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Re: Booting Linux on Vadem Clio

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Subject: Re: Booting Linux on Vadem Clio
From: "Bradley D. LaRonde" <>
Date: Mon, 19 Jul 1999 13:45:44 -0400
OK, it's calling the "Other" exception vector, so it's not a reset (doh),
NMI, TLB Refill, or XTLB Refill (whatever that is).  Let's see, that
leaves... a whole ton of things.  :)

So I tried disabling interrupts.  Guess what?  It now calls the TLB Refill
vector.  Hmmm...  So now I have to handle that exception.

This is odd because how am I supposed to handle this stuff when the kernel
hasn't been started, and init_trap hasn't been called?

Warner, you mentioned I might be getting a trap when I jal.  According to
the docs, jal will not generate any exceptions.  So how can I get a TLB
refill exception from it?  Am I reading the docs wrong.

Well, it would seem that the next step is to figure out what address is
causing the TLB refill exception.

Any other suggestions?


>>I don't know.  This is very odd....
>>You might want to put the LED flashing code in the trap handler to
>>make sure you aren't getting a trap for some reason when it tries to
>>jump to prom_init....
>Good advice, thank you.  I put the LED flashing code in all the exception
>vectors and it is now getting executed.  Now I'm trying to figure out which
>exception it is (I just jumped to the same blink for all three vectors) and
>what is causing it.  I plan to report on this later today.
>This makes me wonder though:  head.S doesn't do init_trap.  That's not done
>until main.c:start_kernel.  So how is that all of these other mips machines
>can jal in head.S without trapping?

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