Dear Marek,
}
This addresses EHCI cache problem, that's why you need bounce buffer,
right?
No. The problem was we were copying data word-by-word to a non-word
aligned memory in the USB gadget. So, this is different from the USB
host controller issue.
I see ... why isn't buffer aligned by the usb stack then?
because it might not be a requirement higher up. i.e. it's dealing with a
data byte stream. forcing all higher layers to use 32bit alignment because
this host controller requires 32bit alignment in its FIFOs is incorrect.
The usb gadget is used by the usbtty so we can receive any number of
bytes and, as Mike explains, we cannot force 32-bit alignment.
Thanks
Amit Virdi
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