1cf4ece53SMasayuki OhtakWhat: /sys/module/pch_phub/drivers/.../pch_mac 2cf4ece53SMasayuki OhtakDate: August 2010 3cf4ece53SMasayuki OhtakKernelVersion: 2.6.35 4cf4ece53SMasayuki OhtakContact: masa-korg@dsn.okisemi.com 5cf4ece53SMasayuki OhtakDescription: Write/read GbE MAC address. 6cf4ece53SMasayuki Ohtak 7cf4ece53SMasayuki OhtakWhat: /sys/module/pch_phub/drivers/.../pch_firmware 8cf4ece53SMasayuki OhtakDate: August 2010 9cf4ece53SMasayuki OhtakKernelVersion: 2.6.35 10cf4ece53SMasayuki OhtakContact: masa-korg@dsn.okisemi.com 11cf4ece53SMasayuki OhtakDescription: Write/read Option ROM data. 12cf4ece53SMasayuki Ohtak 13*cc62a7ebSKirill Smelkov 14*cc62a7ebSKirill SmelkovWhat: /sys/module/ehci_hcd/drivers/.../uframe_periodic_max 15*cc62a7ebSKirill SmelkovDate: July 2011 16*cc62a7ebSKirill SmelkovKernelVersion: 3.1 17*cc62a7ebSKirill SmelkovContact: Kirill Smelkov <kirr@mns.spb.ru> 18*cc62a7ebSKirill SmelkovDescription: Maximum time allowed for periodic transfers per microframe (μs) 19*cc62a7ebSKirill Smelkov 20*cc62a7ebSKirill Smelkov [ USB 2.0 sets maximum allowed time for periodic transfers per 21*cc62a7ebSKirill Smelkov microframe to be 80%, that is 100 microseconds out of 125 22*cc62a7ebSKirill Smelkov microseconds (full microframe). 23*cc62a7ebSKirill Smelkov 24*cc62a7ebSKirill Smelkov However there are cases, when 80% max isochronous bandwidth is 25*cc62a7ebSKirill Smelkov too limiting. For example two video streams could require 110 26*cc62a7ebSKirill Smelkov microseconds of isochronous bandwidth per microframe to work 27*cc62a7ebSKirill Smelkov together. ] 28*cc62a7ebSKirill Smelkov 29*cc62a7ebSKirill Smelkov Through this setting it is possible to raise the limit so that 30*cc62a7ebSKirill Smelkov the host controller would allow allocating more than 100 31*cc62a7ebSKirill Smelkov microseconds of periodic bandwidth per microframe. 32*cc62a7ebSKirill Smelkov 33*cc62a7ebSKirill Smelkov Beware, non-standard modes are usually not thoroughly tested by 34*cc62a7ebSKirill Smelkov hardware designers, and the hardware can malfunction when this 35*cc62a7ebSKirill Smelkov setting differ from default 100. 36