![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to readme CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Net/2] / Net2 / scsi|
Return to readme CVS log | Up to [Net/2] / Net2 / scsi |
1.1 root 1: *
2: * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
3: * -------------------- ----- ----------------------
4: * CURRENT PATCH LEVEL: 1 00098
5: * -------------------- ----- ----------------------
6: *
7: * 16 Feb 93 Julian Elischer ADDED for SCSI system
8: This release consists of the following files
9: (relative to the base of the kernel tree)
10:
11:
12: MAKEDEV
13:
14: scsi
15: scsi/README
16: scsi/scsiconf.h
17: scsi/scsiconf.c
18: scsi/scsi_all.h
19:
20: scsi/scsi_disk.h
21: scsi/sd.c
22:
23: scsi/scsi_tape.h
24: scsi/st.c
25:
26: sys/chio.h
27: scsi/scsi_changer.h
28: scsi/ch.c
29:
30: sys/cdio.h
31: scsi/scsi_cd.h
32: scsi/cd.c
33:
34: i386/conf/SCSITEST
35: i386/isa/aha1542.c
36:
37: README.AHA1742
38: i386/conf/AHBTEST
39: i386/isa/aha1742.c
40:
41: i386/conf/UHATEST
42: i386/isa/ultra14f.c
43:
44: i386/conf/BTTEST
45: i386/isa/bt742a.c
46:
47:
48:
49: ----------------------------------------------------------------
50: This scsi system is designed to allow the re-use of top end drivers
51: such as disk and tape drivers, with different scsi adapters.
52:
53: As of writing this document, There are top end drivers working for:
54: ----------------------------------------------------------------
55: generic scsi disk
56: generic scsi tape
57: cd-rom (plays music under the xcplayer (?) program)
58: AEG Character recognition devices *
59: Calera Character recognition devices *
60: Kodak IL900 scanner *
61: Exabyte tape changer device.
62: ----------------------------------------------------------------
63:
64:
65: There are also working bottom end drivers for:
66: ----------------------------------------------------------------
67: adaptec 1542 (and 1742 in 1542 mode)
68: bustec 742a
69: adaptec 174x
70: Ultrastore 14f
71: ----------------------------------------------------------------
72:
73:
74: Work is proceeding on the following bottom end drivers:
75: ----------------------------------------------------------------
76: Future Domain (1680)** [email protected] & me
77: Future Domain (8 bit)**** [email protected]
78: WD7000** [email protected]
79: seagate st01/st02**** [email protected] ?
80: ----------------------------------------------------------------
81: * drivers not made public (proprietary.. proof that the concept works though)
82: ** driver not yet released but working.
83: *** just a dream so far.
84: **** some amount more than just a dream so far.
85:
86:
87: ################## Using the scsi system ##################
88: ------------minor numbers---------------
89: This scsi system does not allocate minor numbers to devices depending
90: on their SCSI IDs is any way. A devices minor number is dependant
91: on the order in which it was found.
92: e.g. the first tape found will become st0 (minor number 0)
93: the second found will become st1 (minor number 16)
94: the third will become st2 (minor 32)
95: etc.
96:
97: These devices could be on the same scsi bus or different scsi busses.
98: That would not change their minor numbers.
99:
100: It is possible to run two different TYPES of scsi adapters at the
101: same time and have st0 on one and st1 on another. (for example)
102:
103: There is a scheme supported in which scsi devices can be 'wired in' even
104: if they are not present or powered on at probe time. (see scsiconf.c)
105:
106: --------------getting started------------
107: It should be possible to use the /dev entries for as0 as if they were
108: /dev entries for sd0 and the old as bootblocks should
109: continue to work if you are using an adaptec 1542b.
110:
111: --------------making devices------------
112: A changed version of /dev/MAKEDEV is supplied that
113: can be used to make devices sd[01234] and st[01234]
114:
115: e.g.
116: cd /dev
117: sh MAKEDEV sd0 sd1 sd2 st0 st1 cd0
118:
119:
120: The tape devices are as follows:
121: rst0 basic raw device, will rewind on close
122: nrst0 will not rewind on close
123: erst0 will rewind and EJECTon close
124: nerst0 will not rewind and WILL eject (some devices may rewind anyhow)
125:
126: ------------future enhancements--------------
127: Some people have indicated that they would like to have the SCSI ID
128: encoded into the minor number in some way, and
129: this may be supported at some timein the future, using
130: minor numbers greater than 128. (or maybe a different major number)
131:
132: I will also be writing (probably) a generic scsi-error
133: handling routine that will be table driven, so that the routine can
134: be removed from each individual driver. With enough care,
135: two similar devices with different error codes (quite common) could run
136: the same driver but use different error tables.
137:
138: --------------file layout-------------------
139: Originally I had all scsi definitions in one file: scsi.h
140: I have since moved definitions of commands so that all
141: definitions needed for a particular type of device are
142: found together in the include file of that name.
143: This approximatly follows the layout of their definition
144: in the SCSI-2 spec.
145: As such they are:
146:
147: scsi_all.h general commands for all devices --- CHAPTER 7
148: scsi-disk.h commands relevant to disk --- CHAPTER 8
149: scsi-tape.h commands for scsi tapes --- CHAPTER 9
150: scsi-cd.h commands for cd-roms (and audio) --- CHAPTER 13
151: scsi-changer.h commands medium changer devices --- CHAPTER 16
152:
153: ---------ioctl definitions-------------
154: User accessable structures (e.g. ioctl definitions) have been
155: placed in sys/cdio and sys/chio (based after sys/mtio for
156: the ioctls for mag tapes (including st).
157:
158: -----------cd-rom-----------------
159: The cd rom driver ha been tested by a number of people and
160: [email protected] has completed the audio play
161: functions.
162: He tells me he has some Public Domain package that
163: allows an control of the cd player from an Xwindow
164: but I don't have it.
165:
166: -------------media changer---------------
167: Once again courtesy of [email protected].
168: I have not tested this but he assures me it's ready for testing.
169: If anyone has an exabyte tape changer or similar,
170: contact the author for information regarding the control interface
171: and program.
172:
173: -----------booting from an AHA-174x---------
174: For some reason I have not yet worked out,
175: the BIOS-based bootblocks I have posted will not boot
176: from the aha1742 in extended mode. (it can't be serious
177: because the MACH version works) This is in fact not a
178: problem because the aha1742 driver will force the board into extended
179: mode during probe, so it can be left in standard mode during the boot.
180: During the next reboot, the bios will place it back in standard mode
181: ready for the NEXT boot.
182:
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.