Flash file system

First steps - chip identification

Source/Doc/Architecture.md

@@ -678,7 +678,7 @@ Read Block Count sectors to buffer address starting at current target
 sector. Current sector must be established by prior seek function; however,
 multiple read/write/verify function calls can be made after a seek
 function. Current sector is incremented after each sector successfully
-read. On error, current sector is sector is sector where error occurred.
+read. On error, current sector is sector where error occurred.
 Blocks read indicates number of sectors successfully read.
 
 Caller must ensure: 1) buffer address is large enough to contain data for

Source/HBIOS/cfg_sbc.asm

@@ -197,8 +197,10 @@ UFBASE		.EQU	$0C		; UF: REGISTERS BASE ADR
 AUDIOTRACE	.EQU	FALSE		; ENABLE TRACING TO CONSOLE OF SOUND DRIVER
 SN76489ENABLE	.EQU	FALSE		; SN76489 SOUND DRIVER
 SN7CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
-
+;
 AY38910ENABLE	.EQU	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AY_CLK		.EQU	CPUOSC / 4	; DEFAULT TO CPUOSC / 4
 AYMODE		.EQU	AYMODE_SCG	; AY: DRIVER MODE: AYMODE_[SCG/N8/RCZ80/RCZ180]
 SPKENABLE	.EQU	FALSE		; SPK: ENABLE RTC LATCH IOBIT SOUND DRIVER (SPK.ASM)
+;
+FFENABLE	.EQU	TRUE		; ENABLE FLASH/EEPROM IDENTIFICATION/DRIVER

Source/HBIOS/flashfs.asm

@@ -0,0 +1,151 @@
+;
+;==================================================================================================
+;   FLASH DRIVER FOR FLASH & EEPROM PROGRAMMING 
+;
+;	26 SEP 2020 - CURRENTLY ONLY IMPLEMENTS CHIP IDENTIFICATION -- PHIL SUMMERS
+;==================================================================================================
+;
+;	UPPER RAM BANK IS ALWAYS AVAILABLE REGARDLESS OF MEMORY BANK SELECTION. HBX_BNKSEL AND
+;	HB_CURBNK ARE ALWAYS AVAILABLE IN UPPER MEMORY AND THE STACK IS ALSO IN UPPER MEMORY DURING 
+;	BIOS INITIALIZATION. TO ACCESS THE FLASH CHIP FEATURES, CODE IS COPIED TO THE UPPER RAM BANK 
+;	AND THE FLASH CHIP IS SWITCHED INTO THE LOWER BANK.
+;
+;	INSPIRED BY WILL SOWERBUTTS FLASH4 UTILITY - https://github.com/willsowerbutts/flash4/
+;
+FF_INIT:
+	CALL	NEWLINE			; FORMATTING
+	PRTS("FF: FLASH ID:$")
+;
+	LD	(FF_STACK),SP		; SAVE STACK
+	LD	HL,(FF_STACK)
+
+	LD	BC,FF_I_SZ		; CODE SIZE REQUIRED
+	CCF				; CREATE A RELOCATABLE
+	SBC	HL,BC			; CODE BUFFER IN THE
+	LD	SP,HL			; STACK AREA
+;
+	PUSH	HL			; SAVE THE EXECUTE ADDRESS
+	EX	DE,HL			; PUT EXECUTE / START ADDRESS IN DE
+	LD	HL,FF_IDENT		; COPY OUR RELOCATABLE
+	LDIR				; CODE TO THE BUFFER
+;
+	LD	A,(HB_CURBNK)		; WE ARE STARTING IN HB_CURBNK
+	LD	B,A			; WHICH IS THE RAM COPY OF THE BIOS
+	LD	A,BID_BOOT		; BID_BOOT IS ROM BANK 0
+;
+	POP	HL			; CALL OUR RELOCATABLE CODE
+	CALL	JPHL
+;
+	LD	HL,(FF_STACK)		; RESTORE ORIGINAL 
+	LD	SP,HL			; STACK POSITION
+;
+	LD	H,E
+	LD	L,D
+	CALL	PRTHEXWORDHL		; DISPLAY FLASH ID
+	CALL	PC_SPACE
+;
+	LD	HL,FF_TABLE		; SEARCH THROUGH THE FLASH
+	LD	BC,FF_T_CNT		; TABLE TO FIND A MATCH
+FF_NXT1:LD	A,(HL)
+	CP	D
+	JR	NZ,FF_NXT0		; FIRST BYTE DOES NOT MATCH
+;
+	INC	HL		
+	LD	A,(HL)
+	CP	E
+	DEC	HL
+	JR	NZ,FF_NXT0		; SECOND BYTE DOES NOT MATCH
+;
+	INC	HL
+	INC	HL
+	JR	FF_NXT2			; MATCH SO EXIT
+
+FF_NXT0:PUSH	BC			; WE DIDN'T MATCH SO POINT
+	LD	BC,17			; TO THE NEXT TABLE ENTRY
+	ADD	HL,BC
+	POP	BC
+;
+	LD	A,B			; CHECK IF WE REACHED THE
+	OR	C			; END OF THE TABLE
+	DEC	BC
+	JR	NZ,FF_NXT1		; NOT AT END YET
+;
+	LD	HL,FF_UNKNOWN		; WE REACHED THE END WITHOUT A MATCH
+;
+FF_NXT2:CALL	PRTSTR			; AFTER SEARCH DISPLAY THE RESULT
+;
+	XOR	A			; INIT SUCCEEDED
+	RET
+;
+;======================================================================
+; IDENTIFY FLASH CHIP. THIS CODE IS RELOCATED AND EXECUTED IN THE STACK.
+; IT SWITCHES THE BOTTOM BANK TO ROM BANK 0 I.E. BOTTOM OF CHIP ADDRESS RANGE.
+; RETURNS WITH CHIP ID IN DE AND RETURNS THE BOTTOM BANK TO INITIAL STATE.
+;======================================================================
+;
+FF_IDENT:				; FLASH ROM ID CODE			``
+	HB_DI
+	CALL	HBX_BNKSEL		; SELECT ROM BANK 0
+;
+	LD	A,$AA			; SET IDENTIFY MODE
+	LD	($5555),A
+;
+	LD	A,$55
+	LD	($2AAA),A
+;
+	LD	A,$90
+	LD	($5555),A
+;
+	LD	DE,($0000)
+;
+	LD	A,$F0			; EXIT IDENTIFY MODE
+	LD	($5555),A
+;
+	LD	A,B			; RETURN TO ORIGINAL BANK
+	CALL	HBX_BNKSEL		; WHICH IS OUR RAM BIOS COPY
+	HB_EI
+;
+	RET
+;
+FF_I_SZ	.EQU	$-FF_IDENT
+;
+;	FLASH STYLE
+;
+ST_NORMAL	.EQU	0
+ST_ERASE_CHIP	.EQU	1
+ST_PROGRAM_SECT	.EQU	2
+;
+; FLASH CHIP MACRO
+;
+#DEFINE	FF_CHIP(FFROMID,FFROMNM,FFROMSS,FFROMMD) 	\
+#DEFCONT ;						\
+#DEFCONT	.DW	FFROMID				\
+#DEFCONT	.DB	FFROMNM				\
+#DEFCONT	.DW	FFROMSS				\
+#DEFCONT	.DW	FFROMMD				\
+#DEFCONT ;
+;
+; FLASH CHIP LIST
+;
+FF_TABLE:
+FF_CHIP(00120H,"29F010$    ",128,ST_NORMAL)
+FF_CHIP(001A4H,"29F040$    ",512,ST_NORMAL)
+FF_CHIP(01F04H,"AT49F001NT$",1024,ST_ERASE_CHIP)
+FF_CHIP(01F05H,"AT49F001N$ ",1024,ST_ERASE_CHIP)
+FF_CHIP(01F07H,"AT49F002N$ ",2048,ST_ERASE_CHIP)
+FF_CHIP(01F08H,"AT49F002NT$",2048,ST_ERASE_CHIP)
+FF_CHIP(01F13H,"AT49F040$  ",4096,ST_ERASE_CHIP)
+FF_CHIP(01F5DH,"AT29C512$  ",1,ST_PROGRAM_SECT)
+FF_CHIP(01FA4H,"AT29C040$  ",2,ST_PROGRAM_SECT)
+FF_CHIP(01FD5H,"AT29C010$  ",1,ST_PROGRAM_SECT)
+FF_CHIP(01FDAH,"AT29C020$  ",2,ST_PROGRAM_SECT)
+FF_CHIP(02020H,"M29F010$   ",128,ST_PROGRAM_SECT)
+FF_CHIP(020E2H,"M29F040$   ",512,ST_NORMAL)
+FF_CHIP(0BFB5H,"39F010$    ",32,ST_NORMAL)
+FF_CHIP(0BFB6H,"39F020$    ",32,ST_NORMAL)
+FF_CHIP(0BFB7H,"39F040$    ",32,ST_NORMAL)
+FF_CHIP(0C2A4H,"MX29F040$  ",512,ST_NORMAL)
+;
+FF_T_CNT	.EQU	($-FF_TABLE) / 17
+FF_UNKNOWN	.DB	"UNKNOWN$"
+FF_STACK:	.DW	0

Source/HBIOS/hbios.asm

@@ -1905,6 +1905,9 @@ HB_INITTBL:
 #IF (MDENABLE)
 	.DW	MD_INIT
 #ENDIF
+#IF (FFENABLE)
+	.DW	FF_INIT
+#ENDIF
 #IF (FDENABLE)
 	.DW	FD_INIT
 #ENDIF
@@ -3623,6 +3626,14 @@ SIZ_MD		.EQU	$ - ORG_MD
 		.ECHO	SIZ_MD
 		.ECHO	" bytes.\n"
 #ENDIF
+#IF (FFENABLE)
+ORG_FF		.EQU	$
+  #INCLUDE "flashfs.asm"
+SIZ_FF		.EQU	$ - ORG_FF
+		.ECHO	"FF occupies "
+		.ECHO	SIZ_FF
+		.ECHO	" bytes.\n"
+#ENDIF
 ;
 #IF (FDENABLE)
 ORG_FD		.EQU	$