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Bug#1151843: Acknowledgement (linux-image-6.1.0-54-amd64: DCF77 Doesn't work after kernel update.)

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Hi there


A little update:
I still haven't been able to replicate this problem in any other way than 
hookup up the DCF77 receiver to the multi serial card.
However, using Minicom to send ASCII data (which just works) and then 
hooking up the DCF77 receiver, shows ASCII when there should only be 
binary data. As if old data from a buffer is being flushed.

I noticed a change in /usr/src/linux/drivers/tty/serial/8250/8250_port.c;

   /*
    * Recover from no-data-ready and FIFO error condition to avoid getting
    * stuck in the ISR.
    */
    if (!(status & UART_LSR_DR) && (status & UART_LSR_FIFOE))
      serial8250_clear_and_reinit_fifos(up);

Flushing the FIFO when this really should happen would probably result 
in the experienced behaviour. It is perfectly normal for a DCF77 receiver 
to produce a continuous stream of breaks, framing- and parity errors and 
the software should just ignore these.
I will try to build a kernel without this change. I haven't build a kernel 
since the 1990's, so this may take some time to figure out.
If this works I will try to modify the above change.


Regards,
Rob

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Bug#1151843: linux-image-6.1.0-54-amd64: DCF77 Doesn't work after kernel update. Rob van der Putten <rob@sput.nl> - 2026-10-23 22:30 +0200
  Bug#1151843: Acknowledgement (linux-image-6.1.0-54-amd64: DCF77 Doesn't work after kernel update.) Rob van der Putten <rob@sput.nl> - 2026-10-26 14:50 +0100

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