Allow the pluart(4) baud rate to be changed.

It's most likely that users have the wrong baud rate in /etc/ttys as
this was corrected in revision 1.11 of sys/dev/ic/pluart.c. Make sure to
change the

Allow the pluart(4) baud rate to be changed.

It's most likely that users have the wrong baud rate in /etc/ttys as
this was corrected in revision 1.11 of sys/dev/ic/pluart.c. Make sure to
change the console baud rate from 38400 to 115200 in /etc/ttys before
upgrading.

ok visa@

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Bring back PL011 UART FIFO support to pluart(4). This time with working
tx interrupts.

Special treatment of Server Base System Architecture (SBSA) generic UART
devices is required as presence of the

Bring back PL011 UART FIFO support to pluart(4). This time with working
tx interrupts.

Special treatment of Server Base System Architecture (SBSA) generic UART
devices is required as presence of the interrupt trigger level register
is not guaranteed. Therefore treat such devices of having a 1-byte FIFO.

ok visa@

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Revert previous commit. It breaks the serial console on my rpi4.

Enable PL011 UART FIF0 support in pluart(4). The FIFO depth depends on
the revision and ranges from 16 to 32 bytes.

Special treatment of Server Base System Architecture (SBSA) generic UART
devices i

Enable PL011 UART FIF0 support in pluart(4). The FIFO depth depends on
the revision and ranges from 16 to 32 bytes.

Special treatment of Server Base System Architecture (SBSA) generic UART
devices is required as presence of the interrupt trigger level register
is not guaranteed. Therefore treat such devices of having a 1-byte FIFO.

With help from kettenis@ and ok visa@

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Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

Configure pins.

ok patrick@

Give the FDT interrupt API a more generic naming by replacing the
arm_intr_* prefix with fdt_intr_*.

ok kettenis@

Allow pluart(4) to attach to acpi(4).

ok mlarkin@, patrick@