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New USB host controller drivers: usbhcd191.zip

May 10, 2013 by lars.erdmann@arcor.de

I have updated the USB host controller drivers


USBUHCD.SYS, USBOHCD.SYS, USBEHCD.SYS, USBD.SYS (and now also: USBRESMG.SYS)
I have now placed these on hobbes.
hobbes.nmsu.edu/download/pub/incoming/usbhcd191.zip


They will eventually make it into directory:
/pub/os2/system/drivers/misc


1) USBEHCD: setting speed (/S: switch) back to the default of 8 (if /S:
not specified). Unfortunately, a "chkdsk x: /F:3" against a HPFS
formatted stick will otherwise lead to problems.
Everyone who had problems with USBEHCD.SYS should now either run with
/S:8 or not specify /S: switch at all. You can experiment with lower
values (/S:4, /S:2, /S:1) to see if that will still work on your system.
USBMSD.ADD would need updates in order to be able to queue transmission
requests and therefore increase the throughput.
Currently it will only issue a transmission once the preceding
transmission has finished.
Other fixes were made to allow to attach USB mice and keyboard to
external USB hubs.


3) USBD: reset external USB hubs before powering on ports. This should
fix some problems where devices plugged into external hubs won't
properly attach.


4) USBRESMG, USBUHCD, USBOHCD: nothing, just increased version number

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