>Another small question I hope someone with professional knowledge can
>help. I was told ECP/bidirectional printer cable can handle 2Mbps data
>transfer, that seems to be suggesting using parallel cable is as good as
>using USB1 cable (as USB1 is supposed to handle 1.2Mbps ony), or even
>better. Is it true?
Low speed devices like mouse, keyboard uses 1.5Mbps, printer should use 12Mbps on USB 1.1. Definitely better than ECP...
On 6/23/06, 张�|武 <[EMAIL PROTECTED]> wrote:
This is really making me puzzle:
sappho ~ # lspci | grep USB
0000:02:02.0 USB Controller: NEC Corporation USB (rev 41)
0000:02:02.1 USB Controller: NEC Corporation USB (rev 41)
0000:02:02.2 USB Controller: NEC Corporation USB 2.0 (rev 02)
Use lspci -v | grep USB, that should give you also information if it's OHCI, UHCI or EHCI (there are 3 standards, not only two). OHCI is 1.1 EHCI/UHCI is two different standards for 2.0, depends on hardware vendor.
When the kernel boots it shows me that only ohci device is discovered,
someone suggested that ohci only support USB 1.x. Now lspci shows the
card has "USB 2.0". I don't understand, does it work in the way that the
card either work in 2.0 mode with one device, or USB 1.0 with two
separate devices?
What if I remove OCHI and add back only UHCI driver in the kernel?
You can leave both enabled in the kernel. OHCI will be used if you connect 1.1 device, EHCI/UHCI (depends on which you discover with lspci -v) will be used with 2.0 devices.
Caster
