On 2022-10-04, Grant Edwards <grant.b.edwards@xxxxxxxxx> wrote:
> I just ran into what I think is the same problem when upgrading from
> 5.10.76 to 5.15.68 (sorry I don't have any intermediate kernel
> versions to test with). This is an oxford quad 950 board that has
> worked flawlessly for many years. Now the baud rates are all wrong.
>
> [...]
After reading through the thread a third time, I tried enabling
CONFIG_SERIAL_8250_16550A_VARIANTS in my 6.15.69 kernel, and my quad
Oxford board works again.
The first two times I read through the thread I misunderstood the statement
Can you please confirm that you have the
CONFIG_SERIAL_8250_16550A_VARIANTS option disabled (default to
"off" for x86 only)?
as meaning that you should disable that option as a prerequisite to
making it work. So I checked to make sure it was disabled (it
was). Yes, it's obvious now what was meant was that having it disabled
explains the previous observations.
--
Grant
