package/libertas/src/README

   1 ================================================================================
   2                         README for USB8388
   3
   4  (c) Copyright © 2003-2006, Marvell International Ltd.
   5  All Rights Reserved
   6
   7  This software file (the "File") is distributed by Marvell International
   8  Ltd. under the terms of the GNU General Public License Version 2, June 1991
   9  (the "License").  You may use, redistribute and/or modify this File in
  10  accordance with the terms and conditions of the License, a copy of which
  11  is available along with the File in the license.txt file or by writing to
  12  the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  13  02111-1307 or on the worldwide web at http://www.gnu.org/licenses/gpl.txt.
  14
  15  THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  16  IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  17  ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  18  this warranty disclaimer.
  19 ================================================================================
  20
  21 =====================
  22 DRIVER LOADING
  23 =====================
  24
  25         o. Copy the firmware image (e.g. usb8388.bin) to /lib/firmware/
  26
  27         o. Load driver by using the following command:
  28
  29                 insmod usb8388.ko [fw_name=usb8388.bin]
  30
  31 =====================
  32 IWPRIV COMMAND
  33 =====================
  34
  35 NAME
  36         This manual describes the usage of private commands used in Marvell WLAN
  37         Linux Driver. All the commands available in Wlanconfig will not be available
  38         in the iwpriv.
  39
  40 SYNOPSIS
  41         iwpriv <ethX> <command> [sub-command] ...
  42
  43         iwpriv ethX setregioncode <n>
  44         iwpriv ethX getregioncode
  45
  46 Version 5 Command:
  47         iwpriv ethX ledgpio <n>
  48
  49 BT Commands:
  50         The blinding table (BT) contains a list of mac addresses that will be,
  51         by default, ignored by the firmware. It is also possible to invert this
  52         behavior so that we will ignore all traffic except for the portion
  53         coming from mac addresess in the list. It is primarily used for
  54         debugging and testing networks.  It can be edited and inspected with
  55         the following commands:
  56
  57         iwpriv ethX bt_reset
  58         iwpriv ethX bt_add <mac_address>
  59         iwpriv ethX bt_del <mac_address>
  60         iwpriv ethX bt_list <id>
  61         iwpriv ethX bt_get_invert <n>
  62         iwpriv ethX bt_set_invert <n>
  63
  64 FWT Commands:
  65         The forwarding table (FWT) is a feature used to manage mesh network
  66         routing in the firmware.  The FWT is essentially a routing table that
  67         associates a destination mac address (da) with a next hop receiver
  68         address (ra).  The FWT can be inspected and edited with the following
  69         iwpriv commands, which are described in greater detail below.
  70         Eventually, the table will be automatically maintained by a custom
  71         routing protocol.
  72
  73         NOTE: FWT commands replace the previous DFT commands.  What were the DFT
  74         commands?, you might ask.  They were an earlier API to the firmware that
  75         implemented a simple MAC-layer forwarding mechanism.  In the unlikely
  76         event that you were using these commands, you must migrate to the new
  77         FWT commands which can be used to achieve the same functionality.
  78
  79         iwpriv ethX fwt_add [parameters]
  80         iwpriv ethX fwt_del [parameters]
  81         iwpriv ethX fwt_lookup [parameters]
  82         iwpriv ethX fwt_list [parameters]
  83         iwpriv ethX fwt_list_route [parameters]
  84         iwpriv ethX fwt_list_neigh [parameters]
  85         iwpriv ethX fwt_reset [parameters]
  86         iwpriv ethX fwt_cleanup
  87         iwpriv ethX fwt_time
  88
  89 MESH Commands:
  90
  91         The MESH commands are used to configure various features of the mesh
  92         routing protocol.  The following commands are supported:
  93
  94         iwpriv ethX mesh_get_ttl
  95         iwpriv ethX mesh_set_ttl ttl
  96         iwpriv ethX mesh_get_bcastr rate
  97         iwpriv ethX mesh_set_bcastr rate
  98         iwpriv ethX get_rreq_delay
  99         iwpriv ethX set_rreq_delay delay
 100         iwpriv ethX get_route_exp
 101         iwpriv ethX set_route_exp time
 102         iwpriv ethX get_link_costs
 103         iwpriv ethX set_link_costs "cost54 cost36 cost11 cost1"
 104
 105 DESCRIPTION
 106         Those commands are used to send additional commands to the Marvell WLAN
 107         card via the Linux device driver.
 108
 109         The ethX parameter specifies the network device that is to be used to
 110                 perform this command on. it could be eth0, eth1 etc.
 111
 112 setregioncode
 113         This command is used to set the region code in the station.
 114         where value is 'region code' for various regions like
 115         USA FCC, Canada IC, Spain, France, Europe ETSI, Japan ...
 116
 117         Usage:
 118                 iwpriv ethX setregioncode 0x10: set region code to USA (0x10).
 119
 120 getregioncode
 121         This command is used to get the region code information set in the
 122         station.
 123
 124 ledgpio
 125         This command is used to set/get LEDs.
 126
 127         iwpriv ethX ledgpio <LEDs>
 128                 will set the corresponding LED for the GPIO Line.
 129
 130         iwpriv ethX ledgpio
 131                 will give u which LEDs are Enabled.
 132
 133         Usage:
 134                 iwpriv eth1 ledgpio 1 0 2 1 3 4
 135                         will enable
 136                         LED 1 -> GPIO 0
 137                         LED 2 -> GPIO 1
 138                         LED 3 -> GPIO 4
 139
 140                 iwpriv eth1 ledgpio
 141                         shows LED information in the format as mentioned above.
 142
 143         Note: LED0 is invalid
 144         Note: Maximum Number of LEDs are 16.
 145
 146 bcn_control
 147         This command is used to enable disable beacons. This can also be used
 148         to set beacon interval.
 149
 150         Usage:
 151                 iwpriv ethX bcn_control [enable] [beacon_interval]
 152
 153                 enable: 0 to disable beacon. 1 to enable beacon.
 154                 beacon_interval: 20 - 1000ms.
 155
 156         Examples:
 157                 1. iwpriv ethX bcn_control
 158                    Returns (x, y), where x if 1, indicates beacon is enabled, y
 159                    beacon period.
 160                 2. iwpriv ethX bcn_control 0
 161                    Turns off beacon transmission.
 162                 3. iwpriv ethX bcn_control 1 500
 163                    Enable beacon with beacon interval 500ms.
 164
 165
 166 ledbhv
 167       Command iwpriv mshX ledbhv can be used to change default LEDs behaviors.
 168       A given LED behavior can be on, off or blinking. The duty/cycle can be set
 169       when behavior is programmed as blinking.
 170
 171       Usage:
 172
 173         1. To get default LED behavior
 174            iwpriv mshX ledbhv <firmware state>
 175
 176         2. To set or change default LED behavior
 177            iwpriv mshX ledbhv <firmware state> <lednum> <behavior> <arg>
 178
 179         firmware state: The following are some of the relevant states.
 180           00: disconnected
 181           01: firmware is scanning
 182           02: firmware is connected and awake
 183           03: firmware is sleeping
 184           04: connected deep sleep
 185           06: firmware disconnected link lost
 186           07: firmware disconnected disassociated
 187           09: data transfer while firmware is associated and not scanning.
 188               If firmware is already in this state, LED behavior does not change
 189               on this data transfer.
 190           10: firmware idle, not scanning, not disconnected or disassociated.
 191
 192         lednum: 1 or 2 for first and second LED.
 193
 194         behavior: 0 for steady ON, 1 - steady off and 2- blinking.
 195
 196         arg: It is used when behavior is 2 to set duty and cycle. It is defined as
 197              (duty << 4 | cycle). Here duty could be 0..4 and cycle 0..5 for 34,
 198              74, 149, 298, 596, 1192 ms respectively.
 199
 200       Examples:
 201
 202        1. To get default behavior for scan
 203           iwpriv mshX ledbhv 1
 204
 205        2. To get default behavior while data transfer
 206           iwpriv mshX ledbhv 9
 207
 208        3. To turn off LED 2
 209           iwpriv mshX ledbhv 2 2 1 0
 210           iwpriv mshX ledbhv 10 2 1 0
 211
 212        4. To enable LED 2 and blink LED 1 while data transfer.
 213           iwpriv mshX ledbhv 9 2 0 0
 214           iwpriv mshX ledbhv 9 1 2 4
 215
 216        5. To change duty cycle of LED 2 during data transfer
 217           iwpriv mshX ledbhv 9 2 2 36
 218
 219        6. To turn ON LED 2 when firmware is disassociated/disconnected.
 220           iwpriv mshX ledbhv 0 2 0 0
 221
 222
 223 fwt_add
 224         This command is used to insert an entry into the FWT table. The list of
 225         parameters must follow the following structure:
 226
 227         iwpriv ethX fwt_add da ra [metric dir rate ssn dsn hopcount ttl expiration sleepmode snr]
 228
 229         The parameters between brackets are optional, but they must appear in
 230         the order specified.  For example, if you want to specify the metric,
 231         you must also specify the dir, ssn, and dsn but you need not specify the
 232         hopcount, expiration, sleepmode, or snr.  Any unspecified parameters
 233         will be assigned the defaults specified below.
 234
 235         The different parameters are:-
 236                 da              -- DA MAC address in the form 00:11:22:33:44:55
 237                 ra              -- RA MAC address in the form 00:11:22:33:44:55
 238                 metric          -- route metric (cost: smaller-metric routes are
 239                                    preferred, default is 0)
 240                 dir             -- direction (1 for direct, 0 for reverse,
 241                                    default is 1)
 242                 rate            -- data rate used for transmission to the RA,
 243                                    as specified for the rateadapt command,
 244                                    default is 3 (11Mbps)
 245                 ssn             -- Source Sequence Number (time at the RA for
 246                                    reverse routes.  Default is 0)
 247                 dsn             -- Destination Sequence Number (time at the DA
 248                                    for direct routes.  Default is 0)
 249                 hopcount        -- hop count (currently unused, default is 0)
 250                 ttl             -- TTL (Only used in reverse entries)
 251                 expiration      -- entry expiration (in ticks, where a tick is
 252                                    1024us, or ~ 1ms. Use 0 for an indefinite
 253                                    entry, default is 0)
 254                 sleepmode       -- RA's sleep mode (currently unused, default is
 255                                    0)
 256                 snr             -- SNR in the link to RA (currently unused,
 257                                    default is 0)
 258
 259         The command does not return anything.
 260
 261 fwt_del
 262         This command is used to remove an entry to the FWT table. The list of
 263         parameters must follow the following structure:
 264
 265                 iwpriv ethX fwt_del da ra [dir]
 266
 267         where the different parameters are:-
 268                 da              -- DA MAC address (in the form "00:11:22:33:44:55")
 269                 ra              -- RA MAC address (in the form "00:11:22:33:44:55")
 270                 dir             -- direction (1 for direct, 0 for reverse,
 271                                    default is 1)
 272
 273         The command does not return anything.
 274
 275 fwt_lookup
 276         This command is used to get the best route in the FWT table to a given
 277         host. The only parameter is the MAC address of the host that is being
 278         looked for.
 279
 280                 iwpriv ethX fwt_lookup da
 281
 282         where:-
 283                 da              -- DA MAC address (in the form "00:11:22:33:44:55")
 284
 285         The command returns an output string identical to the one returned by
 286         fwt_list described below.
 287
 288
 289 fwt_list
 290         This command is used to list a route from the FWT table. The only
 291         parameter is the index into the table. If you want to list all the
 292         routes in a table, start with index=0, and keep listing until you get a
 293         "(null)" string.  Note that the indicies may change as the fwt is
 294         updated.  It is expected that most users will not use fwt_list directly,
 295         but that a utility similar to the traditional route command will be used
 296         to invoke fwt_list over and over.
 297
 298                 iwpriv ethX fwt_list index
 299
 300         The output is a string of the following form:
 301
 302                 da ra valid metric dir rate ssn dsn hopcount ttl expiration
 303                 sleepmode snr precursor
 304
 305         where the different fields are:-
 306                 da              -- DA MAC address (in the form "00:11:22:33:44:55")
 307                 ra              -- RA MAC address (in the form "00:11:22:33:44:55")
 308                 valid           -- whether the route is valid (0 if not valid)
 309                 metric          -- route metric (cost: smaller-metric routes are preferred)
 310                 dir             -- direction (1 for direct, 0 for reverse)
 311                 rate            -- data rate used for transmission to the RA,
 312                                    as specified for the rateadapt command
 313                 ssn             -- Source Sequence Number (time at the RA for reverse routes)
 314                 dsn             -- Destination Sequence Number (time at the DA for direct routes)
 315                 hopcount        -- hop count (currently unused)
 316                 ttl             -- TTL (only used in reverse entries)
 317                 expiration      -- entry expiration (in ticks, where a tick is 1024us, or ~ 1ms. Use 0 for an indefinite entry)
 318                 sleepmode       -- RA's sleep mode (currently unused)
 319                 snr             -- SNR in the link to RA (currently unused)
 320                 precursor       -- predecessor in direct routes
 321
 322 fwt_list_route
 323         This command is equivalent to fwt_list.
 324
 325 fwt_list_neigh
 326         This command is used to list a neighbor from the FWT table. The only
 327         parameter is the neighbor ID. If you want to list all the neighbors in a
 328         table, start with nid=0, and keep incrementing nid until you get a
 329         "(null)" string.  Note that the nid from a fwt_list_route command can be
 330         used as an input to this command.  Also note that this command is meant
 331         mostly for debugging.  It is expected that users will use fwt_lookup.
 332         One important reason for this is that the neighbor id may change as the
 333         neighbor table is altered.
 334
 335                 iwpriv ethX fwt_list_neigh nid
 336
 337         The output is a string of the following form:
 338
 339                 ra sleepmode snr references
 340
 341         where the different fields are:-
 342                 ra              -- RA MAC address (in the form "00:11:22:33:44:55")
 343                 sleepmode       -- RA's sleep mode (currently unused)
 344                 snr             -- SNR in the link to RA (currently unused)
 345                 references      -- RA's reference counter
 346
 347 fwt_reset
 348         This command is used to reset the FWT table, getting rid of all the
 349         entries. There are no input parameters.
 350
 351                 iwpriv ethX fwt_reset
 352
 353         The command does not return anything.
 354
 355 fwt_cleanup
 356         This command is used to perform user-based garbage recollection. The
 357         FWT table is checked, and all the entries that are expired or invalid
 358         are cleaned. Note that this is exported to the driver for debugging
 359         purposes, as garbage collection is also fired by the firmware when in
 360         space problems. There are no input parameters.
 361
 362                 iwpriv ethX fwt_cleanup
 363
 364         The command does returns the number of invalid/expired routes deleted.
 365
 366 fwt_time
 367         This command returns a card's internal time representation.  It is this
 368         time that is used to represent the expiration times of FWT entries.  The
 369         number is not consistent from card to card; it is simply a timer count.
 370         The fwt_time command is used to inspect the timer so that expiration
 371         times reported by fwt_list can be properly interpreted.
 372
 373                 iwpriv ethX fwt_time
 374
 375 mesh_get_ttl
 376
 377         The mesh ttl is the number of hops a mesh packet can traverse before it
 378         is dropped.  This parameter is used to prevent infinite loops in the
 379         mesh network.  The value returned by this function is the ttl assigned
 380         to all mesh packets.  Currently there is no way to control the ttl on a
 381         per packet or per socket basis.
 382
 383         iwpriv ethX mesh_get_ttl
 384
 385 mesh_set_ttl ttl
 386
 387         Set the ttl.  The argument must be between 0 and 255.
 388
 389         iwpriv ethX mesh_set_ttl <ttl>
 390
 391 mesh_get_bcastr
 392
 393         Shows the rate index used for mesh broadcast and multicast packets.
 394         Rates are expressed in 2 * Mb/s, ie 11Mb/s is 22, 5.5Mb/s is 11, etc.
 395
 396         iwpriv ethX mesh_get_bcastr rate
 397
 398 mesh_set_bcastr rate
 399
 400         Sets the rate index for mesh broadcast and muticast packets. Rates are
 401         expressed in expressed in 2 * Mb/s, ie 11Mb/s is 22, 5.5Mb/s is 11, etc.
 402
 403         iwpriv ethX mesh_set_bcastr rate
 404
 405 get_rreq_delay
 406
 407         Shows the delay to forward a RREQ frame. This delay allows the node to
 408         forward just the best route in case the same RREQ arrives to the node
 409         through different routes. The argument is shown in 1/100 seconds.
 410
 411         iwpriv ethX get_rreq_delay
 412
 413 set_rreq_delay delay
 414
 415         Sets the RREQ forward delay. The delay is interpreted as 1/100 seconds.
 416
 417         iwpriv ethX set_rreq_delay delay
 418
 419 get_route_exp
 420
 421         Shows the mesh route expiration time, in seconds.
 422
 423         iwpriv ethX get_route_exp
 424
 425 set_route_exp time
 426
 427         Gets the mesh route, expiration time, in seconds.
 428
 429         iwpriv ethX set_route_exp time
 430
 431 get_link_costs
 432
 433         Gets the mesh hop base cost for each used rate. The output gives us the
 434         base cost for hops at 54Mbps, 36Mbps, 11Mbps and 1Mbps, in that order.
 435         The base cost gets divided by a battery state factor to get the actual
 436         cost. A cost of 0 means that rate is deactivated.
 437
 438         iwpriv ethX get_link_costs
 439
 440 set_link_costs "cost54 cost36 cost11 cost1"
 441
 442         Sets the mesh hop base cost for the used speeds. The input parameter
 443         will specify the cost for hops at 54Mbps, 36Mbps, 11Mbps and 1Mbps, in
 444         that order. A cost of 0 will disable a specific rate.
 445
 446         iwpriv ethX set_link_costs "cost54 cost36 cost11 cost1"
 447
 448 =========================
 449 ETHTOOL
 450 =========================
 451
 452
 453 Use the -i option to retrieve version information from the driver.
 454
 455 # ethtool -i eth0
 456 driver: libertas
 457 version: COMM-USB8388-318.p4
 458 firmware-version: 5.110.7
 459 bus-info:
 460
 461 Use the -e option to read the EEPROM contents of the card.
 462
 463         Usage:
 464         ethtool -e ethX [raw on|off] [offset N] [length N]
 465
 466        -e     retrieves and prints an EEPROM dump for the  specified  ethernet
 467               device.   When raw is enabled, then it dumps the raw EEPROM data
 468               to stdout. The length and offset parameters allow  dumping  cer-
 469               tain portions of the EEPROM.  Default is to dump the entire EEP-
 470               ROM.
 471
 472 # ethtool -e eth0 offset 0 length 16
 473 Offset          Values
 474 ------          ------
 475 0x0000          38 33 30 58 00 00 34 f4 00 00 10 00 00 c4 17 00
 476
 477 ========================
 478 DEBUGFS COMMANDS
 479 ========================
 480
 481 those commands are used via debugfs interface
 482
 483 ===========
 484 rdmac
 485 rdbbp
 486 rdrf
 487         These commands are used to read the MAC, BBP and RF registers from the
 488         card.  These commands take one parameter that specifies the offset
 489         location that is to be read.  This parameter must be specified in
 490         hexadecimal (its possible to preceed preceding the number with a "0x").
 491
 492         Path: /debugfs/libertas_wireless/ethX/registers/
 493
 494         Usage:
 495                 echo "0xa123" > rdmac ; cat rdmac
 496                 echo "0xa123" > rdbbp ; cat rdbbp
 497                 echo "0xa123" > rdrf ; cat rdrf
 498 wrmac
 499 wrbbp
 500 wrrf
 501         These commands are used to write the MAC, BBP and RF registers in the
 502         card.  These commands take two parameters that specify the offset
 503         location and the value that is to be written. This parameters must
 504         be specified in hexadecimal (its possible to preceed the number
 505         with a "0x").
 506
 507         Usage:
 508                 echo "0xa123 0xaa" > wrmac
 509                 echo "0xa123 0xaa" > wrbbp
 510                 echo "0xa123 0xaa" > wrrf
 511
 512 sleepparams
 513         This command is used to set the sleepclock configurations
 514
 515         Path: /debugfs/libertas_wireless/ethX/
 516
 517         Usage:
 518                 cat sleepparams: reads the current sleepclock configuration
 519
 520                 echo "p1 p2 p3 p4 p5 p6" > sleepparams: writes the sleepclock configuration.
 521
 522                 where:
 523                         p1 is Sleep clock error in ppm (0-65535)
 524                         p2 is Wakeup offset in usec (0-65535)
 525                         p3 is Clock stabilization time in usec (0-65535)
 526                         p4 is Control periodic calibration (0-2)
 527                         p5 is Control the use of external sleep clock (0-2)
 528                         p6 is reserved for debug (0-65535)
 529
 530 subscribed_events
 531
 532         The subscribed_events directory contains the interface for the
 533         subscribed events API.
 534
 535         Path: /debugfs/libertas_wireless/ethX/subscribed_events/
 536
 537         Each event is represented by a filename. Each filename consists of the
 538         following three fields:
 539         Value Frequency Subscribed
 540
 541         To read the current values for a given event, do:
 542                 cat event
 543         To set the current values, do:
 544                 echo "60 2 1" > event
 545
 546         Frequency field specifies the reporting frequency for this event.
 547         If it is set to 0, then the event is reported only once, and then
 548         automatically unsubscribed. If it is set to 1, then the event is
 549         reported every time it occurs. If it is set to N, then the event is
 550         reported every Nth time it occurs.
 551
 552         beacon_missed
 553         Value field specifies the number of consecutive missing beacons which
 554         triggers the LINK_LOSS event. This event is generated only once after
 555         which the firmware resets its state. At initialization, the LINK_LOSS
 556         event is subscribed by default. The default value of MissedBeacons is
 557         60.
 558
 559         failure_count
 560         Value field specifies the consecutive failure count threshold which
 561         triggers the generation of the MAX_FAIL event. Once this event is
 562         generated, the consecutive failure count is reset to 0.
 563         At initialization, the MAX_FAIL event is NOT subscribed by
 564         default.
 565
 566         high_rssi
 567         This event is generated when the average received RSSI in beacons goes
 568         above a threshold, specified by Value.
 569
 570         low_rssi
 571         This event is generated when the average received RSSI in beacons goes
 572         below a threshold, specified by Value.
 573
 574         high_snr
 575         This event is generated when the average received SNR in beacons goes
 576         above a threshold, specified by Value.
 577
 578         low_snr
 579         This event is generated when the average received SNR in beacons goes
 580         below a threshold, specified by Value.
 581
 582 extscan
 583         This command is used to do a specific scan.
 584
 585         Path: /debugfs/libertas_wireless/ethX/
 586
 587         Usage: echo "SSID" > extscan
 588
 589         Example:
 590                 echo "LINKSYS-AP" > extscan
 591
 592         To see the results of use getscantable command.
 593
 594 getscantable
 595
 596         Display the current contents of the driver scan table (ie. get the
 597         scan results).
 598
 599         Path: /debugfs/libertas_wireless/ethX/
 600
 601         Usage:
 602                 cat getscantable
 603
 604 setuserscan
 605         Initiate a customized scan and retrieve the results
 606
 607
 608         Path: /debugfs/libertas_wireless/ethX/
 609
 610     Usage:
 611        echo "[ARGS]" > setuserscan
 612
 613          where [ARGS]:
 614
 615       bssid=xx:xx:xx:xx:xx:xx  specify a BSSID filter for the scan
 616       ssid="[SSID]"            specify a SSID filter for the scan
 617       keep=[0 or 1]            keep the previous scan results (1), discard (0)
 618       dur=[scan time]          time to scan for each channel in milliseconds
 619       type=[1,2,3]             BSS type: 1 (Infra), 2(Adhoc), 3(Any)
 620
 621     Any combination of the above arguments can be supplied on the command
 622     line. If dur tokens are absent, the driver default setting will be used.
 623     The bssid and ssid fields, if blank, will produce an unfiltered scan.
 624     The type field will default to 3 (Any) and the keep field will default
 625     to 0 (Discard).
 626
 627     Examples:
 628     1) Perform a passive scan on all channels for 20 ms per channel:
 629             echo "dur=20" > setuserscan
 630
 631     2) Perform an active scan for a specific SSID:
 632             echo "ssid="TestAP"" > setuserscan
 633
 634     3) Scan all available channels (B/G, A bands) for a specific BSSID, keep
 635        the current scan table intact, update existing or append new scan data:
 636             echo "bssid=00:50:43:20:12:82 keep=1" > setuserscan
 637
 638     4) Scan for all infrastructure networks.
 639        Keep the previous scan table intact. Update any duplicate BSSID/SSID
 640        matches with the new scan data:
 641             echo "type=1 keep=1" > setuserscan
 642
 643     All entries in the scan table (not just the new scan data when keep=1)
 644     will be displayed upon completion by use of the getscantable ioctl.
 645
 646 ==============================================================================