The method for doing this is to try and use the DATA COMPRESSION mode page
first, followed by the DEVICE CONFIGURATION page (this is because most newer
tape devices are now using DATA COMPRESSION instead of DEVICE CONFIGURATION
pages).
Add in the logical && hardware read position and set position ioctls. Oddly
enough, because NetBSD is limited in having the driver track file && record
numbers, the usual agony over what to do once you use logical or hardware
block positioning can be avoided. Amusing.
Make a minor change so that for SCSIVERBOSE cases that SCSI_SILENT in
the xs' flags is still observed.
[1] add EN_ENIDMAFIX - the byte-aligner on the ENI version of the card
appears to lose under heavy load so avoid using it. see comment
in midway.c for full details.
note that the Adaptec version of the card works properly under
load.
detected by Kenjiro Cho <kjc@csl.sony.co.jp> [confirmed by chuck]
fix by chuck & kjc
[2] update some freebsd specific code [from kjc]
[3] for circular buffers: ensure there is always one free slot so
that we can easily tell the difference between a full and
empty list. re-structure a few loops to reflect this.
fixes a problem with mbufs being free'd while still in DMA,
and makes drive a bit more robust.
detected and fixed by kjc
memory-mapped or i/o-mapped access to the device registers, and always
choose memory-mapped if it is enabled. In particular, do _not_ explictly
disable the space we decide to not use, as this confuses some versions
of Alpha console software (which are arguably buggy because of this
problem).
Also, fix a logic error pointed out by Ross Harvey <ross@teraflop.com>
that would cause memory-mapped access to never be enabled.
* support chip clocks != COM_FREQ, by introducing sc_frequency (for the
mainline code) and adding a frequency parameter right after the rate
parameter to comcnattach() and com_kgdb_attach().
- Make com_isa and com_multi initialize sc_frequency to COM_FREQ.
- Make i386/machdep.c and alpha/dec_xxx.c call com*attach() with the freq.
parameter.
* supio_attach_args get two more fields: a sc_ipl and a sc_arg, both ints.
- com_supio uses the first for interupt establishment (all childs will, as
soon as they exist) and the 2nd for sc_frequency.
- drsupio passes sc_ipl alway as 5, and for the "com"s, sc_arg as 16*115200
- hyper will pass sc_ipl as 6, and sc_arg as 16 * 460800
christos