Bug#607416: Device table incorrect for drivers/s390/block/dasd_eckd.c: 3880/3390 should be 3880/3380

[Stephen Powell <zlinuxman@wowway.com>]

On Sat, 18 Dec 2010 19:59:00 -0500 (EST), Stephen Powell wrote:
> 
> This is a bug report for drivers/s390/block/dasd_eckd.c in the
> Linux kernel source code.  The device table indicates that a
> combination of a 3880 storage control unit and a 3390 DASD device
> type is valid.  This is incorrect.  A 3880 storage control unit
> cannot support a 3390 device type.  However, it can support a
> 3380 device type, and that is not present in the table.

In case anybody cares but doesn't know, the authoritative
reference on this subject is the following IBM publication:

IBM 3880 Storage Control
Models 1, 2, 3, and 4
Reference Manual
(Publication Number GA26-1661)

I happen to have a (hard) copy of this manual, the -6 version dated
April, 1983.  IBM didn't publish soft-copy documentation back
then, only hard copy.  Nevertheless, I was able to find a
soft-copy version on the internet.  Someone took his hard-copy
version, ran it page-by-page through a scanner, and converted
the results to a PDF file.  This copy is a newer revision,
the -9 version, dated September, 1987.  See

   http://www.bitsavers.org/pdf/ibm/dasd

look for the link titled

   GA26-1661-9_3880_StorageCtrlDescr_Sep87.pdf

single right click on it and select "Save Target as" from
the pop-up menu to download it.  Open it with whatever you
normally use to open a PDF file.  Of course, you can't search
it for text, since the whole manual is a collection of images,
due to the way it was created.

You won't get very far into the document before you will find
a list of devices supported by the control unit.  A 3390 is
not one of them.  But a 3380 is.  The only other device supported
by the Linux kernel that the 3880 Storage Control unit supports
is a 3370, which is an FBA device.  It is (correctly) listed
in the device table in drivers/s390/block/dasd_fba.c.

-- 
  .''`.     Stephen Powell    
 : :'  :
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