Hi David,
I have found that on my sun4c, I need to increase the ESP_BUS_TIMEOUT from
250ms to 275ms when I build the ESP driver into the kernel or the ESP
does not find the disk.
If I build the driver as a module, this extra 25ms is not required. Any
idears?
Given that the V1 EPS driver used 275ms and the 250ms is only recommended
(SCSI II Std. ISO-IEC-9316-1995), should the ESP_BUS_TIMEOUT be changed
back to 275ms?
Regards
Mark Fortescue.
On Fri, 20 Jul 2007, Mark Fortescue wrote:
Ok.
I have found a difference in the timeouts. V1 driver it is 275ms, V2 driver
it is 250ms. It looks like that extra 25ms is needed on the sun4c :).
I will do a quick test with the existing setup as a modular ESP and then
re-build with a 275ms timeout and see if that fixes the problem.
Regards
Mark Fortescue.
On Fri, 20 Jul 2007, James Bottomley wrote:
On Fri, 2007-07-20 at 16:22 +0100, Mark Fortescue wrote:
Thansk for the info. I will try some experiments and see if I can work
out where the scsi commands/responses are getting lost.
Actually, for ESP it looks like you can alter the timeout ... it's the
parameter ESP_BUS_TIMEOUT in drivers/scsi/esp_scsi.h
It could be that the register calculation is off here ... but someone
who knows the device would have to look at it (or you could time it, I
suppose).
I do not beleave the issue with the ESP is a hardware problem. The PROM
and SunOS-4.1.1 have no problem finding/accessing the disk on the ESP and
I did not observe any issues prior to testing Linux v2.6.22. The V1 ESP
SCSI driver never failed to find the ESP disk (on kernels that got that
far) but I have not done as much testing with the V2 ESP driver as memory
problems post v2.6.21 needed to be fixed to get things up and running.
James
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