[BRLTTY] BRLTTY in GRUB2

[Dave Mielke]

There's one place in the code which does an 80 microsecond pause, which, of 
course, is less than a millisecond. Even though there's no particular need to 
include this part in the grub build, it'd still be kind of nice to address it. 
Does grub offer any way to sleep for less than a millisecond?

What's the difference between grub_get_time_ms() and grub_get_rtc()?

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