On Sun, Sep 21, 2003 at 09:57:06PM -0700, Linus Torvalds wrote: > > On Sun, 21 Sep 2003, Linus Torvalds wrote: > > > > > > Odd... why do we ask for the first 8 bytes of page 8? The header alone is > > > 8 bytes.... anyway, the response looks good. > > > > It tries to read the cache type. It tries to read the header first, in > > order to figure out how much of page 8 it can read. The next command will > > read the header, up to a maximum of 128 bytes. > > > > That 128-byte maximum is strange, since we actually have a buffer of at > > least 512 bytes for it, but whatever.. The same device definitely can > > handle this in EHCI mode. > > > > I'll try to change that max size thing (maybe it really always wants to > > transfer just the header, or then the full page?), but regardless it looks > > like OHCI is a bit fragile. > > Actually, turning the max size _down_ to 64 bytes fixed the babble > problem. Don't ask me why, though.
Odd... but kinda expected, since the logs showed the first 64 bytes were
transferring properly.
> However, it does _not_ fix the more fundamental problem. Babble is gone,
> but now the trace looks like the appended..
>
> So it's not the babbling, but something _else_ with reading page 8 causes
> problems.
You say this worked with UHCI 'some time ago'? Perhaps that was before all
this mode page 8 stuff got settled?
Matt
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