On 2022-09-14 16:15, Maciej W. Rozycki wrote:
On Wed, 14 Sep 2022, Maciej W. Rozycki wrote:
I'll examine your I/O conversation log in detail and will see if I can
come up with a possible explanation.
I think I know what is going on here. Can you please confirm that you
have the CONFIG_SERIAL_8250_16550A_VARIANTS option disabled (default to
"off" for x86 only)? That would explain things.
Just found that myself while going through the initializaton sequence (while now knowing what to look for)
Thats what you get for choosing Fedora ;-)
Offhand I am not sure what to do here. There are several options to
choose from I can think of right now:
1. Disable new OxSemi Tornado clock code iff !SERIAL_8250_16550A_VARIANTS,
bringing back buggy calculation for rates above 115200bps and coarse
BOTHER granularity.
2. Same as above, but additionally limit the baud rates to 115200bps to
avoid buggy rates.
3. Force SERIAL_8250_16550A_VARIANTS to "y" if SERIAL_8250_PCI != "n".
4. Remove SERIAL_8250_16550A_VARIANTS altogether and execute code it
guards unconditionally (does it still matter nowadays?).
5. Something else not yet determined.
Greg, do you have any opinion?
Maciej
--
Anders Blomdell Email: anders.blomdell@xxxxxxxxxxxxxx
Department of Automatic Control
Lund University Phone: +46 46 222 4625
P.O. Box 118
SE-221 00 Lund, Sweden
