[linuxsh-dev] UNTESTED: auto-VBR patch

[Mitch D. <md...@po...>]

Hi everyone,

At present, the value of the VBR is a compile-time option.  Setting it
correctly is vital if interrupts are to operate properly.

If you're using something such as the sh-ipl+g boot loader which already
sets the VBR (and provides the LinuxSH BIOS for serial output and debugging)
then you can avoid specifying the VBR by saving then re-using the
pre-existing value.

This patch (which is untested) does just that.  Does anyone want to
try it?  (Comments welcome)

Regards,

Mitch.

PS: This is the same idea as one that was discussed 4 months ago.
We wrote the code and posted it to the list, but then misplaced it.
This patch is a rewrite from memory.