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Bootloader isn't forgiving about int13 failures #7

Description

@theseankelly

Currently, we give up after the first int13 fails. Not a problem for emulation, but reading likely has a chance of failure.

Proposed solution:

  • determine the max recommended amount of bytes to read
  • keep a count for retries
  • for each retry, reduce the number of bytes being read (reduces chance of failure)

Affects cdboot.S and stage2.S

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