common.cdl

Intel XScale PXA255 引导Linux的Redboot 版bootloader源代码！

# ====================================================================
#
#      common.cdl
#
#      HAL common configuration data
#
# ====================================================================
#####COPYRIGHTBEGIN####
#                                                                          
# -------------------------------------------                              
# The contents of this file are subject to the Red Hat eCos Public License 
# Version 1.1 (the "License"); you may not use this file except in         
# compliance with the License.  You may obtain a copy of the License at    
# http://www.redhat.com/                                                   
#                                                                          
# Software distributed under the License is distributed on an "AS IS"      
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
# License for the specific language governing rights and limitations under 
# the License.                                                             
#                                                                          
# The Original Code is eCos - Embedded Configurable Operating System,      
# released September 30, 1998.                                             
#                                                                          
# The Initial Developer of the Original Code is Red Hat.                   
# Portions created by Red Hat are                                          
# Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
# All Rights Reserved.                                                     
# -------------------------------------------                              
#                                                                          
#####COPYRIGHTEND####
# ====================================================================
######DESCRIPTIONBEGIN####
#
# Author(s):      jskov
# Original data:  nickg,jskov,jlarmour
# Contributors:
# Date:           1999-07-02
#
#####DESCRIPTIONEND####
#
# ====================================================================

cdl_option CYGFUN_HAL_COMMON_KERNEL_SUPPORT {
    display       "Provide eCos kernel support"
    requires      CYGPKG_KERNEL
    default_value CYGPKG_KERNEL
    description   "
        The HAL can be configured to either support the full eCos
        kernel, or to support only very simple applications which do
        not require a full kernel. If kernel support is not required
        then some of the startup, exception, and interrupt handling
        code can be eliminated."
}

cdl_interface CYGINT_HAL_DIAG_DISABLE_GDB_PROTOCOL_SUPPORTED {
    display "HAL allows GDB protocol to be disabled for..."
    no_define
}

cdl_option CYGDBG_HAL_DIAG_DISABLE_GDB_PROTOCOL {
    display       "Disable GDB protocol for diagnostic output"
    active_if     CYGINT_HAL_DIAG_DISABLE_GDB_PROTOCOL_SUPPORTED
    default_value 0
    description "
        This option forces diagnostic output to not use the GDB
        protocol.  Most programs will use the GDB protocol for
        diagnostic I/O because of the environment.  This option
        allows for an explicit override in these cases."
}

# NOTE: The requirement for kernel exception support is bogus in that
# the user can supply a deliver_exception function herself. In that
# case, however, it is easy to force the kernel option off while leaving
# this one on.  Having the requirement prevents accidental invalid
# configurations of the kernel.
cdl_option CYGPKG_HAL_EXCEPTIONS {
    display       "HAL exception support"
    requires      CYGPKG_KERNEL_EXCEPTIONS
    default_value CYGPKG_KERNEL_EXCEPTIONS
    description   "
        When a processor exception occurs, for example an attempt to
        execute an illegal instruction or to perform a divide by
        zero, this exception may be handled in a number of different
        ways. If the target system has gdb support then typically
        the exception will be handled by gdb code. Otherwise if the
        HAL exception support is enabled then the HAL will invoke a
        routine deliver_exception(). Typically this routine will be
        provided by the eCos kernel, but it is possible for
        application code to provide its own implementation. If the
        HAL exception support is not enabled and a processor
        exception occurs then the behaviour of the system is
        undefined."
}

cdl_option CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG {
    display       "Stop calling constructors early"
    requires      CYGSEM_LIBC_INVOKE_DEFAULT_STATIC_CONSTRUCTORS
    default_value 0
    description   "
        This option supports environments where some constructors
        must be run in the context of a thread rather than at
        simple system startup time. A boolean flag named
        cyg_hal_stop_constructors is set to 1 when constructors
        should no longer be invoked. It is up to some other
        package to deal with the rest of the constructors.
        In the current version this is only possible with the
        C library."
}

cdl_option CYGSEM_HAL_INSTALL_MMU_TABLES {
    display        "Install MMU tables."
    default_value  1
    description    "This option controls whether this application installs
       its own Memory Management Unit (MMU) tables, or relies on the
       existing environment to run."
}

cdl_option CYGSEM_HAL_STATIC_MMU_TABLES {
    display        "Use static MMU tables."
    default_value  0
    requires       CYGSEM_HAL_INSTALL_MMU_TABLES
    description "This option defines an environment where any Memory
       Management Unit (MMU) tables are constant.  Normally used by ROM
       based environments, this provides a way to save RAM usage which
       would otherwise be required for these tables."
}