On Wed, 26 Jan 2000, Markley, Todd wrote:
> Dick:
> I think you are asking me to comment out the `je a20_wait`
> line in setup.S. I have now tried this and get the same results.
> The problem system still hangs just before "Uncompressing" and
> the same kernel boots fine on my laptop.
>
Yes. So we know that it's not hung waiting for the alias to disappear.
> At this stage of the boot is it possible to insert some
> kind of PRINT debugging in setup.S to find out where it hangs?
> Something like:
At the top of the file, line 179, you will see a routine called
prtchr. It prints a character in the AL register. Just ahead of
it is prtstr, it prints a string, but don't use it because you
have to set the DS register, restore it later, etc.
Just, moving through the code, do:
mov 0x30, al # ASCII '0'
call prtchr
.... more code, possible hung loops
mov 0x31, al # ASCII '1'
call prtchr
... etc.
You will have 0123 on the screen if it hangs between '3' and '4'.
Easy! Have fun.
Cheers,
Dick Johnson
Penguin : Linux version 2.3.39 on an i686 machine (800.63 BogoMips).
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