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My older computer (1999 Dell PIII) was strictly USB 1.1. ehci_ocd |
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would die when I tried loading it, and only ohci_ocd would work. All my |
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USB devices ran ("crawled" might be more accurate) according to spec. |
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Even "mount -t auto" worked OK for USB filesystems (SD card and external |
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hard drive). |
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|
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Yesterday, I got a hunch that this might be a clue to my problems on |
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my newer machine. With only ehci_hcd (with or without root hub |
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translation) some of my older USB devices would not work at all. With |
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*BOTH* ohci_ocd and ehci_ocd built into the kernel, the older USB |
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devices were a bit flakey. "mount -t auto" would die, but |
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"mount -t reiserfs" (or whatever) would work OK for the SD card. The |
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external hard drive refused to work. Mount commands failed with the |
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complaint that /dev/sdb1 was not a block device (or sometimes did not |
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exist). It's *SUPPOSED* to be USB2, but the connecter looks like a |
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USB1.1 connector. Unlike the shirt-pocket drives, the big external USB |
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has its own power supply, so power should not be an issue. |
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|
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Since I do have 2 USB2 shirt-pocket drives (off-site backup, one of |
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them is always in my safety-deposit box), I don't want to go back to |
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ohci-only. After testing various combinations, I settled on building |
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ohci_hcd into the kernel, and making ehci_ocd a module. So now... |
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|
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- all my USB stuff runs fine under ohci_hcd, except for the fact that |
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USB2 stuff runs a lot slower. |
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|
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- after "modprobe ehci_hcd", my USB2 drives run at USB2 speed, but |
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USB1.1 peripherals are either flakey or non-functional and |
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"mount -t auto" no longer works. |
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|
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- after I "rmmod ehci_hcd" things work as before under ohci_hcd. I |
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have to run "udevstart" if I want to use a device name that I've set |
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up with /etc/udev/rules.d/10-local.rules |
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|
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Anybody have any ideas on getting ohci_hcd and ehci_hcd to co-exist |
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and/or force some of my USB stuff to use ohci_hcd? Here's a few listings |
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of /proc/bus/usb/devices |
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|
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External drive under ehci_hcd; does not work. |
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|
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T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh=10 |
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B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0 |
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D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1 |
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P: Vendor=0000 ProdID=0000 Rev= 2.06 |
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S: Manufacturer=Linux 2.6.15-gentoo-r1 ehci_hcd |
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S: Product=EHCI Host Controller |
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S: SerialNumber=0000:00:02.1 |
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C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA |
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I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub |
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E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=256ms |
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|
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T: Bus=01 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 20 Spd=480 MxCh= 0 |
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D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 |
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P: Vendor=03e0 ProdID=6830 Rev= 0.01 |
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S: Manufacturer=PI-036 |
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S: Product=1394/USB2.0 COMBO Drive |
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S: SerialNumber=000000007254 |
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C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA |
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I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage |
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E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms |
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E: Ad=88(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms |
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|
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|
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|
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Works under ohci_ocd. |
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|
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T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh=10 |
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B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 |
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D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 |
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P: Vendor=0000 ProdID=0000 Rev= 2.06 |
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S: Manufacturer=Linux 2.6.15-gentoo-r1 ohci_hcd |
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S: Product=OHCI Host Controller |
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S: SerialNumber=0000:00:02.0 |
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C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA |
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I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub |
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E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms |
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|
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T: Bus=01 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 |
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D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 |
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P: Vendor=03e0 ProdID=6830 Rev= 0.01 |
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S: Manufacturer=PI-036 |
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S: Product=1394/USB2.0 COMBO Drive |
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S: SerialNumber=000000007254 |
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C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA |
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I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage |
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E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms |
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E: Ad=88(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms |
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-- |
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Walter Dnes <waltdnes@××××××××.org> In linux /sbin/init is Job #1 |
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My musings on technology and security at http://tech_sec.blog.ca |
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-- |
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