[yocto] Changing the tty/UART of busybox

[Jakob Hasse]

Hi Maxin,

thanks, this worked!

All the Best,
Jakob

On 28.02.2018 14:13, Maxin B. John wrote:
> Hi Jakob,
>
>> On Wed, Feb 28, 2018 at 11:15:42AM +0100, Jakob Hasse wrote:
>>
>> Hello,
>>
>> we need to change the tty on which busybox is sitting. Right now I could change
>> the UART for the kernel and all program output after the boot to our favorite
>> UART (via kernel cmd line). But the login promt and all interaction with the
>> device is still on the old UART. So I guess it's a busybox configuration issue.
>> Furthermore, when I try tty after login, it gives me: /dev/ttymxc4 (we want to use ttymx1).
>>
>> I looked here https://busybox.net/downloads/BusyBox.html and in menuconfig
>> for an option to change the UART interface but couldn't find any. Furthermore I added
>>
>> ::respawn:/sbin/getty -L ttymxc1 115200 vt100
>>
>> and this
>>
>> ttymxc1::respawn:/sbin/getty -L ttymxc1 115200 vt100
>>
>> to inittab to change the UART with no luck.
>> Could someone here point me to documentation or give me a hint to achive this?
> Generally, the console setting comes from our <machine>.conf. eg:
> for beaglebone:
> ./meta-yocto-bsp/conf/machine/beaglebone-yocto.conf:
> SERIAL_CONSOLE = "115200 ttyO0"
>
> This gets processed in bitbake.conf:
> SERIAL_CONSOLES ??= "${@d.getVar('SERIAL_CONSOLE').replace(' ', ';')}"
>
> later, based on the init manager:
> busybox, systemd-serialgetty, or sysvinit-inittab use it.
>
> In this case, updating the "<machine>.conf" should help.
>
>> Thanks in advance, all the Best,
>> Jakob
>>
>> -- 
>> Jakob Hasse
>> Software Developement
>>
>> E: jakob.hasse at smart-home-technology.ch
>> T: +41 44 552 02 66
>>
>> Smart Home Technology GmbH
>> www.smart-home-technology.ch
> Best Regards,
> Maxin

-- 
Jakob Hasse
Software Developement

E: jakob.hasse at smart-home-technology.ch
T: +41 44 552 02 66

Smart Home Technology GmbH
www.smart-home-technology.ch