The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/conf/MINIMAL

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    1 #
    2 # MINIMAL -- Mostly Minimal kernel configuration file for FreeBSD/i386
    3 #
    4 # Many definitions of minimal are possible. The one this file follows is
    5 # GENERIC, minus all functionality that can be replaced by loading kernel
    6 # modules.
    7 #
    8 # Exceptions:
    9 # o While UFS is buildable as a module, the current module lacks
   10 #   some features (ACL, GJOURNAL) that GENERIC includes.
   11 # o acpi as a module has been reported flakey and not well tested, so
   12 #   is included in the kernel.
   13 # o (non-loaded) random is included due to uncertainty...
   14 # o Many networking things are included
   15 #
   16 # For now, please run changes to these list past imp@freebsd.org
   17 #
   18 # For more information on this file, please read the config(5) manual page,
   19 # and/or the handbook section on Kernel Configuration Files:
   20 #
   21 #    https://docs.freebsd.org/en/books/handbook/kernelconfig/#kernelconfig-config
   22 #
   23 # The handbook is also available locally in /usr/share/doc/handbook
   24 # if you've installed the doc distribution, otherwise always see the
   25 # FreeBSD World Wide Web server (https://www.FreeBSD.org/) for the
   26 # latest information.
   27 #
   28 # An exhaustive list of options and more detailed explanations of the
   29 # device lines is also present in the ../../conf/NOTES and NOTES files.
   30 # If you are in doubt as to the purpose or necessity of a line, check first
   31 # in NOTES.
   32 #
   33 # $FreeBSD$
   34 
   35 cpu             I486_CPU
   36 cpu             I586_CPU
   37 cpu             I686_CPU
   38 ident           MINIMAL
   39 
   40 makeoptions     DEBUG=-g                # Build kernel with gdb(1) debug symbols
   41 makeoptions     WITH_CTF=1              # Run ctfconvert(1) for DTrace support
   42 
   43 options         SCHED_ULE               # ULE scheduler
   44 options         PREEMPTION              # Enable kernel thread preemption
   45 options         INET                    # InterNETworking
   46 options         INET6                   # IPv6 communications protocols
   47 options         TCP_OFFLOAD             # TCP offload
   48 options         SCTP_SUPPORT            # Allow kldload of SCTP
   49 options         FFS                     # Berkeley Fast Filesystem
   50 options         SOFTUPDATES             # Enable FFS soft updates support
   51 options         UFS_ACL                 # Support for access control lists
   52 options         UFS_DIRHASH             # Improve performance on big directories
   53 options         UFS_GJOURNAL            # Enable gjournal-based UFS journaling
   54 options         QUOTA                   # Enable disk quotas for UFS
   55 options         MD_ROOT                 # MD is a potential root device
   56 options         COMPAT_FREEBSD4         # Compatible with FreeBSD4
   57 options         COMPAT_FREEBSD5         # Compatible with FreeBSD5
   58 options         COMPAT_FREEBSD6         # Compatible with FreeBSD6
   59 options         COMPAT_FREEBSD7         # Compatible with FreeBSD7
   60 options         COMPAT_FREEBSD9         # Compatible with FreeBSD9
   61 options         COMPAT_FREEBSD10        # Compatible with FreeBSD10
   62 options         COMPAT_FREEBSD11        # Compatible with FreeBSD11
   63 options         COMPAT_FREEBSD12        # Compatible with FreeBSD12
   64 options         COMPAT_FREEBSD13        # Compatible with FreeBSD13
   65 options         SCSI_DELAY=5000         # Delay (in ms) before probing SCSI
   66 options         KTRACE                  # ktrace(1) support
   67 options         STACK                   # stack(9) support
   68 options         SYSVSHM                 # SYSV-style shared memory
   69 options         SYSVMSG                 # SYSV-style message queues
   70 options         SYSVSEM                 # SYSV-style semaphores
   71 options         _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
   72 options         PRINTF_BUFR_SIZE=128    # Prevent printf output being interspersed.
   73 options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev
   74 options         HWPMC_HOOKS             # Necessary kernel hooks for hwpmc(4)
   75 options         AUDIT                   # Security event auditing
   76 options         CAPABILITY_MODE         # Capsicum capability mode
   77 options         CAPABILITIES            # Capsicum capabilities
   78 options         MAC                     # TrustedBSD MAC Framework
   79 options         KDTRACE_FRAME           # Ensure frames are compiled in
   80 options         KDTRACE_HOOKS           # Kernel DTrace hooks
   81 options         DDB_CTF                 # Kernel ELF linker loads CTF data
   82 options         INCLUDE_CONFIG_FILE     # Include this file in kernel
   83 
   84 # Debugging support.  Always need this:
   85 options         KDB                     # Enable kernel debugger support.
   86 options         KDB_TRACE               # Print a stack trace for a panic.
   87 # For full debugger support use (turn off in stable branch):
   88 options         DDB                     # Support DDB.
   89 options         GDB                     # Support remote GDB.
   90 options         DEADLKRES               # Enable the deadlock resolver
   91 options         INVARIANTS              # Enable calls of extra sanity checking
   92 options         INVARIANT_SUPPORT       # Extra sanity checks of internal structures, required by INVARIANTS
   93 options         WITNESS                 # Enable checks to detect deadlocks and cycles
   94 options         WITNESS_SKIPSPIN        # Don't run witness on spinlocks for speed
   95 options         MALLOC_DEBUG_MAXZONES=8 # Separate malloc(9) zones
   96 options         VERBOSE_SYSINIT=0       # Support debug.verbose_sysinit, off by default
   97 
   98 # Make an SMP-capable kernel by default
   99 options         SMP                     # Symmetric MultiProcessor Kernel
  100 options         EARLY_AP_STARTUP
  101 device          apic
  102 
  103 # CPU frequency control
  104 device          cpufreq
  105 
  106 # Bus support.
  107 device          acpi
  108 device          smbios
  109 device          pci
  110 
  111 # atkbdc0 controls both the keyboard and the PS/2 mouse
  112 device          atkbdc                  # AT keyboard controller
  113 device          atkbd                   # AT keyboard
  114 device          psm                     # PS/2 mouse
  115 
  116 device          kbdmux                  # keyboard multiplexer
  117 
  118 # syscons is the legacy console driver, resembling an SCO console
  119 device          vga                     # VGA video card driver
  120 device          splash                  # Splash screen and screen saver support
  121 device          sc
  122 options         SC_PIXEL_MODE           # add support for the raster text mode
  123 
  124 # vt is the default video console driver
  125 device          vt
  126 device          vt_vga
  127 device          vt_efifb
  128 device          vt_vbefb
  129 
  130 device          agp                     # support several AGP chipsets
  131 
  132 # Pseudo devices.
  133 device          loop                    # Network loopback
  134 device          padlock_rng             # VIA Padlock RNG
  135 device          rdrand_rng              # Intel Bull Mountain RNG
  136 device          ether                   # Ethernet support
  137 device          vlan                    # 802.1Q VLAN support
  138 device          tuntap                  # Packet tunnel.
  139 device          gif                     # IPv6 and IPv4 tunneling
  140 
  141 # The `bpf' device enables the Berkeley Packet Filter.
  142 # Be aware of the administrative consequences of enabling this!
  143 # Note that 'bpf' is required for DHCP.
  144 device          bpf                     # Berkeley packet filter
  145 
  146 # Linux KVM paravirtualization support
  147 device          kvm_clock               # KVM paravirtual clock driver
  148 
  149 # Xen HVM Guest Optimizations
  150 # NOTE: XENHVM depends on xenpci.  They must be added or removed together.
  151 options         XENHVM                  # Xen HVM kernel infrastructure
  152 device          xenpci                  # Xen HVM Hypervisor services driver
  153 device          xentimer        # Xen x86 PV timer device
  154 
  155 # evdev interface
  156 options         EVDEV_SUPPORT           # evdev support in legacy drivers
  157 device          evdev                   # input event device support
  158 device          uinput                  # install /dev/uinput cdev

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