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Implement "safe mode" boot process

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Lots of ways this could be done. I have chosen to set it up so it just boots with a minimum driver set.

On SBC test  by setting BT_REC_TYPE to BT_REC_SBC02 and use the 1-bit jumper (crtact) jumper to enable.

Options for other platforms needs to be considered.
This commit is contained in:
b1ackmai1er
2020-01-17 16:36:44 +08:00
parent 424676c469
commit 60df79fa4d
2 changed files with 91 additions and 2 deletions
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11
Source/HBIOS/std.asm
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@@ -23,7 +23,7 @@
FALSE .EQU 0
TRUE .EQU ~FALSE
;
; DEBUGGNG OPTIONS
; DEBUGGING OPTIONS
;
USENONE .EQU 0 ; NO DEBUG
USEXIO .EQU 1 ; BASIC SERIAL DRIVER
@@ -74,6 +74,15 @@ MM_Z180 .EQU 4 ; Z180 NATIVE MEMORY MANAGER
BT_MENU .EQU 1 ; WAIT FOR MENU SELECTION AT LOADER PROMPT
BT_AUTO .EQU 2 ; AUTO SELECT BOOT_DEFAULT AFTER BOOT_TIMEOUT
;
; BOOT RECOVERY METHODS
;
BT_REC_NONE .EQU 0 ; NO RECOVERY MODE
BT_REC_FORCE .EQU 1 ; FORCE BOOT RECOVERY MODE
BT_REC_SBC01 .EQU 2 ; ECB-SBCV2 - BIT 1 RTC HIGH
BT_REC_SBC02 .EQU 3 ; ECB-SBCV2 - 1-BIT IO PORT
;
BT_REC_TYPE .EQU BT_REC_NONE ; BOOT RECOVERY METHOD TO USE
;
; FLOPPY DISK MEDIA SELECTIONS (ID'S MUST BE INDEX OF ENTRY IN FCD_TBL)
;
FDM720 .EQU 0 ; 3.5" FLOPPY, 720KB, 2 SIDES, 80 TRKS, 9 SECTORS