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Reimplement Duodyne boot recovery

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Add feature description in documentation.
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2024-11-30 23:27:02 +08:00
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Source/Doc/SystemGuide.md
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@@ -499,6 +499,25 @@ The startup then proceeds very much like the Application Boot
process described above. HBIOS is installed in its operating bank
and control is passed to the Boot Loader.
## Boot Recovery
To assist users when driver faults or misconfiguration causes a boot
failure, RomWBW supports a limited recovery cabability. This is
acheived by allowing the user to reboot their machine, loading
a minimal driver set. Implementation of this feature requires a
hardware input "BOOT RECOVERY" button to be available and
appropriate software configuration to be completed in the HBIOS.
When implemented, holding the "BOOT RECOVERY" button in after a
reset or power cycle will cause the normal driver load process to
be skipped in preference to a minimal set of drivers being loaded.
Typically this would be: Serial communication, RAM disk and parallel
port IDE interface drivers.
Platforms supporting this option currently are the MBC, Duodyne and
latter version of the ECB-SBC-V3.
# Driver Model
The framework code for bank switching also allows hardware drivers to be