> Does a 'tr' give usefull infos ?

The panic was in siop_attach, so I didn't bother getting a stack trace. I have done one now, and here it is

db> tr
siop_pci_attach(1f87900, 1f97800, 1c08ce0, 12b5b08, 0, 1f97828) at siop_pci_atta
ch+0x28                                                                        
config_attach(1f97800, 1808498, 188cc00, 1293cf4, 1c08ce0, 1806800) at config_at
tach+0x284                                                                     
config_found_sm(1f87900, 1c08ce0, 1293cf4, 1293e8c, 1293c00, 1813a98) at config_
found_sm+0x30                                                                  
pci_probe_bus(1f87900, 8, 0, 1f87900, 2, ffff) at pci_probe_bus+0x2f8
pciattach(13ac398, 1f87900, 1c09170, 1293b24, 0, 1f87927) at pciattach+0x1c0
config_attach(1f87900, 1808498, 188cc00, 12c4d3c, 1c09170, 1806800) at config_at
tach+0x284                                                                     
config_found_sm(1f99a80, 1c09170, 12c4d3c, 0, 1f99d00, 1f99c00) at config_found_
sm+0x30                                                                        
ppbattach(1f87a00, 1f99a80, 1c09420, 12c4c60, 0, 1f99aa7) at ppbattach+0xcc
config_attach(1f99a80, 1808498, 188cc00, 1293cf4, 1c09420, 1806800) at config_at
tach+0x284                                                                     
config_found_sm(1f87a00, 1c09420, 1293cf4, 1293e8c, 1293c00, 1813a98) at config_
found_sm+0x30                                                                  
pci_probe_bus(1f87a00, 8, 0, 1f87a00, 0, ffff) at pci_probe_bus+0x2f8
pciattach(13ac398, 1f87a00, 1c097f0, 1293b24, 0, 1f87a27) at pciattach+0x1c0
config_attach(1f87a00, 1808498, 188cc00, 12df908, 1c097f0, 1806800) at config_at
tach+0x284                                                                     
config_found_sm(1f87b00, 1c097f0, 12df908, 0, 1f99c80, 1f99d00) at config_found_
--db_more--                                                                    
sm+0x30                                                                        
psycho_attach(1c097e0, 1f87b00, fffc6000, 1826c00, 1c097f0, 1466400) at psycho_a
ttach+0x838                                                                    
config_attach(1f87b00, 1808498, 188cc00, 130f0c4, 1c09ab0, 1806800) at config_at
tach+0x284                                                                     
config_found_sm(1f99f00, 1c09ab0, 130f0c4, 0, 1c09ad0, 1813a98) at config_found_
sm+0x30                                                                        
mainbus_attach(0, 1f99f00, 0, 130f218, 0, 1f99f2b) at mainbus_attach+0x32c
config_attach(1f99f00, 1808498, 188cc00, 0, 0, 1806800) at config_attach+0x284
config_rootfound(1471358, 0, 111e2d8, 1, 1f9ae00, 1813a98) at config_rootfound+0
x4c                                                                            
cpu_configure(188cc00, 188cf90, 1108c9c, 0, 0, 1813a98) at cpu_configure+0x44
configure(c1c0, 1524, 54a, 18a5000, fffffffffffffc00, 414) at configure+0x3c 
main(1808400, 1808400, 188cc00, 138b800, 1888400, 1832400) at main+0x3c4    
cpu_initialize(800000, e10, 1000000, fffa9a80, 18, 18) at cpu_initialize+0x32c
db>