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Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware

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To: Yinghai Lu <yhlu.kernel@...>
Cc: Andres Salomon <dilinger@...>, H. Peter Anvin <hpa@...>, Eric W. Biederman <ebiederm@...>, Ingo Molnar <mingo@...>, Andrew Morton <akpm@...>, Joseph Fannin <jfannin@...>, <linux-kernel@...>, <jordan.crouse@...>
Date: Monday, April 21, 2008 - 12:05 am

Yinghai Lu wrote:

In SPARC land, at least on SunOS and Solaris, it was very convenient for 
debugging to interrupt the OS with Stop-A and use OFW to inspect the 
system state.  That was especially handy for live crash analysis.  Dumps 
are useful as far as they go, but they often fail to capture detailed 
I/O device state.

I was hoping to do that on x86 too.  So far we (OLPC) haven't 
implemented a sysrq hook to enter OFW, but I haven't given up hope yet.  
It doesn't cost much to leave OFW around, but once you decide to eject 
it, you can't easily get it back.

Apple made the early decision to eject OFW and just keep a device tree 
table.  That decision was probably due to several factors, including the 
rather lame state of Apple's first OFW implementation and the complexity 
of their OS startup process at the time (which included "trampolining" 
to a 68000 emulator to run their legacy code).  Once they went down that 
path, the die was cast, and the PowerPC community got used to the "OFW 
ends up as just a table" idea.

--
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Messages in current thread:
2.6.25-mm1, Andrew Morton, (Fri Apr 18, 4:47 am)
[Was: 2.6.25-mm1], Jiri Slaby, (Mon Apr 21, 4:31 am)
Re: [Was: 2.6.25-mm1], Al Viro, (Mon Apr 21, 5:06 am)
fault in __d_lookup [Was: 2.6.25-mm1], Jiri Slaby, (Mon Apr 21, 5:37 am)
Re: fault in __d_lookup [Was: 2.6.25-mm1], Al Viro, (Mon Apr 21, 5:45 am)
Re: fault in __d_lookup [Was: 2.6.25-mm1], Jiri Slaby, (Mon Apr 21, 5:59 am)
Re: fault in __d_lookup [Was: 2.6.25-mm1], Matthew Wilcox, (Mon Apr 21, 1:23 pm)
Re: fault in __d_lookup [Was: 2.6.25-mm1], Rafael J. Wysocki, (Mon Apr 21, 9:42 am)
internal compiler error: SIGSEGV [Was: 2.6.25-mm1], Jiri Slaby, (Sun Apr 20, 7:29 am)
Re: 2.6.25-mm1, Joseph Fannin, (Fri Apr 18, 11:10 pm)
Re: 2.6.25-mm1, Andrew Morton, (Fri Apr 18, 11:29 pm)
Re: 2.6.25-mm1, Arjan van de Ven, (Sat Apr 19, 2:21 pm)
Re: 2.6.25-mm1, Andres Salomon, (Sat Apr 19, 9:25 am)
Re: 2.6.25-mm1, Andrew Morton, (Sat Apr 19, 1:38 pm)
Re: 2.6.25-mm1, Andres Salomon, (Sat Apr 19, 1:50 pm)
Re: 2.6.25-mm1, Jordan Crouse, (Mon Apr 21, 10:56 am)
Re: 2.6.25-mm1, Andres Salomon, (Mon Apr 21, 11:05 am)
Re: 2.6.25-mm1, Jordan Crouse, (Mon Apr 21, 11:12 am)
[PATCH 2/2] OLPC: drop pre-OpenFirmware workarounds, Andres Salomon, (Sat Apr 19, 1:39 pm)
Re: [PATCH 1/2] OLPC: Add support for calling into Open Firm..., Mitch Bradley, (Mon Apr 21, 12:05 am)
Re: OLPC: only check for OFW signature on VSA-less Geodes, Jordan Crouse, (Mon Apr 21, 5:17 pm)
Re: OLPC: Add support for calling into Open Firmware, Jordan Crouse, (Mon Apr 21, 11:05 am)
Re: OLPC: Add support for calling into Open Firmware, H. Peter Anvin, (Mon Apr 21, 10:58 am)
Re: 2.6.25-mm1, Joseph Fannin, (Fri Apr 18, 10:25 pm)
Re: 2.6.25-mm1, Andrew Morton, (Fri Apr 18, 11:08 pm)
Re: 2.6.25-mm1, Joseph Fannin, (Fri Apr 18, 10:13 pm)
Re: 2.6.25-mm1, Andrew Morton, (Fri Apr 18, 11:02 pm)
Re: 2.6.25-mm1, Dmitry Torokhov, (Sat Apr 19, 12:14 am)
Re: 2.6.25-mm1, Andrew Morton, (Sat Apr 19, 12:29 am)
Re: 2.6.25-mm1, Takashi Iwai, (Mon Apr 21, 10:06 am)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Mon Apr 21, 1:55 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Takashi Iwai, (Tue Apr 22, 6:13 am)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Tue Apr 22, 2:31 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Takashi Iwai, (Wed Apr 23, 4:49 am)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Wed Apr 23, 4:02 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Takashi Iwai, (Thu Apr 24, 5:40 am)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Thu Apr 24, 11:51 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Takashi Iwai, (Fri Apr 25, 2:28 am)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Fri Apr 25, 12:45 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Dmitry Torokhov, (Fri Apr 25, 2:09 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Fri Apr 25, 2:31 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Dmitry Torokhov, (Fri Apr 25, 2:37 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Takashi Iwai, (Fri Apr 25, 12:51 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Takashi Iwai, (Fri May 2, 12:44 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Fri May 2, 12:57 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Takashi Iwai, (Tue May 6, 6:20 am)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Tue May 6, 12:51 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Fri Apr 25, 1:25 pm)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Takashi Iwai, (Wed Apr 23, 10:18 am)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Dmitry Torokhov, (Tue Apr 22, 10:01 am)
Re: 2.6.25-mm1 (snd-pcsp doesn't like DEBUG_PAGEALLOC), Stas Sergeev, (Tue Apr 22, 12:42 pm)
Re: 2.6.25-mm1, Takashi Iwai, (Mon Apr 21, 7:07 am)
Re: 2.6.25-mm1, Stas Sergeev, (Mon Apr 21, 3:45 pm)
Re: 2.6.25-mm1 (snd-pcsp causes driver conflict), Stas Sergeev, (Mon Apr 21, 1:44 pm)
Re: 2.6.25-mm1 (snd-pcsp causes driver conflict), Takashi Iwai, (Tue Apr 22, 6:09 am)
Re: 2.6.25-mm1 (snd-pcsp causes driver conflict), Stas Sergeev, (Tue Apr 22, 1:54 pm)
Re: 2.6.25-mm1 (snd-pcsp causes driver conflict), Takashi Iwai, (Wed Apr 23, 4:55 am)
Re: 2.6.25-mm1 (snd-pcsp causes driver conflict), Takashi Iwai, (Wed Apr 23, 10:14 am)
Re: 2.6.25-mm1, Joseph Fannin, (Sat Apr 19, 2:33 am)
2.6.25-mm1: orphaned files after build, Alexey Dobriyan, (Fri Apr 18, 7:09 pm)
Re: 2.6.25-mm1, , (Fri Apr 18, 4:14 pm)
Re: 2.6.25-mm1 (build error: trace selftest), Randy Dunlap, (Fri Apr 18, 12:45 pm)
Re: 2.6.25-mm1 (build error: driver core), Randy Dunlap, (Fri Apr 18, 12:40 pm)
Re: 2.6.25-mm1 (build error: driver core), Greg KH, (Fri Apr 18, 12:56 pm)
Re: 2.6.25-mm1 (build error: driver core), Dan Williams, (Fri Apr 18, 2:38 pm)
StackProtector Oopses - Re: 2.6.25-mm1, Reuben Farrelly, (Fri Apr 18, 9:02 am)
Re: StackProtector Oopses - Re: 2.6.25-mm1, Ingo Molnar, (Fri Apr 18, 9:36 am)
Re: StackProtector Oopses - Re: 2.6.25-mm1, Reuben Farrelly, (Fri Apr 18, 10:49 am)
Re: StackProtector Oopses - Re: 2.6.25-mm1, Ingo Molnar, (Mon Apr 21, 11:06 am)
Re: StackProtector Oopses - Re: 2.6.25-mm1, Arjan van de Ven, (Mon Apr 21, 9:48 pm)
Re: StackProtector Oopses - Re: 2.6.25-mm1, Ingo Molnar, (Tue Apr 22, 4:34 am)
Re: StackProtector Oopses - Re: 2.6.25-mm1, Arjan van de Ven, (Tue Apr 22, 10:29 am)
Re: StackProtector Oopses - Re: 2.6.25-mm1, Arjan van de Ven, (Fri Apr 18, 9:51 am)
Re: StackProtector Oopses - Re: 2.6.25-mm1, Reuben Farrelly, (Fri Apr 18, 10:41 am)
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