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Date: Sat, 06 Jan 2007 17:44:41 +0000
From: Matt Sealey <matt@genesi-usa.com>
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To: Andrew Turner <andrew@fubar.geek.nz>
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Cc: freebsd-ppc@freebsd.org
Subject: Re: More on the EFIKA
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"loaded before boot" by that do you mean they're in there from the firmware
or you're assuming the FreeBSD boot loader does it?

-- 
Matt Sealey <matt@genesi-usa.com>
Genesi, Manager, Developer Relations

Andrew Turner wrote:
> I have got a little further at booting on an EFIKA.
> 
> I noticed there are already TLB exception handlers loaded before boot.
> Using these I can read and write to an address in virtual memory. On
> the second write the kernel will panic with:
> 
> panic: mtx_lock() of spin mutex (null)
> @ /a/andrew/freebsd/efika/sys/kern/kern_sx.c:172
> KDB: enter: panic
> [thread pid 0 tid 0 ]
> Stopped at      0x29f3dc:       lwz     r11, r1, 0x0
> db> bt
> Tracing pid 0 tid 0 td 0x4d89d8
> 0x0048cc00: at panic+0x134
> 0x0048cca0: at _mtx_lock_flags+0xb4
> 0x0048ccd0: at _sx_xlock+0x40
> 0x0048ccf0: at _vm_map_lock_read+0x40
> 0x0048cd00: at vm_map_lookup+0x90
> 0x0048cd40: at vm_fault+0xb0
> 0x0048ce30: at trap_pfault+0x170
> 0x0048ce60: at trap+0x23c
> 0x0048cf00: at powerpc_interrupt+0xac
> 0x0048cf20: kernel DSI write trap @ 0xd0005000 by powerpc_init+0x410:
> srr1=0x3032 r1=0x48cfd0 cr=0x20004024 xer=0 ctr=0x101a5f0
> dsisr=0x42000000 0x0048cfd0: at powerpc_init+0x404
> 0x0048d000: at __start+0x90
> db> 
> 
> Removing the reads/writes I can the kernel up to the call to
> vm_mem_init in the system initialization tasks. The panic is identical
> to the one above.
> 
> Has anyone got any ideas as to where I can look to fix this panic?
> 
> Andrew
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