Messages in this thread | | | Date | Thu, 11 Mar 2004 14:53:34 -0800 | From | George Anzinger <> | Subject | Re: [Kgdb-bugreport] [PATCH] Kill kgdb_serial |
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Tom Rini wrote: > On Thu, Mar 11, 2004 at 01:33:40PM -0800, George Anzinger wrote: > > >>Tom Rini wrote: >> >> >>>>I am afraid I don't quite understand what he was saying other than early >>>>init stuff. On of the problems with trying early init stuff, by the way, >>>>is that a lot of things depend on having alloc up and that happens rather >>>>late in the game. >>> >>> >>>I assume you aren't talking about kgdb stuff here (or what would be the >>>point of going so early) but I believe he was talking about allowing for >>>stuff that could be done early, to be done early. >> >>One of the issues with the UART set up is registering the interrupt handler >>with the kernel. It will fail if alloc is not up. The -mm patch does two >>things with this. a) It tries every getchar to register the interrupt >>handler, and b) it has a module init entry to register it. This last will >>happen late in the bring up and is safe. a) is there to get it ASAP if you >>are actually using kgdb during the bring up. > > > There's two ways to look at this. > - All the more reason to acknowledge that the earliest you can safely > get into KGDB is point X, where X is where alloc works,
Just to get ^C to work? I would rather give it up entirely! mappings done > if needed, etc, etc, and IFF we change things slightly in kgdboe so > that it can call kgdb_schedule_breakpoint() if it needs to as an > initial break, and handle setting kgdb_serial to the serial driver in > kgdb_arch_init, or something, and remove all of the extra kludges to > get us a few lines / function calls earlier on. > - More and more special cases.
How about a command line set up ASAP which calls a driver entry to do the break. The driver being serial does it NOW, but being some thing that needs additional resources, just sets a flag to break when it gets them and returns. Seems rather simple. > > Roughly. :) >
-- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml
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