ddb/db_active.h: New home for extern db_active.

This can be included unconditionally, and db_active can then be
queried unconditionally; if DDB is not in the kernel, then db_active
is a constant zer

ddb/db_active.h: New home for extern db_active.

This can be included unconditionally, and db_active can then be
queried unconditionally; if DDB is not in the kernel, then db_active
is a constant zero. Reduces need for #include opt_ddb.h, #ifdef DDB.

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UART_RFIFO_REG should be masked before passing to cn_check_magic(). there is any data in other than the lower 8 bits.

Rename of_match_compat_data() to of_compatible_match(). Similarly,
rename of_search_compatible() to of_compatible_lookup().

Standardize on of_compatible_match() for driver matching, and adapt
all c

Rename of_match_compat_data() to of_compatible_match(). Similarly,
rename of_search_compatible() to of_compatible_lookup().

Standardize on of_compatible_match() for driver matching, and adapt
all call sites.

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use fdtbus_intr_establish_xname

- since ttyinput (t_linesw->l_rint) should not be called from interrupt context,
it has been modified to use softint like other serial drivers.
- add spinlock for interrupt.

ok jmcneill@. thanks

Only enable RX interrupts if the device is open. Previously interrupts were
enabled unconditionally, which caused the interrupt handler to consume
input before WSDISPLAY_MULTICONS had a change to pol

Only enable RX interrupts if the device is open. Previously interrupts were
enabled unconditionally, which caused the interrupt handler to consume
input before WSDISPLAY_MULTICONS had a change to poll for data.

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Add support for (FDT-ized) Amlogic Meson8b.