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Hello,

On Dec 5, 2006, at 15:26, Christian Groessler wrote:

> I recently upgraded my beige G3 (open firmware 2.4) to -current.
>
> The console doesn't work anymore, it only displays half a line (the
> upper parts of the characters) at the bottom of the display.
>
> The following change fixes this and the console works as before:
>
> -------------------
> RCS file:
> /net/swamp/zeug/netbsd-rsync/main/src/sys/arch/macppc/dev/ofb_cons.c,v
> retrieving revision 1.1
> diff -u -p -r1.1 ofb_cons.c
> --- ofb_cons.c  8 Nov 2006 01:25:10 -0000       1.1
> +++ ofb_cons.c  5 Dec 2006 18:33:55 -0000
> @@ -101,6 +101,7 @@ ofb_cnattach()
>
>         /* get current cursor position */
>         OF_interpret("line#", 1, &crow);
> +       if (crow) crow--;
>
>         /* move (rom monitor) cursor to the lowest line - 1 */
>         OF_interpret("#lines 2 - to line#", 0);
> -------------------
>
> I did this change from some guts feeling that crow might not return
> the current position as written in the comment, but the total number
> of lines. (Which thinking about it now doesn't really make sense,
> given the different character heights of the ofb console and the
> NetBSD console fonts.)

Much of the code is cargo cult anyway, I just didn't get around to do a 
real cleanup yet.
When running in less than 1024x768 ofb will steal the font from OF, in 
an attempt to somehow emulate its look. Maybe that should be made the 
default and - maybe - overridden when a driver attaches later on.

> Now the questions:
>
> - can I somehow run this "line#" command from the ofb console to see
>   what it returns?

Just type it in on the OF prompt, then '.' will show what it left on 
the stack.

> - can I read the variables of a running kernel? I wrote the crow
>   value into a global kernel variable to get its value. Then I tried
>   to crash the kernel to get a kernel dump. This didn't work (no
>   kernel dump), probably because my swap space is a bit smaller than
>   the machine's memory. How would I read the variables of a live
>   kernel, given that I have a netbsd.gdb file with all the symbols?

just add printf()s, they'll end up as kernel output.

have fun
Michael
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