NOTES revision 185522
1# 2# NOTES -- Lines that can be cut/pasted into kernel and hints configs. 3# 4# This file contains machine dependent kernel configuration notes. For 5# machine independent notes, look in /sys/conf/NOTES. 6# 7# $FreeBSD: head/sys/pc98/conf/NOTES 185522 2008-12-01 16:53:01Z sam $ 8# 9 10# 11# We want LINT to cover profiling as well. 12profile 2 13 14 15##################################################################### 16# SMP OPTIONS: 17# 18# The apic device enables the use of the I/O APIC for interrupt delivery. 19# The apic device can be used in both UP and SMP kernels, but is required 20# for SMP kernels. Thus, the apic device is not strictly an SMP option, 21# but it is a prerequisite for SMP. 22# 23 24# Mandatory: 25device apic # I/O apic 26 27# 28# Watchdog routines. 29# 30options MP_WATCHDOG 31 32# Debugging options. 33# 34options STOP_NMI # Stop CPUS using NMI instead of IPI 35 36 37 38##################################################################### 39# CPU OPTIONS 40 41# 42# You must specify at least one CPU (the one you intend to run on); 43# deleting the specification for CPUs you don't need to use may make 44# parts of the system run faster. 45# 46cpu I486_CPU 47cpu I586_CPU # aka Pentium(tm) 48cpu I686_CPU # aka Pentium Pro(tm) 49 50# 51# Options for CPU features. 52# 53# CPU_BLUELIGHTNING_3X enables triple-clock mode on IBM Blue Lightning 54# CPU if CPU supports it. The default is double-clock mode on 55# BlueLightning CPU box. 56# 57# CPU_BLUELIGHTNING_FPU_OP_CACHE enables FPU operand cache on IBM 58# BlueLightning CPU. It works only with Cyrix FPU, and this option 59# should not be used with Intel FPU. 60# 61# CPU_BTB_EN enables branch target buffer on Cyrix 5x86 (NOTE 1). 62# 63# CPU_CYRIX_NO_LOCK enables weak locking for the entire address space 64# of Cyrix 6x86 and 6x86MX CPUs by setting the NO_LOCK bit of CCR1. 65# Otherwise, the NO_LOCK bit of CCR1 is cleared. (NOTE 3) 66# 67# CPU_DIRECT_MAPPED_CACHE sets L1 cache of Cyrix 486DLC CPU in direct 68# mapped mode. Default is 2-way set associative mode. 69# 70# CPU_DISABLE_5X86_LSSER disables load store serialize (i.e., enables 71# reorder). This option should not be used if you use memory mapped 72# I/O device(s). 73# 74# CPU_DISABLE_CMPXCHG disables the CMPXCHG instruction on > i386 IA32 75# machines. VmWare 3.x seems to emulate this instruction poorly, causing 76# the guest OS to run very slowly. This problem appears to be fixed in 77# VmWare 4.x, at least in version 4.5.2, so that enabling this option with 78# VmWare 4.x will result in locking operations to be 20-30 times slower. 79# Enabling this with an SMP kernel will cause the kernel to be unusable. 80# 81# CPU_DISABLE_SSE explicitly prevents I686_CPU from turning on SSE. 82# 83# CPU_FASTER_5X86_FPU enables faster FPU exception handler. 84# 85# CPU_I486_ON_386 enables CPU cache on i486 based CPU upgrade products 86# for i386 machines. 87# 88# CPU_IORT defines I/O clock delay time (NOTE 1). Default values of 89# I/O clock delay time on Cyrix 5x86 and 6x86 are 0 and 7,respectively 90# (no clock delay). 91# 92# CPU_L2_LATENCY specifies the L2 cache latency value. This option is used 93# only when CPU_PPRO2CELERON is defined and Mendocino Celeron is detected. 94# The default value is 5. 95# 96# CPU_LOOP_EN prevents flushing the prefetch buffer if the destination 97# of a jump is already present in the prefetch buffer on Cyrix 5x86(NOTE 98# 1). 99# 100# CPU_PPRO2CELERON enables L2 cache of Mendocino Celeron CPUs. This option 101# is useful when you use Socket 8 to Socket 370 converter, because most Pentium 102# Pro BIOSs do not enable L2 cache of Mendocino Celeron CPUs. 103# 104# CPU_RSTK_EN enables return stack on Cyrix 5x86 (NOTE 1). 105# 106# CPU_SUSP_HLT enables suspend on HALT. If this option is set, CPU 107# enters suspend mode following execution of HALT instruction. 108# 109# CPU_UPGRADE_HW_CACHE eliminates unneeded cache flush instruction(s). 110# 111# CPU_WT_ALLOC enables write allocation on Cyrix 6x86/6x86MX and AMD 112# K5/K6/K6-2 CPUs. 113# 114# CYRIX_CACHE_WORKS enables CPU cache on Cyrix 486 CPUs with cache 115# flush at hold state. 116# 117# CYRIX_CACHE_REALLY_WORKS enables (1) CPU cache on Cyrix 486 CPUs 118# without cache flush at hold state, and (2) write-back CPU cache on 119# Cyrix 6x86 whose revision < 2.7 (NOTE 2). 120# 121# NO_F00F_HACK disables the hack that prevents Pentiums (and ONLY 122# Pentiums) from locking up when a LOCK CMPXCHG8B instruction is 123# executed. This option is only needed if I586_CPU is also defined, 124# and should be included for any non-Pentium CPU that defines it. 125# 126# NO_MEMORY_HOLE is an optimisation for systems with AMD K6 processors 127# which indicates that the 15-16MB range is *definitely* not being 128# occupied by an ISA memory hole. 129# 130# NOTE 1: The options, CPU_BTB_EN, CPU_LOOP_EN, CPU_IORT, 131# CPU_LOOP_EN and CPU_RSTK_EN should not be used because of CPU bugs. 132# These options may crash your system. 133# 134# NOTE 2: If CYRIX_CACHE_REALLY_WORKS is not set, CPU cache is enabled 135# in write-through mode when revision < 2.7. If revision of Cyrix 136# 6x86 >= 2.7, CPU cache is always enabled in write-back mode. 137# 138# NOTE 3: This option may cause failures for software that requires 139# locked cycles in order to operate correctly. 140# 141options CPU_BLUELIGHTNING_3X 142options CPU_BLUELIGHTNING_FPU_OP_CACHE 143options CPU_BTB_EN 144options CPU_DIRECT_MAPPED_CACHE 145options CPU_DISABLE_5X86_LSSER 146options CPU_DISABLE_CMPXCHG 147#options CPU_DISABLE_SSE 148options CPU_FASTER_5X86_FPU 149options CPU_I486_ON_386 150options CPU_IORT 151options CPU_L2_LATENCY=5 152options CPU_LOOP_EN 153options CPU_PPRO2CELERON 154options CPU_RSTK_EN 155options CPU_SUSP_HLT 156options CPU_UPGRADE_HW_CACHE 157options CPU_WT_ALLOC 158options CYRIX_CACHE_WORKS 159options CYRIX_CACHE_REALLY_WORKS 160#options NO_F00F_HACK 161 162# Debug options 163options NPX_DEBUG # enable npx debugging 164 165# 166# PERFMON causes the driver for Pentium/Pentium Pro performance counters 167# to be compiled. See perfmon(4) for more information. 168# 169options PERFMON 170 171 172##################################################################### 173# NETWORKING OPTIONS 174 175# 176# DEVICE_POLLING adds support for mixed interrupt-polling handling 177# of network device drivers, which has significant benefits in terms 178# of robustness to overloads and responsivity, as well as permitting 179# accurate scheduling of the CPU time between kernel network processing 180# and other activities. The drawback is a moderate (up to 1/HZ seconds) 181# potential increase in response times. 182# It is strongly recommended to use HZ=1000 or 2000 with DEVICE_POLLING 183# to achieve smoother behaviour. 184# Additionally, you can enable/disable polling at runtime with help of 185# the ifconfig(8) utility, and select the CPU fraction reserved to 186# userland with the sysctl variable kern.polling.user_frac 187# (default 50, range 0..100). 188# 189# Not all device drivers support this mode of operation at the time of 190# this writing. See polling(4) for more details. 191 192options DEVICE_POLLING 193 194# BPF_JITTER adds support for BPF just-in-time compiler. 195 196options BPF_JITTER 197 198 199##################################################################### 200# MISCELLANEOUS DEVICES AND OPTIONS 201 202# 203# sio: serial ports (see sio(4)), including support for various 204# PC Card devices, such as Modem and NICs 205# 206#device sio 207hint.sio.0.at="isa" 208hint.sio.0.port="0x3F8" 209hint.sio.0.flags="0x10" 210hint.sio.0.irq="4" 211 212# `flags' specific to sio(4). 213# 0x10 enable console support for this unit. Other console flags 214# (if applicable) are ignored unless this is set. Enabling 215# console support does not make the unit the preferred console. 216# Boot with -h or set boot_serial=YES in the loader. For sio(4) 217# specifically, the 0x20 flag can also be set (see above). 218# Currently, at most one unit can have console support; the 219# first one (in config file order) with this flag set is 220# preferred. Setting this flag for sio0 gives the old behaviour. 221# 0x20 force this unit to be the console (unless there is another 222# higher priority console). This replaces the COMCONSOLE option. 223# 0x40 reserve this unit for low level console operations. Do not 224# access the device in any normal way. 225# 0x80 use this port for serial line gdb support in ddb. Also known 226# as debug port. 227# PnP `flags' 228# 0x1 disable probing of this device. Used to prevent your modem 229# from being attached as a PnP modem. 230# Other flags for sio that aren't documented in the man page. 231# 0x20000 enable hardware RTS/CTS and larger FIFOs. Only works for 232# ST16650A-compatible UARTs. 233 234# Options for sio: 235options COM_ESP # Code for Hayes ESP. 236options COM_MULTIPORT # Code for some cards with shared IRQs. 237options CONSPEED=115200 # Speed for serial console 238 # (default 9600). 239 240device speaker #Play IBM BASIC-style noises out your speaker 241hint.speaker.0.at="isa" 242hint.speaker.0.port="0x35" 243device gzip #Exec gzipped a.out's. REQUIRES COMPAT_AOUT! 244device apm_saver # Requires APM 245 246 247##################################################################### 248# HARDWARE BUS CONFIGURATION 249 250# 251# ISA bus 252# 253device isa 254 255# 256# Options for `isa': 257# 258# AUTO_EOI_1 enables the `automatic EOI' feature for the master 8259A 259# interrupt controller. This saves about 0.7-1.25 usec for each interrupt. 260# This option breaks suspend/resume on some portables. 261# 262# MAXMEM specifies the amount of RAM on the machine; if this is not 263# specified, FreeBSD will first read the amount of memory from the CMOS 264# RAM, so the amount of memory will initially be limited to 64MB or 16MB 265# depending on the BIOS. If the BIOS reports 64MB, a memory probe will 266# then attempt to detect the installed amount of RAM. If this probe 267# fails to detect >64MB RAM you will have to use the MAXMEM option. 268# The amount is in kilobytes, so for a machine with 128MB of RAM, it would 269# be 131072 (128 * 1024). 270# 271# BROKEN_KEYBOARD_RESET disables the use of the keyboard controller to 272# reset the CPU for reboot. This is needed on some systems with broken 273# keyboard controllers. 274 275options AUTO_EOI_1 276 277options MAXMEM=(128*1024) 278#options BROKEN_KEYBOARD_RESET 279options EPSON_BOUNCEDMA 280options EPSON_MEMWIN 281 282# 283# PCI bus & PCI options: 284# 285device pci 286 287# 288# AGP GART support 289device agp 290 291 292##################################################################### 293# HARDWARE DEVICE CONFIGURATION 294 295# PC98 keyboard 296device pckbd 297hint.pckbd.0.at="isa" 298hint.pckbd.0.port="0x041" 299hint.pckbd.0.irq="1" 300 301# GDC screen 302device gdc 303hint.gdc.0.at="isa" 304options LINE30 305 306# 307# The Numeric Processing eXtension driver. This is non-optional. 308device npx 309 310# 311# `flags' for npx0: 312# 0x01 don't use the npx registers to optimize bcopy. 313# 0x02 don't use the npx registers to optimize bzero. 314# 0x04 don't use the npx registers to optimize copyin or copyout. 315# The npx registers are normally used to optimize copying and zeroing when 316# all of the following conditions are satisfied: 317# I586_CPU is an option 318# the cpu is an i586 (perhaps not a Pentium) 319# the probe for npx0 succeeds 320# INT 16 exception handling works. 321# Then copying and zeroing using the npx registers is normally 30-100% faster. 322# The flags can be used to control cases where it doesn't work or is slower. 323# Setting them at boot time using hints works right (the optimizations 324# are not used until later in the bootstrap when npx0 is attached). 325# Flag 0x08 automatically disables the i586 optimized routines. 326# 327 328# 329# Optional devices: 330# 331 332# 3Dfx Voodoo Graphics, Voodoo II /dev/3dfx CDEV support. This will create 333# the /dev/3dfx0 device to work with glide implementations. This should get 334# linked to /dev/3dfx and /dev/voodoo. Note that this is not the same as 335# the tdfx DRI module from XFree86 and is completely unrelated. 336# 337# To enable Linuxulator support, one must also include COMPAT_LINUX in the 338# config as well. The other option is to load both as modules. 339 340device tdfx # Enable 3Dfx Voodoo support 341device tdfx_linux # Enable Linuxulator support 342 343# Direct Rendering modules for 3D acceleration. 344device drm # DRM core module required by DRM drivers 345device mach64drm # ATI Rage Pro, Rage Mobility P/M, Rage XL 346device mgadrm # AGP Matrox G200, G400, G450, G550 347device r128drm # ATI Rage 128 348device radeondrm # ATI Radeon 349device savagedrm # S3 Savage3D, Savage4 350device sisdrm # SiS 300/305, 540, 630 351device tdfxdrm # 3dfx Voodoo 3/4/5 and Banshee 352options DRM_DEBUG # Include debug printfs (slow) 353 354# 355# Bus mouse 356# 357device mse 358hint.mse.0.at="isa" 359hint.mse.0.port="0x7fd9" 360hint.mse.0.irq="13" 361 362# 363# Network interfaces: 364# 365 366# ar: Arnet SYNC/570i hdlc sync 2/4 port V.35/X.21 serial driver 367# (requires sppp) 368# ath: Atheros a/b/g WiFi adapters (requires ath_hal and wlan) 369# ce: Cronyx Tau-PCI/32 sync single/dual port G.703/E1 serial adaptor 370# with 32 HDLC subchannels (requires sppp (default), or NETGRAPH if 371# NETGRAPH_CRONYX is configured) 372# cp: Cronyx Tau-PCI sync single/dual/four port 373# V.35/RS-232/RS-530/RS-449/X.21/G.703/E1/E3/T3/STS-1 374# serial adaptor (requires sppp (default), or NETGRAPH if 375# NETGRAPH_CRONYX is configured) 376# cs: IBM Etherjet and other Crystal Semi CS89x0-based adapters and pccard 377# ed: Western Digital and SMC 80xx; Novell NE1000 and NE2000; 3Com 3C503 378# HP PC Lan+, various PC Card devices 379# (requires miibus) 380# ie: AT&T StarLAN 10 and EN100; 3Com 3C507; unknown NI5210; 381# Intel EtherExpress 382# ral: Ralink Technology IEEE 802.11 wireless adapter 383# sbni: Granch SBNI12-xx ISA and PCI adapters 384# sr: RISCom/N2 hdlc sync 1/2 port V.35/X.21 serial driver (requires sppp) 385# ural: Ralink Technology RT2500USB IEEE 802.11 wireless adapter 386 387# Order for ISA/EISA devices is important here 388 389device ar 390device ce 391device cp 392device cs 393device ed 394hint.ed.0.at="isa" 395hint.ed.0.port="0x280" 396hint.ed.0.irq="5" 397hint.ed.0.maddr="0xd8000" 398device ie # Hints only required for Starlan 399hint.ie.2.at="isa" 400hint.ie.2.port="0x300" 401hint.ie.2.irq="5" 402hint.ie.2.maddr="0xd0000" 403# Hint for the PC98-only C-NET(98)S C-bus front-end of le(4). 404hint.le.0.at="isa" 405hint.le.0.port="0x03d0" 406hint.le.0.irq="6" 407device ral 408device sbni 409hint.sbni.0.at="isa" 410hint.sbni.0.port="0x210" 411hint.sbni.0.irq="0xefdead" 412hint.sbni.0.flags="0" 413device snc 414hint.snc.0.at="isa" 415hint.snc.0.port="0x888" 416hint.snc.0.irq="6" 417hint.snc.0.maddr="0xc0000" 418device sr 419device ural 420 421device ath # Atheros pci/cardbus NIC's 422device ath_hal # pci/cardbus chip support 423#device ath_ar5210 # AR5210 chips 424#device ath_ar5211 # AR5211 chips 425#device ath_ar5212 # AR5212 chips 426#device ath_rf2413 427#device ath_rf2417 428#device ath_rf2425 429#device ath_rf5111 430#device ath_rf5112 431#device ath_rf5413 432#device ath_ar5416 # AR5416 chips 433options AH_SUPPORT_AR5416 # enable AR5416 tx/rx descriptors 434device ath_rate_sample # SampleRate tx rate control for ath 435 436# 437# SCSI host adapters: 438# 439# ct: WD33C93[ABC] based SCSI host adapters. 440# ncv: NCR 53C500 based SCSI host adapters. 441# nsp: Workbit Ninja SCSI-3 based PC Card SCSI host adapters. 442# stg: TMC 18C30, 18C50 based SCSI host adapters. 443 444device ct 445hint.ct.0.at="isa" 446device ncv 447device nsp 448device stg 449 450# 451# SafeNet crypto driver: can be moved to the MI NOTES as soon as 452# it's tested on a big-endian machine 453# 454device safe # SafeNet 1141 455options SAFE_DEBUG # enable debugging support: hw.safe.debug 456options SAFE_RNDTEST # enable rndtest support 457 458##################################################################### 459 460# 461# Miscellaneous hardware: 462# 463# apm: Laptop Advanced Power Management (experimental) 464# pmtimer: Timer device driver for power management events (APM or ACPI) 465 466# Notes on APM 467# The flags takes the following meaning for apm0: 468# 0x0020 Statclock is broken. 469 470device apm 471hint.apm.0.flags="0x20" 472device canbus 473device canbepm 474device olpt 475hint.olpt.0.at="isa" 476hint.olpt.0.port="0x040" 477device pmc 478hint.pmc.0.at="isa" 479hint.pmc.0.port="0x8f0" 480device pmtimer # Adjust system timer at wakeup time 481 482# 483# Laptop/Notebook options: 484# 485# See also: 486# apm under `Miscellaneous hardware' 487# above. 488 489# For older notebooks that signal a powerfail condition (external 490# power supply dropped, or battery state low) by issuing an NMI: 491 492options POWERFAIL_NMI # make it beep instead of panicing 493 494# 495# Set the number of PV entries per process. Increasing this can 496# stop panics related to heavy use of shared memory. However, that can 497# (combined with large amounts of physical memory) cause panics at 498# boot time due the kernel running out of VM space. 499# 500# If you're tweaking this, you might also want to increase the sysctls 501# "vm.v_free_min", "vm.v_free_reserved", and "vm.v_free_target". 502# 503# The value below is the one more than the default. 504# 505options PMAP_SHPGPERPROC=201 506 507# 508# Change the size of the kernel virtual address space. Due to 509# constraints in loader(8) on i386, this must be a multiple of 4. 510# 256 = 1 GB of kernel address space. Increasing this also causes 511# a reduction of the address space in user processes. 512 splits 512# the 4GB cpu address space in half (2GB user, 2GB kernel). 513# 514options KVA_PAGES=260 515 516 517##################################################################### 518# ABI Emulation 519 520# Enable iBCS2 runtime support for SCO and ISC binaries 521options IBCS2 522 523# Emulate spx device for client side of SVR3 local X interface 524options SPX_HACK 525 526# Enable Linux ABI emulation 527options COMPAT_LINUX 528 529# Enable i386 a.out binary support 530options COMPAT_AOUT 531 532# Enable the linux-like proc filesystem support (requires COMPAT_LINUX 533# and PSEUDOFS) 534options LINPROCFS 535 536# Enable the linux-like sys filesystem support (requires COMPAT_LINUX 537# and PSEUDOFS) 538options LINSYSFS 539 540# 541# SysVR4 ABI emulation 542# 543# The svr4 ABI emulator can be statically compiled into the kernel or loaded as 544# a KLD module. 545# The STREAMS network emulation code can also be compiled statically or as a 546# module. If loaded as a module, it must be loaded before the svr4 module 547# (the /usr/sbin/svr4 script does this for you). If compiling statically, 548# the `streams' device must be configured into any kernel which also 549# specifies COMPAT_SVR4. It is possible to have a statically-configured 550# STREAMS device and a dynamically loadable svr4 emulator; the /usr/sbin/svr4 551# script understands that it doesn't need to load the `streams' module under 552# those circumstances. 553# Caveat: At this time, `options KTRACE' is required for the svr4 emulator 554# (whether static or dynamic). 555# 556options COMPAT_SVR4 # build emulator statically 557options DEBUG_SVR4 # enable verbose debugging 558device streams # STREAMS network driver (required for svr4). 559 560 561##################################################################### 562# VM OPTIONS 563 564# Disable the 4 MByte page PSE CPU feature. The PSE feature allows the 565# kernel to use 4 MByte pages to map the kernel instead of 4k pages. 566# This saves on the amount of memory needed for page tables needed to 567# map the kernel. You should only disable this feature as a temporary 568# workaround if you are having problems with it enabled. 569# 570#options DISABLE_PSE 571 572# Disable the global pages PGE CPU feature. The PGE feature allows pages 573# to be marked with the PG_G bit. TLB entries for these pages are not 574# flushed from the cache when %cr3 is reloaded. This can make context 575# switches less expensive. You should only disable this feature as a 576# temporary workaround if you are having problems with it enabled. 577# 578#options DISABLE_PG_G 579 580# KSTACK_PAGES is the number of memory pages to assign to the kernel 581# stack of each thread. 582 583options KSTACK_PAGES=3 584 585##################################################################### 586 587# More undocumented options for linting. 588# Note that documenting these are not considered an affront. 589 590options FB_INSTALL_CDEV # install a CDEV entry in /dev 591 592options I586_PMC_GUPROF=0x70000 593options KBDIO_DEBUG=2 594options KBD_MAXRETRY=4 595options KBD_MAXWAIT=6 596options KBD_RESETDELAY=201 597 598options TIMER_FREQ=((14318182+6)/12) 599 600options VM_KMEM_SIZE 601options VM_KMEM_SIZE_MAX 602options VM_KMEM_SIZE_SCALE 603 604 605##################################################################### 606# Devices we don't want to deal with 607 608nodevice bt 609nodevice adw 610nodevice aha 611nodevice ahb 612nodevice ahd 613nodevice mpt 614nodevice trm 615nodevice wds 616nodevice dpt 617nodevice ciss 618nodevice iir 619nodevice mly 620nodevice ida # Compaq Smart RAID 621nodevice mlx # Mylex DAC960 622nodevice amr # AMI MegaRAID 623nodevice twe # 3ware ATA RAID 624nodevice ataraid 625nodevice cm 626nodevice ex 627nodevice fea 628nodevice intpm 629nodevice alpm 630nodevice ichsmb 631nodevice viapm 632nodevice amdpm 633nodevice amdsmb 634nodevice nfpm 635nodevice nfsmb 636 637 638##################################################################### 639# Options we don't want to deal with 640 641nooption AHD_DEBUG 642nooption AHD_DEBUG_OPTS 643nooption AHD_REG_PRETTY_PRINT 644nooption ADW_ALLOW_MEMIO 645nooption DPT_LOST_IRQ 646nooption DPT_RESET_HBA 647nooption DPT_TIMEOUT_FACTOR 648nooption AAC_DEBUG 649 650 651##################################################################### 652# Make options we don't want to deal with 653