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annotate 3rdparty/booters/boot_mmc.asm @ 1168:3be7fce1a56b

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Added Jim Hathaway's MMC booter, made other source changes
author boisy
date Mon, 19 May 2003 11:22:34 +0000
parents
children 481618f41f1d
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1168
3be7fce1a56b Added Jim Hathaway's MMC booter, made other source changes
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1 ********************************************************************
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2 * Boot - MMC Boot Module
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3 *
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4 * $Id$
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5 *
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6 * This module allows booting from MMC devices using Jim Hathaway's
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7 * MMC Interface for the Color Computer.
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8 *
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9 * This booter was created on May 17th, 2003 by Jim Hathaway and Boisy Pitre
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10 * at the 12th Annual "Last" Chicago CoCoFEST! in Elgin, Illinois at the
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11 * Cloud-9 booth.
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12 *
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13 * Ed. Comments Who YY/MM/DD
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14 * ------------------------------------------------------------------
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15 * 1 Created JH 03/05/17
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16
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17 nam Boot
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18 ttl MMC Boot Module
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19
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20 ifp1
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21 use defsfile
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22 endc
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23
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24 tylg set Systm+Objct
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25 atrv set ReEnt+rev
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26 rev set 2
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27 edition set 1
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28
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29 mod eom,name,tylg,atrv,start,size
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30
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31 blockloc rmb 2 pointer to memory requested
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32 blockimg rmb 2 duplicate of the above
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33 bootloc rmb 3 sector pointer; not byte pointer
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34 bootsize rmb 2 size in bytes
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35 size equ .
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36
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37 name fcs /Boot/
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38 fcb edition
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39
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40 start clra
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41 ldb #size
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42 clean pshs a
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43 decb
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44 bne clean
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45 tfr s,u get pointer to data area
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46 pshs u save pointer to data area
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47
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48 lda #$d0 forced interrupt; kill floppy activity
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49 sta $FF48 command register
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50
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51 clrb
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52 pause decb
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53 bne pause
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54 lda $FF48 clear controller
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55 clr $FF40 make sure motors are turned off
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56
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57 * Init hardware
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58 lbsr INITCRD
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59 bcs error
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60
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61 * Request memory for LSN0
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62 ldd #1
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63 os9 F$SRqMem request one page of RAM
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64 bcs error
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65 bsr getpntr
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66
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67 * Get LSN0 into memory
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68 clrb MSB sector
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69 ldx #0 LSW sector
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70 bsr mread
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71 bcs error
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72 ldd bootsize,u
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73 bcs error
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74 pshs d
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75
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76 * Return memory
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77 ldd #$100
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78 ldu blockloc,u
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79 os9 F$SRtMem
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80 puls d
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81 ifgt Level-1
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82 os9 F$BtMem
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83 else
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84 os9 F$SRqMem
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85 endc
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86 bcs error
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87 bsr getpntr
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88 std blockimg,u
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89
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90 * Get os9boot into memory
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91 ldd bootsize,u
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92 leas -2,s same as a PSHS D
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93 getboot std ,s
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94 ldb bootloc,u MSB sector location
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95 ldx bootloc+1,u LSW sector location
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96 bsr mread
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97 ldd bootloc+1,u update sector location by one to 24bit word
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98 addd #1
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99 std bootloc+1,u
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100 ldb bootloc,u
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101 adcb #0
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102 stb bootloc,u
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103 inc blockloc,u update memory pointer for upload
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104 ldd ,s update size of file left to read
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105 subd #$100 file read one sector at a time
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106 bhi getboot
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107
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108 leas 4+size,s reset the stack same as PULS U,D
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109 ldd bootsize,u
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110 ldx blockimg,u pointer to start of os9boot in memory
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111 andcc #^Carry clear carry
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112 rts back to os9p1
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113
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114 error leas 2+size,s
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115 rts
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116
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117 getpntr tfr u,d save pointer to requested memory
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118 ldu 2,s recover pointer to data stack
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119 std blockloc,u
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120 rts
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121
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122 mread tstb
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123 bne hwread
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124 cmpx #0
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125 bne hwread
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126 bsr hwread
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127 bcc readlsn0
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128 rts
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129
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130 readlsn0 pshs a,x,y
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131 ldy blockloc,u
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132 lda DD.Bt,y os9boot pointer
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133 ldx DD.Bt+1,y LSW of 24 bit address
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134 sta bootloc,u
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135 stx bootloc+1,u
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136 ldx DD.BSZ,y os9boot size in bytes
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137 stx bootsize,u
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138 clrb
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139 puls a,x,y,pc
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140
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141 * Generic read
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142 hwread pshs x
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143 lbsr READ
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144 puls x,pc
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145
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146
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147 CMDREAD equ $51 Command to read a single block
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148 MMCCSB equ $80 MMC control register slow clock bit
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149 MMCCRO equ 1 MMC control register offset from data port
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150 MMCDPR equ $FF7A MMC Data port register
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151
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152
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153
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154 ********************************
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155 * Command bytes storage area
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156 ********************************
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157 CMD0 fcb $40,0,0,0
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158 CMD1 fcb $41,0,0,0
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159 CMD171 fcb $50,0,0,1
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160
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161 ***************************************************************
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162 * Send a command string to the MMC (6 bytes) 4 user 2 hard code
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163 * Entry: y= Pointer to command string to send
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164 * x= MMC data register
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165 * b= Not used
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166 * a= Used to copy data
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167 ***************************************************************
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168 SNDC lda ,y Get cmd byte 1
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169 sta ,x Send command byte
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170 lbsr DLYSTRT Call our delay routine
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171 lda 1,y Get cmd byte 2
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172 sta ,x Send command byte
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173 lbsr DLYSTRT Call our delay routine
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174 lda 2,y Get cmd byte 3
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175 sta ,x Send command byte
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176 lbsr DLYSTRT Call our delay routine
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177 lda 3,y Get cmd byte 4
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178 sta ,x Send command byte
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179 lbsr DLYSTRT Call our delay routine
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180 lda #0 Get cmd byte 5
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181 sta ,x Send command byte
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182 lbsr DLYSTRT Call our delay routine
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183 lda #$95 Get cmd byte 6
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184 sta ,x Send command byte
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185 lbsr DLYSTRT Call our delay routine
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186 rts Complete sending command return
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187
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188 ***********************************************************
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189 * CHKR - Check card response
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190 * Used to check response from a card
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191 * Entry: a= Expected Response byte code
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192 * b= used for loop / set on exit to flag error/no error
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193 ***********************************************************
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194 CHKR pshs b Save reg b
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195 clrb Use for loop counter
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196 CHKRL1 bsr DLYSTRT Call our delay routine
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197 cmpa ,x Check for response
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198 beq CHKRG Response is good, exit without error
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199 decb Keep looping?
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200 bne CHKRL1 Done yet?
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201 CHKRB comb Set error state
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202 puls b,pc Return
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203 CHKRG clrb Set no error
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204 puls b,pc Return
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205 * End CHKR routine
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206
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207 *********************************************************************
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208 * DLYSTRT: Delay routine for use as a delay for sending commands
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209 * or clock pulses as the slower spi rate.
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210 * Delay is hard coded at $14
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211 * All registers perserved
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212 *********************************************************************
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213 DLYSTRT pshs b Save b register for return
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214 ldb #$14 Default delay needed
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215 DLYLP1 decb Start of delay loop
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216 bne DLYLP1 End of delay loop
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217 puls b,pc Get value of b register back
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218 * End delay routine
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219
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220 ************************************************************
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221 * INITCRD: Init a single card, no register values needed,
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222 * all preserved
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223 * Entry: y = Used, and not preserved
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224 * x = Address to MMC data port
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225 ************************************************************
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226 INITCRD ldx #MMCDPR Address to MMC
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227 lda #MMCCSB Select no cards and slow speed
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228 sta MMCCRO,x Store to control register
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229 lda #$0A A= 10 clocks
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230 CLKPL1 tst ,x Pulse the clock 80 times to init all cards
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231 bsr DLYSTRT Call our delay routine
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232 deca Loop counter
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233 bne CLKPL1 Keep looping till we send 80 clocks
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234
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235 lda #$81 Select crd 1 @ slow speed
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236 sta MMCCRO,x Write to MMC control register slow speed
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237 leay CMD0,pcr Load address into y for cmd0
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238 lbsr SNDC Go send the command (cmd0)
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239
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240 lda #$01 Expected response
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241 lbsr CHKR Go check for response bit
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242 lbcs INITCE1
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243
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244 ldb #20 Number of times to send CMD1 before error
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245
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246 leay CMD1,pcr Load address into y for cmd1
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247 INCMD1L lbsr SNDC Go send the command (cmd1)
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248
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249 lda #$00 Expected response
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250 lbsr CHKR Go check for response bit
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251 bcc INC1C We got our response, continue
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252
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253 decb Loop counter
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254 bne INCMD1L Keep trying to get a response of 0
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255 lbcc INC1C
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256 lda #81
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257 lbra INITCE1 This card is not ready exit
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258
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259 INC1C lda #$01 Get card number, always use card 0
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260 sta MMCCRO,x Write to MMC control register full speed
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261 leay CMD171,pcr Get command to change sector to 256 bytes
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262 lbsr SNDC Go send the command (cmd17-1)
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263
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264 lda #0 Expected response
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265 lbsr CHKR Go check for response byte
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266 bcs INITCE1
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267
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268 clrb No error
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269 puls pc Clean exit
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270
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271 INITCE1 comb Error, we could not init card
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272 tfr a,b
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273 puls pc
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274 * End of INITCRD
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275
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276 *****************************************************************
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277 * READ - Read a single 256 byte sector.
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278 * y= Location to store data to
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279 * b,x= LSN number
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280 * x not preserved
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281 *****************************************************************
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282 READ pshs d,x Save LSN
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283 ldy blockloc,u
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284 lda #$1 Get drive #1
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285 sta MMCCRO+MMCDPR Select card 1
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286 lda MMCDPR Burn a byte - bug fix
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287
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288 lda #CMDREAD Read cmd byte 1
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289 sta MMCDPR Save read command
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290 nop Delay
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291 stb MMCDPR Save cmd byte 2
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292 tfr x,d Move the rest of the LSN
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293 sta MMCDPR Save cmd byte 3
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294 ldx #MMCDPR Get MMC address and delay
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295 stb ,x Save cmd byte 4
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296 lda #$0 Cmd byte 5
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297 sta ,x Save cmd byte 5
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298 lda #$95 Cmd byte 6 CRC
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299 sta ,x Save cmd byte 6
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300
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301 RDN2 lda #$FE Expected response
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302 lbsr CHKR Check for response
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303 bcs RDEEX1 Card should have read sector, read error!
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304
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305 clra Number of loops 256
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306 RDLP1 ldb ,x Get byte from MMC
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307 stb ,y+ Save byte
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308 deca Loop counter
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309 bne RDLP1
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310
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311 ldd ,x Get CRC Byte 1
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312 lda ,x Get CRC Byte 2
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313
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314 RDEX1 clr MMCCRO,x Deselect any cards in use
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315 clrb Set no errors
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316 puls d,x,pc Read complete with no errors
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317 RDEEX1 clr MMCCRO,x Deselect any cards in use
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318 comb Error reading sector
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319 puls d,x,pc Return with error
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320 * End of READ
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321
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322
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323 ifgt Level-1
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324 * Fillers to get to $1D0
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325 Pad fill $39,$1D0-3-*
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326 endc
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327
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328 emod
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329 eom equ *
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330 end
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331