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The UART on am335x has two drivers: omap_uart and a variant of the 8250
driver omap8250. In commit ca8be8fc2c30 ("ARM: dts: am33xx-l4: fix UART
compatible") that is included in v6.18-rc1 the am335x device tree was
changed that only the omap8250 driver can be used going forward. Up to
now only the omap_uart was enabled. So to have a driver for that device,
enable the omap8250.
One issue while switching is that the two drivers use different base
names for the serial devices (ttyO* for omap_uart and ttyS* for
omap8250). To soften the transition also enable
SERIAL_8250_OMAP_TTYO_FIXUP which automatically falls back to ttySx if
console=ttyOx was given on the command line.
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