Hi There,
I try to port 2.4.9 ohci driver to a mips platform. I have following
questions, could anyone kindly clear me?
1. Every ED has a dummy TD. Will this dummy TD be processed by HC and put
into done queue? There is no data in the TD.
2. Sometime, I saw HC returns a TD with a CC field which is 0xf to HC
driver. Accroding to OHCI spec, 0xf means TD not accessed.If this TD did
not accessed by HC, how come this TD is put into done queue by HC?
3. Is that possible that HC driver get WDH interrupt but HccaDoneHead is 0?
4. My mips board has no PCI bus and HC just can access first 4M address
space(my kmalloc can take care of this). Is here any
one already ported usb-ohci driver to such kind of platform?
Any information will be appreciated.
Sun
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