[UART] GPS 18-5Hz LVC and COM1 silence, OK on Linux though...

Igor Mozolevsky igor at hybrid-lab.co.uk
Sun Apr 28 23:18:01 UTC 2013

On 28 April 2013 19:04, Kevin Oberman <rkoberman at gmail.com> wrote:

> Even though you have only a single physical port, most systems have at least
> a dual serial UART controller, though only one mat have a DB-9 connector
> attached. Can you look at /var/run/dmesg.boot and confirm that only one UART
> is is found? E.g.:
> uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
> uart1: <16550 or compatible> port 0x2f8-0x2ff irq 3 on acpi0
> (Note that this system has only a single DB-9 connector for uart0. I suspect
> that there is a header for uart1 on the board, but I've never had a need to
> check.

It is the only one---I've disabled COM2 in BIOS, and according to the
manual the external connector is COM1 (mobo is JNF99FL-525). Just
tried re-enabling COM2 in BIOS, but that made no difference---both
cuau0 and cuau1 remain silent... I'm beginning to think that it might
be an `unintended feature' that crept into the UART code...


Igor M.

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