| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Lo-tech XT-CFv2 board specifications.
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| 3 | ;
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| 4 | ; More information at http://www.lo-tech.co.uk/wiki/Lo-tech_XT-CFv2_Board
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| 5 |
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| 6 | ;
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| 7 | ; XTIDE Universal BIOS and Associated Tools
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| 8 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 9 | ;
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| 10 | ; This program is free software; you can redistribute it and/or modify
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| 11 | ; it under the terms of the GNU General Public License as published by
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| 12 | ; the Free Software Foundation; either version 2 of the License, or
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| 13 | ; (at your option) any later version.
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| 14 | ;
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| 15 | ; This program is distributed in the hope that it will be useful,
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| 16 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | ; GNU General Public License for more details.
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| 19 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 20 | ;
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| 21 |
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| 22 | %ifndef XTCF_INC
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| 23 | %define XTCF_INC
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| 24 |
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| 25 | DEFAULT_XTCF_SECTOR_WINDOW_SEGMENT EQU 0D800h
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| 26 |
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| 27 | ; XT-CF requires that block must be less than 128 sectors (64 kiB).
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| 28 | ; Instead of limiting block size to 64, we limit it to 32 (16 kiB).
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| 29 | ; Transferring more than 16 kiB with 8237 DMA controller block or demand
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| 30 | ; mode might interfere with DRAM refresh on XT systems.
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| 31 | XTCF_DMA_MODE_MAX_BLOCK_SIZE EQU 32 ; Sectors
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| 32 |
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| 33 | ; Possible base addresses. Note that all XT-CF IDE registers are SHL 1 compared
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| 34 | ; to standard IDE registers.
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| 35 | XTCF_BASE_PORT_DETECTION_SEED EQU 140h ; Not a valid base address but needed for autodetection
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| 36 | XTCF_BASE_PORT_1 EQU 200h
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| 37 | XTCF_BASE_PORT_2 EQU 240h
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| 38 | XTCF_BASE_PORT_3 EQU 300h ; Default setting
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| 39 | XTCF_BASE_PORT_4 EQU 340h
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| 40 |
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| 41 |
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| 42 | ; XT-CF Control Register (do not SHL 1 these!)
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| 43 | XTCF_CONTROL_REGISTER EQU 1Fh
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| 44 | XTCF_CONTROL_REGISTER_INVERTED_in EQU 1Eh
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| 45 |
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| 46 | ; Control Register contents:
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| 47 | ;
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| 48 | ; Control Register holds high byte from Sector Window segment if >= A0h
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| 49 | ; (First possible segment for Sector Window is A000h)
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| 50 | ;
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| 51 | ; 8-bit PIO transfers (port I/O) are used if Control Register is zero.
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| 52 | ; Any other value means DMA transfers (using DMA channel 3).
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| 53 | XTCF_8BIT_PIO_MODE EQU 0
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| 54 | XTCF_DMA_MODE EQU 10h
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| 55 | XTCF_MEMORY_MAPPED_MODE EQU 0A0h
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| 56 | RAISE_DRQ_AND_CLEAR_XTCF_XFER_COUNTER EQU 40h
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| 57 |
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| 58 |
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| 59 |
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| 60 | ; Subcommands for AH=1Eh, Lo-tech XT-CF features.
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| 61 | ; Return values common for all subcommands:
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| 62 | ; AH: RET_HD_SUCCESS if drive is XT-CF
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| 63 | ; RET_HD_INVALID if drive is not XT-CF
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| 64 | ; CF: 0 if successful, 1 if error
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| 65 |
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| 66 | ;--------------------------------------------------------------------
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| 67 | ; IS_THIS_DRIVE_XTCF
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| 68 | ; Parameters:
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| 69 | ; DL: Drive Number
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| 70 | ;--------------------------------------------------------------------
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| 71 | IS_THIS_DRIVE_XTCF EQU 0
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| 72 |
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| 73 | ;--------------------------------------------------------------------
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| 74 | ; READ_XTCF_CONTROL_REGISTER_TO_DH
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| 75 | ; Parameters:
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| 76 | ; DL: Drive Number
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| 77 | ; Returns:
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| 78 | ; DH: XT-CF Control Register contents
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| 79 | ;--------------------------------------------------------------------
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| 80 | READ_XTCF_CONTROL_REGISTER_TO_DH EQU 1
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| 81 |
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| 82 | ;--------------------------------------------------------------------
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| 83 | ; WRITE_DH_TO_XTCF_CONTROL_REGISTER
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| 84 | ; Parameters:
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| 85 | ; DH: Byte to write to XT-CF Control Register
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| 86 | ; DL: Drive Number
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| 87 | ;--------------------------------------------------------------------
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| 88 | WRITE_DH_TO_XTCF_CONTROL_REGISTER EQU 2
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| 89 |
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| 90 |
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| 91 | %endif ; XTCF_INC
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