Add support for Micronucleus bootloader

src/avrdude.1

@@ -233,6 +233,15 @@ In a nutshell, this programmer consists of simple USB->UART adapter, diode
 and couple of resistors. It uses serial connection to provide UPDI interface.
 See the texinfo documentation for more details and known issues.
 .Pp
+The Micronucleus bootloader is supported for both protocol version V1
+and V2. As the bootloader does not support reading from flash memory,
+use the
+.Fl V
+option to prevent AVRDUDE from verifing the flash memory.
+See the section on
+.Em extended parameters
+for Micronucleus specific options.
+.Pp
 Input files can be provided, and output files can be written in
 different file formats, such as raw binary files containing the data
 to download to the chip, Intel hex format, or Motorola S-record
@@ -1084,6 +1093,16 @@ Especially in ascii mode this happens very often, so setting a smaller value
 can speed up programming a lot. 
 The default value is 100ms. Using 10ms might work in most cases. 
 .El
+.It Ar Micronucleus bootloader
+.Bl -tag -offset indent -width indent
+.It Ar wait[=<timeout>]
+If the device is not connected, wait for the device to be plugged in.
+The optional
+.Ar timeout
+specifies the connection time-out in seconds.
+If no time-out is specified, AVRDUDE will wait indefinitely until the
+device is plugged in.
+.El
 .It Ar Wiring
 When using the Wiring programmer type, the
 following optional extended parameter is accepted: