On 18.12.2013, at 22:04, Benjamin Herrenschmidt <b...@kernel.crashing.org> wrote:
> On Wed, 2013-12-18 at 13:34 +0100, Alexander Graf wrote: >> Hrm. Are you 100% sure this correct? This UniNorth is a real headache. >> The closest thing to a spec for it is the U4 spec which is generations >> ahead: >> >> http://www.datasheetarchive.com/dl/Datasheets-SW3/DSASW0048084.pdf >> >> On that at page 109 you can see that you do indeed have a range of >> registers and a few fancy modes that can even be used to directly >> access config space registers without the usual index/data cycle. >> >> Ben, do you have any more insight into how the original Uninorth >> worked? > > Just index/data. Look at Linux :-) Then I don't understand why we break when we limit the data region to 4 bytes. Alex
