Messages in this thread | | | From | Segher Boessenkool <> | Subject | Re: [PATCH] Open Firmware device tree virtual filesystem | Date | Wed, 3 Jan 2007 16:31:45 +0100 |
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>> Kill OF? sparc does not want that IMO, how else should I return to >> the 'ok' prompt? > > PowerPC kills OF because it really has to,
No it doesn't. It has to on some (very common, heh) subarchs.
> that's one of numerous > reasons that it started sucking the device tree into a kernel copy > early in the bootup and using that for device discovery etc. > > To be honest, the 'ok' prompt is of limited value when you have > things like Alt-SysRq and PPC's XMON debugger in the kernel already.
When I ported the PowerPC kernel to a new platform years ago, the big problems happened *before* any of those methods worked, at really early boot time (the PowerPC port has become a lot better since then fwiw, it might be easier now). Running (and debugging) other client programs was a lot easier, since you could always drop back to OF on panic conditions so you could investigate what was going on without using hardware probes.
> In fact, the 'ok' prompt is an ENORMOUS pain in the ass to support > on machines with USB keyboards, because sharing the USB host > controller is beyond non-trivial. I've never implemented support > for that on sparc64 and I frankly have no desire to do the work > necessary to support that. It simply is not worth it.
Oh yes, USB keyboards, lovely. Use a serial port, or a dedicated network controller, or similar, for the OF console instead ;-)
Segher
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