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diff --git a/Documentation/scsi/scsi-generic.txt b/Documentation/scsi/scsi-generic.txt deleted file mode 100644 index 51be20a6a14d..000000000000 --- a/Documentation/scsi/scsi-generic.txt +++ /dev/null @@ -1,101 +0,0 @@ - Notes on Linux SCSI Generic (sg) driver - --------------------------------------- - 20020126 -Introduction -============ -The SCSI Generic driver (sg) is one of the four "high level" SCSI device -drivers along with sd, st and sr (disk, tape and CDROM respectively). Sg -is more generalized (but lower level) than its siblings and tends to be -used on SCSI devices that don't fit into the already serviced categories. -Thus sg is used for scanners, CD writers and reading audio CDs digitally -amongst other things. - -Rather than document the driver's interface here, version information -is provided plus pointers (i.e. URLs) where to find documentation -and examples. - - -Major versions of the sg driver -=============================== -There are three major versions of sg found in the linux kernel (lk): - - sg version 1 (original) from 1992 to early 1999 (lk 2.2.5) . - It is based in the sg_header interface structure. - - sg version 2 from lk 2.2.6 in the 2.2 series. It is based on - an extended version of the sg_header interface structure. - - sg version 3 found in the lk 2.4 series (and the lk 2.5 series). - It adds the sg_io_hdr interface structure. - - -Sg driver documentation -======================= -The most recent documentation of the sg driver is kept at the Linux -Documentation Project's (LDP) site: -http://www.tldp.org/HOWTO/SCSI-Generic-HOWTO -This describes the sg version 3 driver found in the lk 2.4 series. -The LDP renders documents in single and multiple page HTML, postscript -and pdf. This document can also be found at: -http://sg.danny.cz/sg/p/sg_v3_ho.html - -Documentation for the version 2 sg driver found in the lk 2.2 series can -be found at http://sg.danny.cz/sg/. A larger version -is at: http://sg.danny.cz/sg/p/scsi-generic_long.txt. - -The original documentation for the sg driver (prior to lk 2.2.6) can be -found at http://www.torque.net/sg/p/original/SCSI-Programming-HOWTO.txt -and in the LDP archives. - -A changelog with brief notes can be found in the -/usr/src/linux/include/scsi/sg.h file. Note that the glibc maintainers copy -and edit this file (removing its changelog for example) before placing it -in /usr/include/scsi/sg.h . Driver debugging information and other notes -can be found at the top of the /usr/src/linux/drivers/scsi/sg.c file. - -A more general description of the Linux SCSI subsystem of which sg is a -part can be found at http://www.tldp.org/HOWTO/SCSI-2.4-HOWTO . - - -Example code and utilities -========================== -There are two packages of sg utilities: - - sg3_utils for the sg version 3 driver found in lk 2.4 - - sg_utils for the sg version 2 (and original) driver found in lk 2.2 - and earlier -Both packages will work in the lk 2.4 series however sg3_utils offers more -capabilities. They can be found at: http://sg.danny.cz/sg/sg3_utils.html and -freecode.com - -Another approach is to look at the applications that use the sg driver. -These include cdrecord, cdparanoia, SANE and cdrdao. - - -Mapping of Linux kernel versions to sg driver versions -====================================================== -Here is a list of linux kernels in the 2.4 series that had new version -of the sg driver: - lk 2.4.0 : sg version 3.1.17 - lk 2.4.7 : sg version 3.1.19 - lk 2.4.10 : sg version 3.1.20 ** - lk 2.4.17 : sg version 3.1.22 - -** There were 3 changes to sg version 3.1.20 by third parties in the - next six linux kernel versions. - -For reference here is a list of linux kernels in the 2.2 series that had -new version of the sg driver: - lk 2.2.0 : original sg version [with no version number] - lk 2.2.6 : sg version 2.1.31 - lk 2.2.8 : sg version 2.1.32 - lk 2.2.10 : sg version 2.1.34 [SG_GET_VERSION_NUM ioctl first appeared] - lk 2.2.14 : sg version 2.1.36 - lk 2.2.16 : sg version 2.1.38 - lk 2.2.17 : sg version 2.1.39 - lk 2.2.20 : sg version 2.1.40 - -The lk 2.5 development series has recently commenced and it currently -contains sg version 3.5.23 which is functionally equivalent to sg -version 3.1.22 found in lk 2.4.17 . - - -Douglas Gilbert -26th January 2002 -dgilbert@interlog.com |