Turns out AMCC on t600x throws errors when DISP0 real-time memory
requests hit the CPU cache, and then macOS panics.
Signed-off-by: Hector Martin <marcan@marcan.st>
We saw some crazy speculation running in the HV breaking things by
reading from invalid RAM, so let's actually map only what's available.
For now we do map all lowmem as we haven't seen SErrors there yet, but
we stop at the high boundary.
Fixes: #97
Signed-off-by: Hector Martin <marcan@marcan.st>
This is like fb_console_scroll(), but only scrolls if necessary to
ensure that enough free space is available at the end of the console.
This avoids spuriously scrolling during shutdown if we still have space.
Signed-off-by: Hector Martin <marcan@marcan.st>
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Signed-off-by: Sven Peter <sven@svenpeter.dev>
