2.6 Abort & Reset Commands
--------------------------
These are implemented with busy waiting for interrupt to arrive.
- ibmmca_reset() and ibmmca_abort() do not work sufficently well
- up to now and need still a lot of development work. But, this seems
- to be even a problem with other SCSI-low level drivers, too. However,
+ ibmmca_reset() and ibmmca_abort() do not work sufficiently well
+ up to now and need still a lot of development work. This seems
+ to be a problem with other low-level SCSI drivers too, however
this should be no excuse.
2.7 Disk Geometry
not like sending commands to non-existing SCSI-devices and will react
with a command error as a sign of protest. While this error is not
present on IBM SCSI Adapter w/cache, it appears on IBM Integrated SCSI
- Adapters. Therefore, I implemented a workarround to forgive those
- adapters their protests, but it is marked up in the statisctis, so
+ Adapters. Therefore, I implemented a workaround to forgive those
+ adapters their protests, but it is marked up in the statistics, so
after a successful boot, you can see in /proc/scsi/ibmmca/<host_number>
how often the command errors have been forgiven to the SCSI-subsystem.
If the number is bigger than 0, you have a SCSI subsystem of older
not accept this, as they stick quite near to ANSI-SCSI and report
a COMMAND_ERROR message which causes the driver to panic. The main
problem was located around the INQUIRY command. Now, for all the
- mentioned commands, the buffersize, sent to the adapter is at
+ mentioned commands, the buffersize sent to the adapter is at
maximum 255 which seems to be a quite reasonable solution.
- TEST_UNIT_READY gets a buffersize of 0 to make sure, that no
+ TEST_UNIT_READY gets a buffersize of 0 to make sure that no
data is transferred in order to avoid any possible command failure.
- 2) On unsuccessful TEST_UNIT_READY, the midlevel-driver has to send
- a REQUEST_SENSE in order to see, where the problem is located. This
+ 2) On unsuccessful TEST_UNIT_READY, the mid-level driver has to send
+ a REQUEST_SENSE in order to see where the problem is located. This
REQUEST_SENSE may have various length in its answer-buffer. IBM
- SCSI-subsystems report a command failure, if the returned buffersize
- is different from the sent buffersize, but this can be supressed by
+ SCSI-subsystems report a command failure if the returned buffersize
+ is different from the sent buffersize, but this can be suppressed by
a special bit, which is now done and problems seem to be solved.
2) Code adaption to all kernel-releases. Now, the 3.2 code compiles on
2.0.x, 2.1.x, 2.2.x and 2.3.x kernel releases without any code-changes.
Guide) what has to be done for reset, we still share the bad shape of
the reset functions with all other low level SCSI-drivers.
Astonishingly, reset works in most cases quite ok, but the harddisks
- won't run in synchonous mode anymore after a reset, until you reboot.
+ won't run in synchronous mode anymore after a reset, until you reboot.
Q: Why does my XXX w/Cache adapter not use read-prefetch?
A: Ok, that is not completely possible. If a cache is present, the
adapter tries to use it internally. Explicitly, one can use the cache
git.openpandora.org / pandora-kernel.git / blobdiff