On 5/5/26 18:59, altoid via Dng wrote:
> Hello:
>
> On 6 May 2026 at 11:08, terryc wrote:
>
>> My 2c guess is does /dev/ttyS4 exist?
> Just a guess and it may *not* apply.
> But it could point in the right direction:
>
> [quote]
> Detect More Than Four Serial Ports in Linux Desktop
> Updated May 1, 2025
> [/quote]
>
> [url]https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000001Dn
> ZLCA0&l=ko-KR[/url]
>
> TL;DR
>
> The CONFIG_SERIAL_8250_NR_UARTS parameter in the configuration kernel
> file defines the maximum number of serial ports handled by the
> kernel.
>
> To detect more than four serial ports, do the following:
>
> Edit /etc/default/grub and add 8250.nr_uarts=<number of ports> to the
> line starting GRUB_CMDLINE_LINUX= ...
>
> Best,
>
> A.
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Hi,
That fixed it! Thanks for the help.

Best regards,
Fred
(subscribed)