Hi, I've never done any real kernel debugging. Can anyone give any pointers on how to do early boot debugging on an old world (buggy OF) powermac? Can I do anything using a serial console?
A little reading last night suggested that spinlocks are supposed to disappear for single processor machines. I do not understand why they are present in 3.4.6 (at least the symbol anyway)? The 'acct_lock' spin lock was also missing with gcc 4.2.4. kevin On Sat, Jan 22, 2011 at 12:24 PM, kevin diggs <diggskevi...@gmail.com> wrote: > Hi, > > If I enable SMP then I can build a 2.6.28 kernel with gcc 4.3.5 that > WILL boot on the PowerMac8600 (single 750GX). The previously mentioned > G4 that runs is a dual cpu beast and thus also runs SMP. > > I at least know this (ok, I THINK I know): > > For non-SMP: The spinlock 'acct_lock' in kernel/acct.c that IS > present in 3.4.6 (i.e. kernel 2.6.28 compiled with gcc 3.4.6). Not so > much for 4.3.5. I have not yet done a general 4.3.5 compiled 2.6.28 > spinlock safari. > > Don't some funky, optimizery things happen to spinlocks for the NON-smp case? > > I'll see what the 4.2.x gcc does. > > Thanks! > > kevin > > P.S.: There is one other difference for the SMP 4.3.5 compiled > 2.6.28: my 750gx cpufreq driver gets disabled. It is fairly isolated > code though. Should not be able to nuke the spinlock in kernel/acct.c > > On Fri, Jan 21, 2011 at 1:26 PM, kevin diggs <diggskevi...@gmail.com> wrote: >> Hi, >> >> Anyone familiar with BootX? Could my problems with the 8600 be related >> to some interaction with BootX? >> >> kevin >> > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
