topic imx6 debug uart change in i.MX Processors

imx6 debug uart change

kangmw086 — Tue, 30 Oct 2018 15:57:19 GMT

I use the Sabreauto board.

I'm trying to change the yocto debug port.

Sabre board confirmed it was uart4.

I'd like to change it to uart3.

I saw an article written by victor Wang .....https://community.nxp.com/thread/319950 <-- good

question!!

Why do I need this part to change the debug port?

<yocto>/source/meta-fsl-arm/conf/machine/include/imx6sabresd-common.inc

SERIAL_CONSOLE = "115200 ttymxc2"

Does it not work if I change it only on uboot and kernel?

best regards.

Re: imx6 debug uart change

jimmychan — Fri, 02 Nov 2018 09:57:37 GMT

You can find the definition of SERIAL_CONSOLE in Yocto Project Reference Manual . And according to the reference manual, the SERIAL_CONSOLE variable is deprecated.

Re: imx6 debug uart change

turker — Sun, 18 Nov 2018 10:25:52 GMT

I think it is required for proper setup of getty on serial ports if you are using sysvinit. Here is a portion of sysvinit-inittab recipe from openembedded layer:

tmp="${SERIAL_CONSOLES}"
for i in $tmp
do
    j=`echo ${i} | sed s/\;/\ /g`
    label=`echo ${i} | sed -e 's/tty//' -e 's/^.*;//' -e 's/;.*//'`
    echo "$label:12345:respawn:${base_sbindir}/getty -L ${j}" >> ${D}${sysconfdir}/inittab
done