> Given that sort of issue, switching cables could matter too. Not
> all "old" cables are evidently capable of handling high speed
> signals.
That as actually one of the first things I tried when I encountered the
problems. I tried 5 diffent cables, all marked with "USB 2.0 compatible". 4
of them produced nearly the same kind and level of resets/disconnects. One
was really bad and produced a lot more erros. I've thrown it into the
trashcan as soon as I found out.
> You can tell NEC 0.95 vs 1.0 by the part number, as I recall. 720100 being
> a 0.95 part, and I don't have a 1.0 version. The 0.95 is pretty solid
> under Linux.
Just found out that we have a Adaptec-brand controller using a EHCI 1.0 NEC
chip in one of the servers at work:
kernel: ehci_hcd 0000:00:0e.2: EHCI Host Controller
kernel: ehci_hcd 0000:00:0e.2: irq 5, pci mem 0xdffffe00
kernel: ehci_hcd 0000:00:0e.2: new USB bus registered, assigned bus number 1
kernel: ehci_hcd 0000:00:0e.2: USB 2.0 initialized, EHCI 1.00, driver 26 Oct
2004
00:0e.2 USB Controller: NEC Corporation USB 2.0 (rev 04) (prog-if 20 [EHCI])
Subsystem: Adaptec: Unknown device 091e
Flags: bus master, medium devsel, latency 64, IRQ 5
Memory at dffffe00 (32-bit, non-prefetchable) [size=256]
Capabilities: [40] Power Management version 2
The website of our dealer says it has a NEC D720100AS1 chip on it. But I doubt
that since NEC says 720100 is EHCI 0.95 and 720101 is EHCI 1.0
(http://www.necel.com/usb/en/index.html). Is the output of the linux ehci
driver reliable or can the vendor easily fake that?
I'll take a look at the chip itself tomorrow...
It is more expensive (40 euros) compared to the via/ali boards I tried (about
10 euros). I have no problems paying more if I pay for a good board/chip and
not just for the brandname...
Probably I'm going to mail order one of those controllers (my local dealer
doesn't have them).
And another thing: we don't have any problems with backup to a usb-ide on this
server at work, even with a genesys usb-ide chip...
Kind regards,
Gerd
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