More on the EFIKA

[Raquel Velasco and Bill Buck]

Nice work Andrew!

Does anyone else out there is FreeBSD land want an EFIKA to work  
with?  If you are ready to assist Andrew, we would be willing to ship  
you a board.

Best regards,
R&B

On Jan 6, 2007, at 4:38 AM, 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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