On Fri, Jan 14, 2022 at 10:41:52PM +0100, Jan Stary wrote: > I suspect it's com1; I have yet to try commenting out just tty01. > But commenting out both makes it boot OK. > > com0 at acpi0 COMA addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo > com1 at acpi0 COMB addr 0x2f8/0x8 irq 3: ti16750, 64 byte fifo > > Are these known to misbehave under ttyflags? > > I realize a lot has changed since then, but it's a production machine, > and while I would love nothing more than go through the releases one > by one, this machine has to run now.
Well there were recently changes to make com attach via acpi, and now you have a com port that you didn't have before. My suspicion would be that the new com1 either does not really exist in hardware, or that it's mis-configured. Does the BIOS mention it? Can it be disabled there?
