Hi David,
you wrote: - Devices on some EHCI controllers could handle DMA to/from high memory. Driver probe() routines can notice this using a generic DMA call, then tell higher level code (network, scsi, etc) about it like this:
if (dma_supported (&intf->dev, 0xffffffffffffffffULL)) net->features |= NETIF_F_HIGHDMA;
There's no fixed connection with USB 2.0, is there?
No, just with EHCI ... which can talk USB 1.1 through transaction translating hubs. In theory, other USB controllers could also be developed, with highmem support.
So all net usb driver should do that, shouldn't they?
Yes, though I don't know how many USB network driver will be used on systems with enough memory to make it matter!
- Dave
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