plan9.ini 21 KB

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  1. .TH PLAN9.INI 8
  2. .SH NAME
  3. plan9.ini \- configuration file for PCs
  4. .SH SYNOPSIS
  5. .I none
  6. .SH DESCRIPTION
  7. When booting Plan 9 on a PC, the DOS program
  8. .IR 9load (8)
  9. first reads a DOS file
  10. containing configuration information from the boot disk.
  11. This file,
  12. .BR plan9.ini ,
  13. looks like a shell script containing lines of the form
  14. .PP
  15. .EX
  16. name=\f2value\fP
  17. .EE
  18. .LP
  19. each of which defines a kernel or device parameter.
  20. .PP
  21. For devices, the generic format of
  22. .I value
  23. is
  24. .PP
  25. .EX
  26. type=TYPE [port=N] [irq=N] [mem=N] [size=N] [dma=N] [ea=N]
  27. .EE
  28. .LP
  29. specifying the controller type,
  30. the base I/O port of the interface, its interrupt
  31. level, the physical starting address of any mapped memory,
  32. the length in bytes of that memory, the DMA channel,
  33. and for Ethernets an override of the physical network address.
  34. Not all elements are relevant to all devices; the relevant values
  35. and their defaults are defined below in the description of each device.
  36. .PP
  37. The file is used by
  38. .B 9load
  39. and the kernel to configure the hardware available.
  40. The information it contains is also passed to the boot
  41. process, and subsequently other programs,
  42. as environment variables
  43. (see
  44. .IR boot (8)).
  45. However, values whose names begin with an asterisk
  46. .B *
  47. are used by the kernel and are not converted into environment variables.
  48. .PP
  49. The following sections describe how variables are used.
  50. .SS \fLetherX=value\fP
  51. This defines an Ethernet interface.
  52. .IR X ,
  53. a unique monotonically increasing number beginning at 0,
  54. identifies an Ethernet card to be probed at system boot.
  55. Probing stops when a card is found or there is no line for
  56. .BR etherX+1 .
  57. After probing as directed by the
  58. .BI ether X
  59. lines, any remaining ethernet cards that can be automatically
  60. detected are added.
  61. Almost all cards can be automatically detected.
  62. For debugging purposes, automatic probing can
  63. be disabled by specifying the line
  64. .BR *noetherprobe= .
  65. This automatic probing is only done by the kernel, not by
  66. .IR 9load (8).
  67. Thus, if you want to load a kernel over the ethernet, you need
  68. to specify an
  69. .B ether0
  70. line so that
  71. .I 9load
  72. can find the ethernet card, even if the kernel would
  73. have automatically detected it.
  74. .PP
  75. Some cards are software configurable and do not require all options.
  76. Unspecified options default to the factory defaults.
  77. .PP
  78. Known types are
  79. .TP
  80. .B ne2000
  81. Not software configurable. 16-bit card.
  82. Defaults are
  83. .EX
  84. port=0x300 irq=2 mem=0x04000 size=0x4000
  85. .EE
  86. The option (no value)
  87. .B nodummyrr
  88. is needed on some (near) clones to turn off a dummy remote read in the driver.
  89. .TP
  90. .B amd79c970
  91. The AMD PCnet PCI Ethernet Adapter (AM79C970).
  92. (This is the ethernet adapter used by VMware.)
  93. Completely configurable, no options need be given.
  94. .TP
  95. .B wd8003
  96. Includes WD8013 and SMC Elite and Elite Ultra cards. There are varying degrees
  97. of software configurability. Cards may be in either 8-bit or 16-bit slots.
  98. Defaults are
  99. .EX
  100. port=0x280 irq=3 mem=0xD0000 size=0x2000
  101. .EE
  102. BUG: On many machines only the 16 bit card works.
  103. .TP
  104. .B elnk3
  105. The 3COM Etherlink III series of cards including the 5x9, 59x, and 905 and 905B.
  106. Completely configurable, no options need be given.
  107. The media may be specified by setting
  108. .B media=
  109. to the value
  110. .BR 10BaseT ,
  111. .BR 10Base2 ,
  112. .BR 100BaseTX ,
  113. .BR 100BaseFX ,
  114. .BR aui ,
  115. and
  116. .BR mii .
  117. If you need to force full duplex, because for example the Ethernet switch does not negotiate correctly,
  118. just name the word (no value)
  119. .B fullduplex
  120. or
  121. .BR 100BASE-TXFD .
  122. Similarly, to force 100Mbit operation, specify
  123. .BR force100 .
  124. Port 0x110 is used for the little ISA configuration dance.
  125. .TP
  126. .B 3c589
  127. The 3COM 3C589 series PCMCIA cards, including the
  128. 3C562 and the 589E.
  129. There is no support for the modem on the 3C562.
  130. Completely configurable, no options need be given.
  131. Defaults are
  132. .EX
  133. port=0x240 irq=10
  134. .EE
  135. The media may be specified as
  136. .B media=10BaseT
  137. or
  138. .BR media=10Base2 .
  139. .TP
  140. .B ec2t
  141. The Linksys Combo PCMCIA EthernetCard (EC2T),
  142. EtherFast 10/100 PCMCIA cards (PCMPC100) and integrated controllers (PCM100),
  143. the Netgear FA410TX 10/100 PCMCIA card
  144. and the Accton EtherPair-PCMCIA (EN2216).
  145. Completely configurable, no options need be given.
  146. Defaults are
  147. .EX
  148. port=0x300 irq=9
  149. .EE
  150. These cards are NE2000 clones.
  151. Other NE2000 compatible PCMCIA cards may be tried
  152. with the option
  153. .EX
  154. id=string
  155. .EE
  156. where
  157. .B string
  158. is a unique identifier string contained in the attribute
  159. memory of the card (see
  160. .IR pcmcia (8));
  161. unlike most options in
  162. .BR plan9.ini ,
  163. this string is case-sensitive.
  164. The option
  165. .B dummyrr=[01]
  166. can be used to turn off (0) or on (1) a dummy remote read in the driver
  167. in such cases,
  168. depending on how NE2000 compatible they are.
  169. .TP
  170. .B i82557
  171. Cards using the Intel 8255[789] Fast Ethernet PCI Bus LAN Controller such as the
  172. Intel EtherExpress PRO/100B.
  173. Completely configurable, no options need be given.
  174. If you need to force the media, specify
  175. one of the options (no value)
  176. .BR 10BASE-T ,
  177. .BR 10BASE-2 ,
  178. .BR 10BASE-5 ,
  179. .BR 100BASE-TX ,
  180. .BR 10BASE-TFD ,
  181. .BR 100BASE-TXFD ,
  182. .BR 100BASE-T4 ,
  183. .BR 100BASE-FX ,
  184. or
  185. .BR 100BASE-FXFD .
  186. .TP
  187. .B 2114x
  188. Cards using the Digital Equipment (now Intel) 2114x PCI Fast Ethernet Adapter Controller,
  189. for example the Netgear FA310.
  190. Completely configurable, no options need be given.
  191. Media can be specified the same was as for the
  192. .BR i82557 .
  193. Some cards using the
  194. .B PNIC
  195. and
  196. .B PNIC2
  197. near-clone chips may also work.
  198. .\" .TP
  199. .\" .B ga620
  200. .\" Netgear GA620 and GA620T Gigabit Ethernet cards,
  201. .\" and other cards using the Alteon Acenic chip such as the
  202. .\" Alteon Acenic fiber and copper cards,
  203. .\" the DEC DEGPA-SA and the SGI Acenic.
  204. .\" Completely configurable.
  205. .TP
  206. .B wavelan
  207. Lucent Wavelan (Orinoco) IEEE 802.11b
  208. and compatible PCMCIA cards.
  209. Compatible cards include the Dell TrueMobile 1150
  210. and the Linksys Instant Wireless Network PC Card.
  211. Port and IRQ defaults are 0x180 and 3 respectively.
  212. These cards take a number of unique options to aid in
  213. identifying the card correctly on the 802.11b network.
  214. The network may be
  215. .I "ad hoc"
  216. or
  217. .I managed
  218. (i.e. use an access point):
  219. .EX
  220. mode=[adhoc, managed]
  221. .EE
  222. and defaults to
  223. .IR managed .
  224. The 802.11b network to attach to
  225. .RI ( managed
  226. mode)
  227. or identify as
  228. .RI ( "ad hoc"
  229. mode),
  230. is specified by
  231. .EX
  232. essid=string
  233. .EE
  234. and defaults to a null string.
  235. The card station name is given by
  236. .EX
  237. station=string
  238. .EE
  239. and defaults to
  240. .IR "Plan 9 STA" .
  241. The channel to use is given by
  242. .EX
  243. channel=number
  244. .EE
  245. where
  246. .I number
  247. lies in the range 1 to 16 inclusive;
  248. the channel is normally negotiated automatically.
  249. If the card is capable of encryption,
  250. the following options may be used:
  251. .EX
  252. crypt=[off, on]
  253. .EE
  254. and defaults to
  255. .IR on .
  256. .EX
  257. key\fIN\fP=string
  258. .EE
  259. sets the encryption key
  260. .I N
  261. (where
  262. .I N
  263. is in the range 1 to 4 inclusive) to
  264. .IR string ;
  265. this will also set the transmit key to
  266. .I N
  267. (see below).
  268. There are two formats for
  269. .I string
  270. which depend on the length of the string.
  271. If it is exactly 5 or 13 characters long it is assumed
  272. to be an alphanumeric key; if it is exactly 10 or 26 characters
  273. long the key is assumed to be in hex format (without a leading
  274. .IR 0x ).
  275. The lengths are checked,
  276. as is the format of a hex key.
  277. .EX
  278. txkey=number
  279. .EE
  280. sets the transmit key to use to be
  281. .I number
  282. in the range 1 to 4 inclusive.
  283. If it is desired to exclude or include unencrypted packets
  284. .EX
  285. clear=[off, on]
  286. .EE
  287. configures reception and defaults to inclusion.
  288. The defaults are intended to match the common case of
  289. a managed network with encryption and a typical entry would
  290. only require, for example
  291. .EX
  292. essid=left-armpit key1=afish key2=calledraawaru
  293. .EE
  294. if the port and IRQ defaults are used.
  295. These options may be set after boot by writing to the device's
  296. .I ctl
  297. file using a space as the separator between option and value, e.g.
  298. .EX
  299. echo 'key2 1d8f65c9a52d83c8e4b43f94af' > /net/ether0/0/ctl
  300. .EE
  301. .TP
  302. .B wavelanpci
  303. PCI ethernet adapters that use the same Wavelan
  304. programming interface.
  305. Currently the only tested cards are those based on the
  306. Intersil Prism 2.5 chipset.
  307. .TP
  308. .B 83815
  309. National Semiconductor DP83815-based adapters, notably
  310. the Netgear FA311, Netgear FA312, and various SiS built-in
  311. controllers such as the SiS900.
  312. On the SiS controllers, the ethernet address is not detected properly;
  313. specify it with an
  314. .B ea=
  315. attribute.
  316. .\" .TP
  317. .\" .B 83820
  318. .\" National Semiconductor DP83820-based gigabit ethernet adapters, notably
  319. .\" the D-Link DGE-500T.
  320. .TP
  321. .B rtl8139
  322. The Realtek 8139.
  323. .TP
  324. .B igbe
  325. The Intel 8254X Gigabit Ethernet controllers,
  326. as found on the Intel PRO/1000 adapters for copper (not fiber).
  327. .TP
  328. .B smc91cxx
  329. SMC 91cXX chip-based PCMCIA adapters, notably the SMC EtherEZ card.
  330. .TP
  331. .B sink
  332. A
  333. .B /dev/null
  334. for ethernet packets \(em the interface discards sent
  335. packets and never receives any.
  336. This is used to provide a test bed for
  337. some experimental ethernet bridging software.
  338. .SS \fLusbX=type=uhci port=xxx irq=xxx\fP
  339. This specifies the settings for a USB UHCI controller.
  340. Like the ethernet controllers, USB controllers are autodetected
  341. after scanning for the ones listed in
  342. .IR plan9.ini .
  343. Thus, most systems will not need a
  344. .B usbX
  345. line.
  346. Also like the ethernet controllers, USB autoprobing can be
  347. disabled by specifying the line
  348. .BR *nousbprobe= .
  349. .SS \fLscsiX=value\fP
  350. This defines a SCSI interface which cannot be automatically detected
  351. by the kernel.
  352. .PP
  353. Known types are
  354. .TP
  355. .B aha1542
  356. The Adaptec 154x series of controllers (and clones).
  357. Almost completely configurable, only the
  358. .EX
  359. port=0x300
  360. .EE
  361. option need be given.
  362. .PP
  363. NCR/Symbios/LSI Logic 53c8xx-based adapters
  364. and Mylex MultiMaster (Buslogic BT-*) adapters are
  365. automatically detected and need no entries.
  366. .PP
  367. By default, the NCR 53c8xx driver searches for up to 32 controllers.
  368. This can be changed by setting the variable
  369. .BR *maxsd53c8xx .
  370. .PP
  371. By default the Mylex driver resets SCSI cards by using
  372. both the hard reset and SCSI bus reset flags in the driver interface.
  373. If a variable
  374. .BR *noscsireset
  375. is defined, the SCSI bus reset flag is omitted.
  376. .SS Uarts
  377. Plan 9 automatically configures COM1 and COM2, if found,
  378. as
  379. .B eia0
  380. (port 0x3F8, IRQ4)
  381. and
  382. .B eia1
  383. (port 0x2F8, IRQ3)
  384. respectively.
  385. These devices can be disabled by adding a line:
  386. .EX
  387. eia\fIX\fP=disabled
  388. .EE
  389. This is typically done in order to reuse the IRQ for
  390. another device.
  391. .PP
  392. Plan 9 used to support various serial concentrators,
  393. including the TTC 8 serial line card and various models
  394. in the Star Gate Avanstar series of intelligent serial boards.
  395. These are no longer supported; the much simpler
  396. Perle PCI-Fast4, PCI-Fast8, and PCI-Fast16 controllers
  397. have taken their places.
  398. These latter cards are automatically detected
  399. and need no configuration lines.
  400. .PP
  401. The line
  402. .B serial=type=com
  403. can be used to specify settings for a PCMCIA modem.
  404. .SS \fLmouseport=value\fP
  405. This specifies where the mouse is attached.
  406. .I Value
  407. can be
  408. .TP
  409. .B ps2
  410. the PS2 mouse/keyboard port. The BIOS setup procedure
  411. should be used to configure the machine appropriately.
  412. .TP
  413. .B ps2intellimouse
  414. an Intellimouse on the PS2 port.
  415. .TP
  416. .B 0
  417. for COM1
  418. .TP
  419. .B 1
  420. for COM2
  421. .SS \fLmodemport=value\fP
  422. Picks the UART line to call out on.
  423. This is used when connecting to a file server over
  424. an async line.
  425. .I Value
  426. is the number of the port.
  427. .SS \fLpccard0=disabled\fP
  428. Disable probing for and automatic configuration of PC card controllers.
  429. .SS \fLpcmciaX=type=XXX irq=value\fP
  430. If the default IRQ for the
  431. PCMCIA
  432. is correct, this entry can be omitted. The value of
  433. .B type
  434. is ignored.
  435. .SS \fLpcmcia0=disabled\fP
  436. Disable probing for and automatic configuration of PCMCIA controllers.
  437. .SS \fLconsole=value params\fP
  438. This is used to specify the console device.
  439. The default
  440. value is
  441. .BR cga ;
  442. a number
  443. .B 0
  444. or
  445. .B 1
  446. specifies
  447. .I COM1
  448. or
  449. .I COM2
  450. respectively.
  451. A serial console is initially configured with the
  452. .IR uart (3)
  453. configuration string
  454. .B b9600
  455. .B l8
  456. .B pn
  457. .BR s1 ,
  458. specifying 9600 baud,
  459. 8 bit bytes, no parity, and one stop bit.
  460. If
  461. .I params
  462. is given, it will be used to further
  463. configure the uart.
  464. Notice that there is no
  465. .B =
  466. sign in the
  467. .I params
  468. syntax.
  469. For example,
  470. .EX
  471. console=0 b19200 po
  472. .EE
  473. would use COM1 at 19,200 baud
  474. with odd parity.
  475. .SS \fLbootfile=value\fP
  476. This is used to direct the actions of
  477. .IR 9load (8)
  478. by naming the device and file from which to load the kernel.
  479. .SS \fLrootdir=dir\fP
  480. .SS \fLrootspec=spec\fP
  481. These are used by
  482. .IR 9load (8)
  483. to identify the directory
  484. .I dir
  485. to make the root directory for the kernel, and the
  486. file system specifier
  487. .I spec
  488. (see
  489. .B mount
  490. in
  491. .IR bind (2))
  492. on which it can be found.
  493. These are usually used to test variant file systems for distributions, etc.
  494. .SS \fLbootargs=value\fP
  495. The value of this variable is passed to
  496. .IR boot (8)
  497. by the kernel as the name of the root file system.
  498. It is typically used to specify additional arguments to
  499. pass to
  500. .IR kfs (4)
  501. or
  502. .IR ipconfig (8).
  503. For example, if the system is to run from a local
  504. .IR kfs (4)
  505. partition, the definition might read
  506. .BR bootargs=local!#S/sdC0/fs .
  507. See
  508. .IR boot (8)
  509. for more.
  510. .SS \fLventi=value\fP
  511. When booting from a local fossil server backed by a local
  512. or remote venti server,
  513. this variable specifies how to establish the connection to the
  514. venti server.
  515. See
  516. .IR boot (8)
  517. for more.
  518. .SS \fLcfs=value\fP
  519. This gives the name of the file holding the disk partition
  520. for the cache file system,
  521. .IR cfs (4).
  522. Extending the
  523. .B bootargs
  524. example, one would write
  525. .BR cfs=#S/sdC0/cache .
  526. .SS \fLbootdisk=value\fP
  527. This deprecated variable was used to specify the disk used by
  528. the cache file system and other disk-resident services.
  529. It is superseded by
  530. .B bootargs
  531. and
  532. .BR cfs .
  533. .SS \fLpartition=value\fP
  534. This defines the partition table
  535. .IR 9load (8)
  536. will examine to find disk partitioning information.
  537. By default, a partition table in a Plan 9 partition
  538. is consulted; if no such table is found, an old-Plan 9
  539. partition table on the next-to-last or last sector
  540. of the disk is consulted.
  541. A value of
  542. .B new
  543. consults only the first table,
  544. .B old
  545. only the second.
  546. .SS \fL*maxmem=value\fP
  547. This defines the maximum physical address that the system will scan when sizing memory.
  548. By default the operating system will scan up to 768 megabytes, but setting
  549. .B *maxmem
  550. will limit the scan.
  551. If the system has more than 768 megabytes, you must set
  552. .B *maxmem
  553. for the kernel to find it.
  554. .B *maxmem
  555. must be less than 1.75 gigabytes.
  556. .SS \fL*kernelpercent=value\fP
  557. This defines what percentage of available memory is reserved for the kernel allocation pool.
  558. The remainder is left for user processes. The default
  559. .I value
  560. is
  561. .B 30
  562. on CPU servers,
  563. .B 60
  564. on terminals with less than 16MB of memory,
  565. and
  566. .B 40
  567. on terminals with memories of 16MB or more.
  568. Terminals use more kernel memory because
  569. .IR draw (3)
  570. maintains its graphic images in kernel memory.
  571. This deprecated option is rarely necessary in newer kernels.
  572. .SS \fL*nomce=value\fP
  573. If machine check exceptions are supported by the processor,
  574. then they are enabled by default.
  575. Setting this variable to
  576. .B 1
  577. causes them to be disabled even when available.
  578. .SS \fL*nomp=\fP
  579. A multiprocessor machine will enable all processors by default.
  580. Setting
  581. .B *nomp
  582. restricts the kernel to starting only one processor and using the
  583. traditional interrupt controller.
  584. .SS \fL*ncpu=value\fP
  585. Setting
  586. .B *ncpu
  587. restricts the kernel to starting at most
  588. .I value
  589. processors.
  590. .SS \fL*pcimaxbno=value\fP
  591. This puts a limit on the maximum bus number probed
  592. on a PCI bus (default 255).
  593. For example, a
  594. .I value
  595. of 1 should suffice on a 'standard' motherboard with an AGP slot.
  596. This, and
  597. .B *pcimaxdno
  598. below are rarely used and only on troublesome or suspect hardware.
  599. .SS \fL*pcimaxdno=value\fP
  600. This puts a limit on the maximum device number probed
  601. on a PCI bus (default 31).
  602. .SS \fL*nopcirouting=\fP
  603. Disable pci routing during boot. May solve interrupt routing
  604. problems on certain machines.
  605. .SS \fL*nodumpstack=\fP
  606. Disable printing a stack dump on panic.
  607. Useful if there is only a limited cga screen available,
  608. otherwise the textual information about the panic may scroll off.
  609. .\" .SS \fL*nobios=\fP
  610. .\" what does this do? something with pci
  611. .SS \fLioexclude=value\fP
  612. Specifies a list of ranges I/O ports to exclude from use by drivers.
  613. Ranges are inclusive on both ends and separated by commas.
  614. For example:
  615. .EX
  616. ioexclude=0x330-0x337,0x430-0x43F
  617. .EE
  618. .SS \fLapm0=\fP
  619. This enables the ``advanced power management'' interface
  620. as described in
  621. .IR apm (3)
  622. and
  623. .IR apm (8).
  624. The main feature of the interface is the ability to watch
  625. battery life (see
  626. .IR stats (8)).
  627. It is not on by default because it causes problems on some laptops.
  628. .SS \fLmonitor=value\fP
  629. .SS \fLvgasize=value\fP
  630. These are used not by the kernel but by
  631. .I termrc
  632. (see
  633. .IR cpurc (8))
  634. when starting
  635. .IR vga (8).
  636. .SS \fL*dpms=value\fP
  637. This is used to specify the screen blanking behavior of the MGA4xx
  638. video driver.
  639. Values are
  640. .BR standby ,
  641. .BR suspend ,
  642. and
  643. .BR off .
  644. The first two specify differing levels of power saving;
  645. the third turns the monitor off completely.
  646. .SS \fLnvr=value\fP
  647. This is used by a file server kernel to locate a file holding information
  648. to configure the file system.
  649. The file cannot live on a SCSI disk.
  650. The default is
  651. .B fd!0!plan9.nvr
  652. (sic),
  653. unless
  654. .B bootfile
  655. is set, in which case it is
  656. .B plan9.nvr
  657. on the same disk as
  658. .BR bootfile .
  659. The syntax is either
  660. .BI fd! unit ! name
  661. or
  662. .BI hd! unit ! name
  663. where
  664. .I unit
  665. is the numeric unit id.
  666. This variant syntax is a vestige of the file server kernel's origins.
  667. .SS \fLaudioX=value\fP
  668. This defines a sound interface.
  669. .PP
  670. Known types are
  671. .TP
  672. .B sb16
  673. Sound Blaster 16.
  674. .TP
  675. .B ess1688
  676. A Sound Blaster clone.
  677. .PP
  678. The DMA channel may be any of 5, 6, or 7.
  679. The defaults are
  680. .EX
  681. port=0x220 irq=7 dma=5
  682. .EE
  683. .SS \fLfs=a.b.c.d\fP
  684. .SS \fLauth=a.b.c.d\fP
  685. These specify the IP address of the file and authentication server
  686. to use when mounting a network-provided root file system.
  687. They are used only if the addresses cannot be determined via DHCP.
  688. .SH Multiple Configurations
  689. .PP
  690. A
  691. .B plan9.ini
  692. file may contain multiple configurations,
  693. each within a block beginning with a line
  694. .EX
  695. [tag]
  696. .EE
  697. A special block with the tag
  698. .B menu
  699. gives a list of blocks from which the user may
  700. interactively select the contents of
  701. .BR plan9.ini .
  702. There may also be multiple blocks with the tag
  703. .B common
  704. which will be included in all selections;
  705. if any lines appear in
  706. .B plan9.ini
  707. before the first block,
  708. they are treated as a
  709. .B common
  710. block.
  711. .LP
  712. Within the
  713. .B menu
  714. block the following configuration lines are allowed:
  715. .SS \fLmenuitem=tag[, description]
  716. The block identified by
  717. .B tag
  718. will appear in the presented menu.
  719. The menu entry will consist of the
  720. .B tag
  721. unless the optional
  722. .B description
  723. is given.
  724. .SS \fLmenudefault=tag[, timeout]
  725. Identifies a default block to be given in the
  726. menu selection prompt.
  727. If the optional
  728. .B timeout
  729. is given (in seconds),
  730. the default block will be selected if there is no user
  731. input within the timeout period.
  732. .SS \fLmenuconsole=value[, baud]
  733. Selects a serial console upon which to present the menu
  734. as no
  735. .B console
  736. or
  737. .B baud
  738. configuration information will have been processed yet
  739. (the
  740. .B plan9.ini
  741. contents are still to be decided...).
  742. .LP
  743. In response to the menu being printed,
  744. the user is prompted to select a menu item from the list.
  745. If the numeric response is followed by a
  746. .BR p ,
  747. the selected configuration is printed and the menu presented
  748. again.
  749. .LP
  750. The line
  751. .EX
  752. menuitem=tag
  753. .EE
  754. is prefixed to the selected configuration as an aid to
  755. user-level initialization scripts.
  756. .SH EXAMPLES
  757. .PP
  758. A representative
  759. .BR plan9.ini :
  760. .IP
  761. .EX
  762. % cat /n/c:/plan9.ini
  763. ether0=type=3C509
  764. mouseport=ps2
  765. modemport=1
  766. serial0=type=generic port=0x3E8 irq=5
  767. monitor=445x
  768. vgasize=1600x1200x8
  769. %
  770. .EE
  771. .PP
  772. Minimum CONFIG.SYS and AUTOEXEC.BAT files to use
  773. COM2 as a console:
  774. .IP
  775. .EX
  776. % cat /n/c:/config.sys
  777. SHELL=COMMAND.COM COM2 /P
  778. % cat /n/c:/autoexec.bat
  779. @ECHO OFF
  780. PROMPT $p$g
  781. PATH C:\eDOS;C:\eBIN
  782. mode com2:96,n,8,1,p
  783. SET TEMP=C:\eTMP
  784. %
  785. .EE
  786. .PP
  787. Simple
  788. .B plan9.ini
  789. with multiple configurations:
  790. .IP
  791. .EX
  792. [menu]
  793. menuitem=vga, Plan 9 with VGA
  794. menuitem=novga, Plan 9 no automatic VGA
  795. menudefault=vga
  796. [vga]
  797. monitor=multisync135
  798. vgasize=1024x768x8
  799. [novga]
  800. [common]
  801. ether0=type=i82557
  802. audio0=type=sb16 port=0x220 irq=5 dma=1
  803. .EE
  804. .PP
  805. With this, the following menu will be presented on boot:
  806. .IP
  807. .EX
  808. Plan 9 Startup Menu:
  809. ====================
  810. 1. Plan 9 with VGA
  811. 2. Plan 9 no automatic VGA
  812. Selection[default==1]:
  813. .EE
  814. .PP
  815. Selecting item 1 generates the following
  816. .B plan9.ini
  817. to be used by the remainder of the bootstrap process:
  818. .IP
  819. .EX
  820. menuitem=vga
  821. monitor=multisync135
  822. vgasize=1024x768x8
  823. ether0=type=i82557
  824. audio0=type=sb16 port=0x220 irq=5 dma=1
  825. .EE
  826. .PP
  827. and selecting item 2:
  828. .IP
  829. .EX
  830. menuitem=novga
  831. ether0=type=i82557
  832. audio0=type=sb16 port=0x220 irq=5 dma=1
  833. .EE
  834. .SH "SEE ALSO"
  835. .IR 9load (8),
  836. .IR booting (8),
  837. .IR boot (8)
  838. .SH BUGS
  839. Being able to set the console device to other than a
  840. display is marginally useful on file servers; MS-DOS
  841. and the programs which run under it are so tightly bound
  842. to the display that it is necessary to have a display if any
  843. setup or reconfiguration programs need to be run.
  844. Also, the delay before any messages appear at boot time
  845. is disconcerting, as any error messages from the BIOS
  846. are lost.
  847. .PP
  848. This idea is at best an interesting experiment that needs another iteration.