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Below you will find an updated version from the original series bunching all patches into one big patch updating broken web addresses that are located in Documentation/* Some of the addresses date as far far back as 1995 etc... so searching became a bit difficult, the best way to deal with these is to use web.archive.org to locate these addresses that are outdated. Now there are also some addresses pointing to .spec files some are located, but some(after searching on the companies site)where still no where to be found. In this case I just changed the address to the company site this way the users can contact the company and they can locate them for the users. Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Thomas Weber <weber@corscience.de> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Cc: Paulo Marques <pmarques@grupopie.com> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Michael Neuling <mikey@neuling.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
45 lines
2.2 KiB
Plaintext
45 lines
2.2 KiB
Plaintext
SCSI subsystem documentation
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============================
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The Linux Documentation Project (LDP) maintains a document describing
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the SCSI subsystem in the Linux kernel (lk) 2.4 series. See:
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http://www.tldp.org/HOWTO/SCSI-2.4-HOWTO . The LDP has single
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and multiple page HTML renderings as well as postscript and pdf.
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It can also be found at:
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http://web.archive.org/web/*/http://www.torque.net/scsi/SCSI-2.4-HOWTO
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Notes on using modules in the SCSI subsystem
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============================================
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The scsi support in the linux kernel can be modularized in a number of
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different ways depending upon the needs of the end user. To understand
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your options, we should first define a few terms.
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The scsi-core (also known as the "mid level") contains the core of scsi
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support. Without it you can do nothing with any of the other scsi drivers.
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The scsi core support can be a module (scsi_mod.o), or it can be built into
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the kernel. If the core is a module, it must be the first scsi module
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loaded, and if you unload the modules, it will have to be the last one
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unloaded. In practice the modprobe and rmmod commands (and "autoclean")
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will enforce the correct ordering of loading and unloading modules in
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the SCSI subsystem.
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The individual upper and lower level drivers can be loaded in any order
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once the scsi core is present in the kernel (either compiled in or loaded
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as a module). The disk driver (sd_mod.o), cdrom driver (sr_mod.o),
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tape driver ** (st.o) and scsi generics driver (sg.o) represent the upper
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level drivers to support the various assorted devices which can be
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controlled. You can for example load the tape driver to use the tape drive,
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and then unload it once you have no further need for the driver (and release
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the associated memory).
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The lower level drivers are the ones that support the individual cards that
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are supported for the hardware platform that you are running under. Those
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individual cards are often called Host Bus Adapters (HBAs). For example the
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aic7xxx.o driver is used to control all recent SCSI controller cards from
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Adaptec. Almost all lower level drivers can be built either as modules or
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built into the kernel.
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** There is a variant of the st driver for controlling OnStream tape
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devices. Its module name is osst.o .
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