[620] | 1 | ; Project name : XTIDE Universal BIOS Configurator v2
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| 2 | ; Description : Functions for flashing SST flash devices.
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| 3 |
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| 4 | ;
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[621] | 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2021 by XTIDE Universal BIOS Team.
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[620] | 7 | ;
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[621] | 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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[620] | 19 |
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| 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; FlashSst_WithFlashvarsInDSSI
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| 25 | ; Parameters:
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| 26 | ; DS:BX: Ptr to FLASHVARS
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| 27 | ; Returns:
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| 28 | ; Updated FLASHVARS in DS:BX
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| 29 | ; Corrupts registers:
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| 30 | ; AX, DX, DI
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| 31 | ;--------------------------------------------------------------------
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| 32 | ALIGN JUMP_ALIGN
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| 33 | FlashSst_WithFlashvarsInDSBX:
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| 34 | push ds
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| 35 | push es
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| 36 | push bx
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| 37 | push cx
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| 38 | push si
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| 39 | push bp
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[621] | 40 | mov bp, bx ; Flashvars now in SS:BP (Assumes SS=DS)
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[620] | 41 |
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| 42 | mov BYTE [bp+FLASHVARS.flashResult], FLASH_RESULT.DeviceNotDetected
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| 43 | call DetectSstDevice
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| 44 | jc SHORT .ExitOnError
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| 45 |
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| 46 | call CalibrateSstTimeout
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[621] | 47 |
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[620] | 48 | mov BYTE [bp+FLASHVARS.flashResult], FLASH_RESULT.PollingTimeoutError
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| 49 | mov cx, [bp+FLASHVARS.wPagesToFlash]
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[621] | 50 | mov dx, [bp+FLASHVARS.wEepromPageSize]
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| 51 | les di, [bp+FLASHVARS.fpNextSourcePage]
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| 52 | lds si, [bp+FLASHVARS.fpNextDestinationPage]
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[620] | 53 | %ifdef CLD_NEEDED
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| 54 | cld
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| 55 | %endif
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| 56 |
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| 57 | ALIGN JUMP_ALIGN
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| 58 | .NextPage:
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| 59 | ; See if this page needs updating.
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| 60 | push si
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| 61 | push di
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| 62 | push cx
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[621] | 63 | mov cx, dx
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[620] | 64 | repe cmpsb
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| 65 | pop cx
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| 66 | pop di
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| 67 | pop si
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[621] | 68 | jne SHORT .FlashThisPage
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| 69 | add si, dx
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| 70 | add di, dx
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[620] | 71 | jmp SHORT .ContinueLoop
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| 72 |
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| 73 | .FlashThisPage:
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| 74 | call EraseSstPage
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| 75 | jc SHORT .ExitOnError
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| 76 | call WriteSstPage
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| 77 | jc SHORT .ExitOnError
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| 78 | .ContinueLoop:
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| 79 | loop .NextPage
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| 80 |
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| 81 | ; The write process has already confirmed the results one byte at a time.
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[621] | 82 | ; Here we do an additional verify check just in case there was some
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[620] | 83 | ; kind of oddity with pages / addresses.
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| 84 | mov BYTE [bp+FLASHVARS.flashResult], FLASH_RESULT.DataVerifyError
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[621] | 85 | %ifndef USE_186
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[620] | 86 | mov ax, [bp+FLASHVARS.wPagesToFlash]
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[621] | 87 | mov cl, SST_PAGE_SIZE_SHIFT - 1 ; -1 because we compare WORDs (verifying 64 KB won't work otherwise)
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[620] | 88 | shl ax, cl
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[621] | 89 | xchg cx, ax
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| 90 | %else
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| 91 | mov cx, [bp+FLASHVARS.wPagesToFlash]
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| 92 | shl cx, SST_PAGE_SIZE_SHIFT - 1
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| 93 | %endif
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[620] | 94 | lds si, [bp+FLASHVARS.fpNextSourcePage]
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| 95 | les di, [bp+FLASHVARS.fpNextDestinationPage]
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[621] | 96 | repe cmpsw
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| 97 | jne SHORT .ExitOnError
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[620] | 98 |
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| 99 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
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| 100 | %if FLASH_RESULT.success = 0 ; Just in case this should ever change
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| 101 | mov [bp+FLASHVARS.flashResult], cl
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| 102 | %else
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| 103 | mov BYTE [bp+FLASHVARS.flashResult], FLASH_RESULT.success
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| 104 | %endif
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| 105 | %endif
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| 106 | ALIGN JUMP_ALIGN
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| 107 | .ExitOnError:
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| 108 | pop bp
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| 109 | pop si
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| 110 | pop cx
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| 111 | pop bx
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| 112 | pop es
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| 113 | pop ds
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| 114 | ret
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| 115 |
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| 116 | ;--------------------------------------------------------------------
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| 117 | ; DetectSstDevice
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| 118 | ; Parameters:
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| 119 | ; SS:BP: Ptr to FLASHVARS
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| 120 | ; Returns:
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| 121 | ; CF: Clear if supported SST device found
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| 122 | ; Set if supported SST device not found
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| 123 | ; Corrupts registers:
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[621] | 124 | ; AX, BX, SI, DS
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[620] | 125 | ;--------------------------------------------------------------------
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| 126 | ALIGN JUMP_ALIGN
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| 127 | DetectSstDevice:
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[621] | 128 | lds si, [bp+FLASHVARS.fpNextDestinationPage]
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| 129 | mov bx, 5555h
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[620] | 130 |
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| 131 | cli
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[621] | 132 | mov BYTE [bx], 0AAh ; Enter software ID sequence.
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| 133 | shr bx, 1 ; BX=2AAAh, CF=1
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| 134 | mov BYTE [bx], 55h
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| 135 | eRCL_IM bx, 1 ; BX=5555h
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| 136 | mov BYTE [bx], 90h
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| 137 | mov al, [si] ; Extra reads to be sure device
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| 138 | mov al, [si] ; has time to respond.
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| 139 | mov al, [si]
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| 140 | mov ah, [si] ; Vendor ID in AH.
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| 141 | mov al, [si+1] ; Device ID in AL.
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| 142 | mov BYTE [bx], 0F0h ; Exit software ID.
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[620] | 143 | sti
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| 144 |
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[621] | 145 | cmp ax, 0BFB4h
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[620] | 146 | jb SHORT .NotValidDevice
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[621] | 147 | cmp ax, 0BFB7h+1
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| 148 | cmc
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| 149 | .NotValidDevice:
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[620] | 150 | ret
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| 151 |
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| 152 | ;--------------------------------------------------------------------
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| 153 | ; CalibrateSstTimeout
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| 154 | ; Parameters:
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| 155 | ; SS:BP: Ptr to FLASHVARS
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| 156 | ; Returns:
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| 157 | ; FLASHVARS.wTimeoutCounter
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| 158 | ; Corrupts registers:
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| 159 | ; AX, BX, CX, SI, DI, DS, ES
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| 160 | ;--------------------------------------------------------------------
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| 161 | ALIGN JUMP_ALIGN
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| 162 | CalibrateSstTimeout:
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[621] | 163 | LOAD_BDA_SEGMENT_TO es, cx, !
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| 164 | mov ds, [bp+FLASHVARS.fpNextDestinationPage+2]
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| 165 | mov bx, BDA.dwTimerTicks
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[620] | 166 | mov si, cx
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| 167 | mov di, cx
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[621] | 168 | mov al, [di]
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| 169 | inc ax ; Forces poll to fail
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[620] | 170 |
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[621] | 171 | mov ah, [es:bx] ; Read low byte only
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| 172 | inc ah
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[620] | 173 | .WaitForFirstIncrement:
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[621] | 174 | cmp ah, [es:bx]
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| 175 | jne SHORT .WaitForFirstIncrement
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[620] | 176 |
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[621] | 177 | inc ah
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[620] | 178 |
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| 179 | .WaitForSecondIncrement:
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[621] | 180 | inc ch ; CX now 0x0100
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| 181 | .PollLoop: ; Identical to poll loop used
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| 182 | cmp [di], al ; during programming
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| 183 | loopne .PollLoop ; Will never be equal in this case
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| 184 | inc si ; Number of poll loops completed
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| 185 | jz SHORT .CountOverflow
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| 186 | cmp ah, [es:bx]
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| 187 | jne SHORT .WaitForSecondIncrement
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| 188 | SKIP1B al
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| 189 | .CountOverflow:
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[620] | 190 | ; Clamp on overflow, although it should not be possible on
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| 191 | ; real hardware. In principle SI could overflow on a very
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| 192 | ; fast CPU. However the SST device is on a slow bus. Even
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| 193 | ; running at the min read cycle time of fastest version of
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| 194 | ; the device, SI can not overflow.
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| 195 | dec si
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| 196 |
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[621] | 197 | ; SI ~= number of polling loops in 215us.
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| 198 | mov [bp+FLASHVARS.wTimeoutCounter], si
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| 199 | ret
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| 200 |
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[620] | 201 | ;--------------------------------------------------------------------
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| 202 | ; EraseSstPage
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| 203 | ; Parameters:
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[621] | 204 | ; DS:SI: Destination ptr
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[620] | 205 | ; Returns:
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| 206 | ; CF: Set on error.
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| 207 | ; Corrupts registers:
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[621] | 208 | ; AX, BX
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[620] | 209 | ;--------------------------------------------------------------------
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| 210 | ALIGN JUMP_ALIGN
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| 211 | EraseSstPage:
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| 212 | push cx
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| 213 |
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[621] | 214 | mov bx, 5555h
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| 215 | mov ax, 2AAAh
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[620] | 216 |
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[621] | 217 | ; Sector erase sequence.
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| 218 | mov [bx], al ; [5555h] <- AAh
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| 219 | xchg bx, ax
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| 220 | mov [bx], al ; [2AAAh] <- 55h
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| 221 | xchg bx, ax
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| 222 | mov BYTE [bx], 80h ; [5555h] <- 80h
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| 223 | mov [bx], al ; [5555h] <- AAh
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| 224 | xchg bx, ax
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| 225 | mov [bx], al ; [2AAAh] <- 55h
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| 226 | mov BYTE [si], 30h
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| 227 |
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| 228 | or bl, al ; BL = 0FFh
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[620] | 229 | mov ax, 1163 ; 1163 x ~215us = 250ms = 10x datasheet max
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| 230 | .TimeoutOuterLoop:
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| 231 | mov cx, [bp+FLASHVARS.wTimeoutCounter]
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| 232 | .TimeoutInnerLoop:
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[621] | 233 | cmp [si], bl ; Will return 0FFh when erase complete
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| 234 | loopne .TimeoutInnerLoop
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| 235 | je SHORT .Return
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[620] | 236 | dec ax
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| 237 | jnz SHORT .TimeoutOuterLoop
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[621] | 238 | ; Timed out (CF=1)
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| 239 | .Return:
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[620] | 240 | pop cx
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| 241 | ret
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| 242 |
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| 243 | ;--------------------------------------------------------------------
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| 244 | ; WriteSstPage
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| 245 | ; Parameters:
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[621] | 246 | ; DX: EEPROM page size
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| 247 | ; DS:SI: Destination ptr
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| 248 | ; ES:DI: Source ptr
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[620] | 249 | ; Returns:
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| 250 | ; SI, DI: Each advanced forward 1 page.
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| 251 | ; CF: Set on error.
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| 252 | ; Corrupts registers:
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[621] | 253 | ; AL, BX
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[620] | 254 | ;--------------------------------------------------------------------
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| 255 | ALIGN JUMP_ALIGN
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| 256 | WriteSstPage:
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| 257 | push cx
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[621] | 258 | push dx
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[620] | 259 |
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| 260 | mov bx, [bp+FLASHVARS.wTimeoutCounter]
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[621] | 261 | xchg si, di
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[620] | 262 | cli
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| 263 |
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| 264 | .NextByte:
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[621] | 265 | es lodsb ; Read byte from ES:SI
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| 266 | mov BYTE [5555h], 0AAh ; Byte program sequence.
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| 267 | mov BYTE [2AAAh], 55h
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| 268 | mov BYTE [5555h], 0A0h
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| 269 | mov [di], al ; Write byte to DS:DI
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[620] | 270 |
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| 271 | mov cx, bx
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| 272 | .WaitLoop:
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[621] | 273 | cmp [di], al ; Device won't return actual data until write complete.
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| 274 | loopne .WaitLoop ; Timeout ~215us, or ~10x 20us max program time from datasheet.
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| 275 | jne SHORT .WriteTimeout
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[620] | 276 |
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| 277 | inc di
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| 278 | dec dx
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| 279 | jnz SHORT .NextByte
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[621] | 280 | SKIP1B al
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| 281 | .WriteTimeout:
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| 282 | stc
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[620] | 283 | sti
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[621] | 284 | xchg si, di
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| 285 | pop dx
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[620] | 286 | pop cx
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| 287 | ret
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