Annotation of sys/arch/zaurus/stand/zboot/boot.8, Revision 1.1.1.1
1.1 nbrk 1: .\" $OpenBSD: boot.8,v 1.8 2007/05/31 19:20:05 jmc Exp $
2: .\"
3: .\" Copyright (c) 1997-2001 Michael Shalayeff
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5: .\"
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28: .Dd $Mdocdate: May 31 2007 $
29: .Dt BOOT 8 zaurus
30: .Os
31: .Sh NAME
32: .Nm boot ,
33: .Nm boot.conf
34: .Nd
35: zaurus-specific second-stage bootstrap
36: .Sh DESCRIPTION
37: The main purpose of this program is to load the system kernel while dealing
38: with the peculiarities of the zaurus machine.
39: .Pp
40: As described in
41: .Xr boot_zaurus 8 ,
42: this program is loaded by the primary bootstrap loader and provides a
43: convenient way to load the kernel.
44: This program acts as an enhanced boot monitor for zaurus systems, providing
45: a common interface for the kernel to start from.
46: .Pp
47: Basic operations include:
48: .Pp
49: .Bl -bullet -compact
50: .It
51: Detecting and switching between multiple consoles.
52: .It
53: Loading kernels from any device supported by the primary bootstrap loader.
54: .\" .It
55: .\" Loading kernels compressed by
56: .\" .Xr gzip 1 .
57: .It
58: Passing system parameters queried from the primary bootstrap loader to the
59: kernel.
60: .It
61: Providing an interactive command line.
62: .El
63: .Pp
64: The sequence of its operation is as follows: initialization,
65: parsing the configuration file, then an interactive command line.
66: While at the command line you have 5 seconds to type any commands, if needed.
67: If time expires, the kernel will be loaded according to
68: the current variable settings (see the
69: .Nm set
70: command).
71: Each time a kernel load fails, the timeout is increased by one second.
72: The sequence of
73: .Nm
74: operations is as follows:
75: .Bl -enum
76: .It
77: Probe for console devices, which includes the (default) LCD+Keyboard
78: console
79: .Pq Li cn0
80: and up to three serial consoles
81: .Pf ( Li com0
82: through
83: .Li com2 )
84: connected to the serial ports.
85: Display messages to the default console about the devices found.
86: .\" .It
87: .\" Detect memory.
88: .\" Conventional memory is detected by querying the BIOS.
89: .\" Extended memory is detected by probing page-by-page through the address
90: .\" space, rather than asking the BIOS; many BIOS's cannot report larger than
91: .\" 64M of memory.
92: .\" All memory found is reported to the default console device.
93: .It
94: Probe for disk devices, and select the first disk with an i386-compatible
95: MBR and a valid
96: .Ox
97: primary partition.
98: .It
99: If the file
100: .Pa /etc/boot.conf
101: exists on the root filesystem on the selected disk, open and parse it.
102: This file may contain any commands
103: .Nm
104: accepts at the interactive prompt.
105: Though default settings usually suffice, they can be changed here.
106: .It
107: The header line
108: .Pp
109: .Dl >> OpenBSD/zaurus BOOT [x.xx]
110: .Pp
111: is displayed to the active console, where
112: .Ar x.xx
113: is the version number of the
114: .Nm
115: program, followed by the
116: .Pp
117: .Dl boot>
118: .Pp
119: prompt, which means you are in interactive mode and may enter commands.
120: If you do not,
121: .Nm
122: will proceed to load the kernel with the current parameters after the
123: timeout period has expired.
124: .El
125: .Pp
126: By default,
127: .Nm
128: attempts to load the kernel executable
129: .Pa /bsd .
130: If it fails to find the kernel and no alternative kernel image has
131: been specified, the system will be unable to boot.
132: .Sh COMMANDS
133: The following commands are accepted at the
134: .Nm
135: prompt:
136: .Bl -tag -width shorten
137: .It boot Op Ar image Op Fl acds
138: Boots the kernel image specified by
139: .Ar image
140: with any options given.
141: Image specification consists of a pair
142: .Ar device : Ns Ar filename ;
143: either or both can be omitted (`:' is not needed if both are omitted),
144: in which case values from
145: .Nm
146: variables will be used.
147: .Pp
148: When selecting the
149: .Ar device
150: to boot from,
151: .Nm
152: makes no distinction between SCSI and IDE type drives;
153: they are detected as
154: .Sq hd
155: devices.
156: Therefore, to boot kernel
157: .Pa /bsd
158: from slice
159: .Sq a
160: on the first hard drive
161: .Pq irrespective of device type ,
162: specify
163: .Dq boot hd0a:/bsd .
164: .Pp
165: .Em Note:
166: Normally, the internal hard disk is designated by the
167: .Ar device
168: name
169: .Sq hd0 .
170: If a CF hard disk is present in the socket when the system starts,
171: the internal hard disk is instead designated by the prefix
172: .Sq hd1 ,
173: and
174: .Sq hd0
175: will access the CF hard disk.
176: .Bl -tag -width _a_
177: .It Fl a
178: Causes the kernel to ask for the
179: .Nm root
180: device to use.
181: .It Fl c
182: Causes the kernel to go into
183: .Xr boot_config 8
184: before performing
185: .Xr autoconf 4
186: procedures.
187: .It Fl d
188: Causes the kernel to drop into
189: .Xr ddb 4
190: at the earliest convenient point.
191: .It Fl s
192: Causes the kernel to boot single-user.
193: .El
194: .It clear
195: Clears the console screen.
196: This is useful if your bootstrap console doesn't scroll the screen
197: automatically when the cursor is in the bottom line.
198: .It echo Op Ar args
199: Displays
200: .Ar args
201: on the console device.
202: .It help
203: Prints a list of available commands and machine dependent
204: commands, if any.
205: .It ls Op Ar directory
206: Prints contents of the specified
207: .Ar directory
208: in long format including: attributes and file type, owner, group,
209: size, filename.
210: .It reboot
211: .\" Reboots the machine by initiating a warm boot procedure.
212: Returns control to the primary bootstrap loader.
213: .It set Op Ar varname Op Ar value
214: If invoked without arguments, prints a list of variables and their values.
215: If only
216: .Ar varname
217: is specified, displays contents of that variable.
218: If
219: .Ar varname
220: and
221: .Ar value
222: are both specified, sets that variable to the given value.
223: Variables include:
224: .Pp
225: .Bl -tag -compact -width boothow
226: .It Nm addr
227: Address at which to load the kernel.
228: .It Nm debug
229: Debug flag if
230: .Nm
231: was compiled with DEBUG defined.
232: .It Nm device
233: Boot device name (e.g.,
234: .\" .Li fd0a ,
235: .Li hd0a ) .
236: .It Nm howto
237: Options to pass to the loaded kernel.
238: .It Nm image
239: File name containing the kernel image.
240: .It Nm timeout
241: Number of seconds boot will wait for human intervention before
242: booting the default kernel image.
243: .It Nm tty
244: Active console device name (e.g.,
245: .Li cn0 ,
246: .Li com0 ,
247: .Li com1 ) .
248: .El
249: .It stty Op Ar device Op Ar speed
250: Displays or sets the
251: .Ar speed
252: for a console
253: .Ar device .
254: If changing the baudrate for the currently active console,
255: .Nm
256: offers you five seconds of grace time before committing the change
257: to allow you to change your terminal's speed to match.
258: If changing speed
259: .Em not
260: for the active console, the baudrate is set for the
261: .Em next
262: time you switch to a serial console.
263: .Pp
264: The default baudrate is 9600bps.
265: .It time
266: Displays system time and date.
267: .El
268: .Sh UPDATING BOOTBLOCKS
269: Since the bootblocks actually live in a Linux flash filesystem, a
270: rather obtuse method must currently be used to upgrade them.
271: .Pp
272: .Bl -enum -offset indent -compact
273: .It
274: Place
275: .Pa zboot
276: and
277: .Pa zbsdmod.o
278: onto an MS-DOS filesystem on a CF card, and then insert into the Zaurus.
279: .It
280: Remove power from the Zaurus.
281: .It
282: Unplug the battery.
283: .It
284: Start holding down the
285: .Sq b
286: and
287: .Sq d
288: keys.
289: .It
290: Wait 30 seconds, then re-insert the battery and power up the Zaurus.
291: .It
292: When you see text start to appear on the Zaurus, release the
293: .Sq b
294: and
295: .Sq d
296: keys.
297: .It
298: Login as root and perform the following steps:
299: .Bd -literal -offset indent
300: # mount /dev/mtdblock2 /tmp
301: # cp /mnt/cf/z* /tmp/home/etc/rc.d
302: # reboot
303: .Ed
304: .Pp
305: An SD card with an MS-DOS filesystem may be used instead, in which case
306: the Linux pathname will be
307: .Pa /mnt/card
308: instead of
309: .Pa /mnt/cf .
310: .El
311: .Sh FILES
312: .Bl -tag -width /usr/mdec/zbsdmod.o -compact
313: .It Pa /usr/mdec/zbsdmod.o
314: kernel module for the primary bootstrap loader that must be
315: loaded before the system bootstrap
316: .It Pa /usr/mdec/zboot
317: system bootstrap
318: .It Pa /etc/boot.conf
319: system bootstrap's startup file
320: .It Pa /bsd
321: kernel image
322: .It Pa /bsd.rd
323: kernel image for installation/recovery
324: .El
325: .Sh EXAMPLES
326: Boot the default kernel:
327: .Pp
328: .Dl boot> boot
329: .Pp
330: Remove the 5 second pause at boot-time permanently, causing
331: .Nm
332: to load the kernel immediately without prompting:
333: .Pp
334: .Dl # echo \&"boot\&" > /etc/boot.conf
335: .Pp
336: Use serial console.
337: A null modem cable should connect the specified serial port to a terminal.
338: Useful for debugging.
339: .Pp
340: .Dl boot> set tty com0
341: .Pp
342: Invoke the serial console at every boot:
343: .Pp
344: .Dl # echo \&"set tty com0\&" > /etc/boot.conf
345: .Pp
346: Boot the kernel named
347: .Pa /bsd
348: from the second hard disk in
349: .Dq User Kernel Configuration
350: mode (see
351: .Xr boot_config 8 ) .
352: This mechanism allows for the explicit enabling and disabling of devices
353: during the current boot sequence, as well as the modification
354: of device parameters.
355: Once booted, such changes can be made permanent by using
356: .Xr config 8 Ns 's
357: .Fl e
358: option.
359: .Pp
360: .Dl boot> boot hd1a:/bsd -c
361: .Sh SEE ALSO
362: .\" .Xr gzip 1 ,
363: .Xr autoconf 4 ,
364: .Xr ddb 4 ,
365: .Xr boot_config 8 ,
366: .Xr boot_zaurus 8 ,
367: .Xr fdisk 8 ,
368: .\" .Xr installboot 8 ,
369: .Xr reboot 8
370: .\" .Pp
371: .\" RFC 1950 describes the zlib library interface.
372: .\" .Pp
373: .\" The official home page for the version of zlib used in this
374: .\" operating system is at http://www.gzip.org/zlib/.
375: .Sh HISTORY
376: This program was written by Michael Shalayeff for
377: .Ox 2.1 ,
378: and adapted to zaurus by Uwe Stuehler for
379: .Ox 3.7 .
380: .Sh BUGS
381: Non-IDE disks can not be used to load /etc/boot.conf or
382: the kernel from them.
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