On Mon, Aug 10, 2009 at 04:53:09PM +0200, Ithamar R. Adema wrote: > Ralf Baechle wrote: >> Printing is hardware specific; the debug code will need to be changed for >> practically every MIPS platform on the planet, so I'm not too fond of the >> idea unless somebody comes up with a cleaner infrastructure to do so. >> Unfortunately we're not setup very well to do configuration detection etc. >> in that debug code without adding tons of baggage. >> > Would mimicing the uncompress.h header as used in the ARM architecture > be an idea? Maybe have one that does nothing in mach-generic and let the > machines that want debug output define their own that actually does IO. > > Just a header, defining putc()-ish functions, most architectures already > have code for that, so it should be trivial for them to implement it, if > wanted... > > Just an idea... Oh, I wasn't trying to kill the debug code entirely but pointing out some difficulties. For some platforms the code would be a little larger and more complex. It could be as bad as dynamically detecting a console and running PPP to talk to it. Or having to carry fonts along and render output into a complex graphics card. but we can still deciede if the feature is useful enough on a per platform base. An implementation would probably look something like you pointed out though I haven't seen the ARM header you mentioned. Ideally code could be shared with early printk. Ralf
