Comtrol eCos - Manual (Page 335)

Chapter 11. Porting Guide
legal_values 0 to CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS-1
default_value 0
description "
The EDK/7708 board has only one serial port. This option
chooses which port will be used to connect to a host
running GDB."
}
cdl_option CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL {
display "Diagnostic serial port"
flavor data
legal_values 0 to CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS-1
default_value 0
description "
The EDK/7708 board has only one serial port. This option
chooses which port will be used for diagnostic output."
}
The platform usually also specify an option controlling the ability to co-exist with a ROM monitor:
cdl_option CYGSEM_HAL_USE_ROM_MONITOR {
display "Work with a ROM monitor"
flavor booldata
legal_values { "Generic" "CygMon" "GDB_stubs" }
default_value { CYG_HAL_STARTUP == "RAM" ? "CygMon" : 0 }
parent CYGPKG_HAL_ROM_MONITOR
requires { CYG_HAL_STARTUP == "RAM" }
description "
Support can be enabled for three different varieties of ROM monitor.
This support changes various eCos semantics such as the encoding
of diagnostic output, or the overriding of hardware interrupt
vectors.
Firstly there is \"Generic\" support which prevents the HAL
from overriding the hardware vectors that it does not use, to
instead allow an installed ROM monitor to handle them. This is
the most basic support which is likely to be common to most
implementations of ROM monitor.
\"CygMon\" provides support for the Cygnus ROM Monitor.
And finally, \"GDB_stubs\" provides support when GDB stubs are
included in the ROM monitor or boot ROM."
}
Or the ability to be configured as a ROM monitor:
cdl_option CYGSEM_HAL_ROM_MONITOR {
display "Behave as a ROM monitor"
flavor bool
default_value 0
parent CYGPKG_HAL_ROM_MONITOR
requires { CYG_HAL_STARTUP == "ROM" }
description "
Enable this option if this program is to be used as a ROM monitor,
i.e. applications will be loaded into RAM on the board, and this
ROM monitor may process exceptions or interrupts generated from the
application. This enables features such as utilizing a separate
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