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1.1 root 1:
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3: aha154x Device Driver aha154x
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8: Adaptec AHA-154x device driver
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11: The device driver aahhaa115544xx lets you use SCSI interface devices
12: attached to an Adaptec AHA-154x series host adapter. This driver
13: has major number 13. It can be accessed either as a block-
14: special device or as a character-special device. The minor
15: number specifies the device and partition number for disk-type
16: devices, letting you use up to eight SCSI-IDs, with up to four
17: logical unit numbers (LUNs) per SCSI-ID and up to four partitions
18: per LUN.
19:
20: The first ooppeenn call on a SCSI disk device allocates memory for
21: the partition table and reads it into memory.
22:
23: ***** Controller Configuration *****
24:
25: Prior to installing the Adaptec host adapter in your system, you
26: must configure the I/O base address, interrupt vector and DMA
27: channel as follows:
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29:
30: I/O base address:0x330
31: DMA channel: 5
32: Interrupt vector:IRQ11
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35: In addition, if you are using any synchronous SCSI peripherals,
36: disable the synchronous transfer option on the Adaptec host
37: adapter.
38:
39: After verifying that your controller works with COHERENT, you may
40: select an alternate I/O base address or an alternate interrupt
41: vector. Device driver variables SSDDBBAASSEE_ and SSDDIIRRQQ_ correspond to
42: the I/O base address and interrupt vector, respectively. See
43: Lexicon article hhss for an example of how to configure a device
44: driver.
45:
46: When processing BIOS I/O requests prior to booting COHERENT, the
47: Adaptec host adapter uses ``translation mode'' drive parameters:
48: number of heads, cylinders, and sectors per track. Most current
49: versions of the AHA-154x use values of 64 heads and 32 sectors
50: per track, and calculate the number of cylinders based upon drive
51: capacity. Note that these numbers are called translation-mode
52: parameters because they have nothing to do with the physical
53: drive geometry. Some early versions of the AHA-154x, and some
54: versions distributed by Tandy, use 16 heads and 32 sectors per
55: track. Device driver variable SSDD_HHDDSS_ is initialized to 64 as
56: shipped; it should be patched to a value of 16 for adapters
57: whose BIOS code uses 16-head translation mode. The translation-
58: mode parameters used by the BIOS code present on your host
59: adapter can be obtained using the ddppbb utility found on the boot
60: diskette of versions 3.2.0 and later of COHERENT. Note that the
61: BIOS code is executed by COHERENT only during initial bootstrap.
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64: COHERENT Lexicon Page 1
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69: aha154x Device Driver aha154x
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73: After that, drive parameters are of no consequence since SCSI I/O
74: requests are based upon logical block number, rather than on
75: cylinder/head/sector addressing.
76:
77: The installation procedure for COHERENT versions 3.2.0 and later
78: patches all necessary variables for the accompanying version of
79: the aahhaa115544xx driver by executing the command:
80:
81:
82: /etc/mkdev scsi
83:
84:
85: ***** Minor Device Numbers *****
86:
87: The minor device number is decoded as follows:
88:
89:
90: _B_i_t _n_u_m_b_e_r: 7 6 5 4 3 2 1 0
91: _M_e_a_n_i_n_g: S I I I L L P P
92:
93:
94: where _S indicates the ``special'' bit, _I_I_I indicates a three-bit
95: field containing the SCSI-ID in the range of zero through seven,
96: _L_L indicates a two-bit field containing a LUN in the range of
97: zero through three, and _P_P indicates a two-bit field that
98: contains either a partition number for disk-type devices or a set
99: of special modes for devices other than disks.
100:
101: The ``special'' bit and the partition number interact as follows:
102:
103:
104: _D_e_s_c_r_i_p_t_i_o_n _S _B_i_t _P_P _D_e_v_i_c_e _T_y_p_e
105: partition a 0 00 /dev/sd?a disk
106: partition b 0 01 /dev/sd?b disk
107: partition c 0 10 /dev/sd?c disk
108: partition d 0 11 /dev/sd?d disk
109: partition table 1 00 /dev/sd?x disk
110: no rewind 1 01 /dev/sd?n tape
111: RESERVED 1 10 --- ----
112: rewind on close 1 11 /dev/sd? tape
113:
114:
115: ***** Loading the Driver ***** The aahhaa115544xx loadable device driver
116: must be loaded on a system that does not have a SCSI hard disk as
117: the root device. To do so, use the command /eettcc/ddrrvvlldd, as
118: follows:
119:
120:
121: /etc/drvld -r /drv/aha154x
122:
123:
124: ***** Files ***** /ddeevv/ssdd* -- bblloocckk-ssppeecciiaall ddeevviicceess
125: /ddeevv/rrssdd* -- cchhaarraacctteerr-ssppeecciiaall ddeevviicceess
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129:
130: COHERENT Lexicon Page 2
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135: aha154x Device Driver aha154x
136:
137:
138:
139: ***** See Also *****
140:
141: ddeevviiccee ddrriivveerrss, ddrrvvlldd, ssccssii
142:
143: ***** Notes *****
144:
145: This release of the aahhaa115544xx device driver only supports disk-type
146: devices. A future version of the driver will add support for
147: tape-type and other devices.
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196: COHERENT Lexicon Page 3
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