boot panic on current(04.20)

[Gustavo Perez Querol]

>
> Root mount waiting for: usbus4
> uhub4: 8 ports with 8 removable, self powered
> Root mount waiting for: usbus4
> ugen4.2: <NEC> at usbus4
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x0
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xc08ed3a3
> stack pointer           = 0x28:0xe4c38b40
> frame pointer           = 0x28:0xe4c38b44
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0,pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 28 (usbus4)
> trap number             = 12
> panic: page fault
> cpuid = 0
> uptime: 5s


  I'm having the same problem with my laptop. It fails (if I remember
well) when checkig an <O2 Micro> device (probably my card reader, don't
know). When rebooting got to loader prompt, unload kernel and load
/boot/kernel.old/kernel. This arrises a few questions :

        1.- How can I install a custom kernel under a different directory
             under /boot. I did it, but I can't find how I did it. I think


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