Keith Owens writes:
> Something I forgot to mention about debugging using screen writes. If
> the problem is caused by incorrect compiler output then even printk can
> fail. Not because the C code is wrong but because the generated
> assembler is wrong. Writing direct to screen memory is as simple as it
> gets and gives the compiler little or no chance to get it wrong.
And I'll try to make the point a second time that everything does not have
a character-based screen to write to.
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