[BRLTTY] BRLTTY in GRUB2

[Dave Mielke]

Should the driver's fini() method be called when we're done with the serial 
port? If so, what does it do, and what should we call to open the port?

Can the fetch,put,fini methods fail? Should we be testing grub_errno after 
calling any of them?

Is there a list of supported serial speeds?

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