9 Jul
2012
9 Jul
'12
12:32 a.m.
Dear Marek,
On Mon, Jul 9, 2012 at 1:31 AM, Marek Vasut marek.vasut@gmail.com wrote:
non-ARMv7 system now to do some testing... But it used to work without any alignment, right? (with disabled dcache,
of
course) That makes me think that data buffers don't need any alignment (from USB pov, not cache) and 32-byte alignment is required for internal structs only.
Hm.. I have to admit I'm not very much into USB specs and I don't have
any See ehci-r10.pdf ... chapter 3.5 ... the buffer pointer has to be aligned too it seems.
But in practice it works without any alignment... ok, you made me read the spec ;) page 55: "For the page 0 current offset interpretation, this field is the byte offset into the current page"
Regards, Ilya.