable: "setenv console ttpLP4" (UARTS
> start numbering at 1, but the devices start at zero).

Hello,
is quite difficult to figure out the needed modifications without the schem=
atic, however you are on the right track with the console environment varia=
ble.
However you have to set the right UART in the system. Sometimes it's only a=
 matter of setting or changing the alias property in the DTS.
In case you could share more details.

Greetz,
--
Marco Cavallini | KOAN sas
Bergamo - Italia
embedded software engineering
=E2=9C=86:+39 351-9518710
https://KoanSoftware.com

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<div>On Thu, Mar 27, 2025 at 05:23 PM, &lt;[email protected]&gt;=
 wrote:</div>
<div>
<blockquote>I working on a custom IMX93 based board and having trouble work=
ing out exactly what is necessary to remap the UART from the default UART1 =
to UART3 (or UART5). I've made a custom device tree with the nodes for the =
UART set to "status =3D okay". But I'm not sure it works, as the UART5 seem=
s to be muxed as an LCD controller (which we don't have and don't need). I =
deleted that node, but I'm not certain the pins are in the correct state. A=
lso, how does one set the u-boot console to another UART? I've tried settin=
g the console environment variable: "setenv console ttpLP4" (UARTS start nu=
mbering at 1, but the devices start at zero).</blockquote>
</div>
<div>
<div>Hello,</div>
<div>is quite difficult to figure out the needed modifications without the =
schematic, however you are on the right track with the <code>console</code>=
 environment variable.<br />However you have to set the right UART in the s=
ystem. Sometimes it's only a matter of setting or changing the <code>alias<=
/code> property in the DTS.</div>
<div>In case you could share more details.</div>
<div>&nbsp;</div>
<div>Greetz,</div>
<div>--<br />Marco Cavallini | KOAN sas<br />Bergamo - Italia&nbsp;<br />em=
bedded software engineering&nbsp;<br />=E2=9C=86:+39 351-9518710&nbsp;<br /=
>https://KoanSoftware.com</div>
</div>

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