Date: Sat, 6 Jan 2007 23:38:22 +1300 From: Andrew Turner <andrew@fubar.geek.nz> To: freebsd-ppc@freebsd.org Subject: More on the EFIKA Message-ID: <20070106233822.7d70be78@hermies.int.fubar.geek.nz>
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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? Andrewhome | help
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