bootrom.v

Verilog, c and asm source codes of the Minimig system, a fpga implementation of the Amiga computer.

// Copyright 2006, 2007 Dennis van Weeren
//
// This file is part of Minimig
//
// Minimig is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// Minimig is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
//
//
// This is the Minimig boot rom
// The bootrom contains code for early startup of the Minimig.
// The bootrom will download the kickstart rom image trough the floppy 
// interface to the kickstart ram area. 
//
// 11-04-2005	-removed rd signal because it is no longer necessary
// 19-04-2005	-expanded to 2Kbyte address space
// 21-12-2005	-added rd input
// 27-11-2006	-rom now implemented using blockram
//JB:
// 2008-05-14	-Verilog 2001 style module definition
// 2008-05-14	-new bootloader
 
module bootrom
(
	input 	clk,					//bus clock
	input 	aen,    				//rom enable
	input	rd,						//bus read
	input 	[10:1]address,		//address in
	output 	reg [15:0]dataout		//data out
);

reg	 	[10:1]romaddress;
reg		[15:0]romdata;

//use clocked address to infer blockram
always @(negedge clk)
	romaddress[10:1]<=address[10:1];

//the rom itself
//FPGA core version is stored in words 4-7 as 8 ASCII characters 
// bytes:
// 0-1: vendor id (YQ for JB :-)
// 2-3: year
// 4-5: month
// 6-7: day

//if all goes well this rom will be implemented using blockram
always @(romaddress)
begin
	case(romaddress)
		0000:	romdata[15:0] = 16'h0001;
		0001:	romdata[15:0] = 16'h0000;
		0002:	romdata[15:0] = 16'h0000;
		0003:	romdata[15:0] = 16'h0010;
//		0004:	romdata[15:0] = 16'h5951;//vendor
//		0005:	romdata[15:0] = 16'h3038;//year
//		0006:	romdata[15:0] = 16'h3037;//month
//		0007:	romdata[15:0] = 16'h3239;//day		
		0004:	romdata[15:0] = 16'h4141;//vendor
		0005:	romdata[15:0] = 16'h3030;//year
		0006:	romdata[15:0] = 16'h3030;//month
		0007:	romdata[15:0] = 16'h3030;//day
		0008:	romdata[15:0] = 16'h4DF9;
		0009:	romdata[15:0] = 16'h00DF;
		0010:	romdata[15:0] = 16'hF000;
		0011:	romdata[15:0] = 16'h6100;
		0012:	romdata[15:0] = 16'h031C;
		0013:	romdata[15:0] = 16'h3D7C;
		0014:	romdata[15:0] = 16'h9000;
		0015:	romdata[15:0] = 16'h0100;
		0016:	romdata[15:0] = 16'h3D7C;
		0017:	romdata[15:0] = 16'h0000;
		0018:	romdata[15:0] = 16'h0102;
		0019:	romdata[15:0] = 16'h3D7C;
		0020:	romdata[15:0] = 16'h0000;
		0021:	romdata[15:0] = 16'h0104;
		0022:	romdata[15:0] = 16'h3D7C;
		0023:	romdata[15:0] = 16'h0000;
		0024:	romdata[15:0] = 16'h0108;
		0025:	romdata[15:0] = 16'h3D7C;
		0026:	romdata[15:0] = 16'h0000;
		0027:	romdata[15:0] = 16'h010A;
		0028:	romdata[15:0] = 16'h3D7C;
		0029:	romdata[15:0] = 16'h003C;
		0030:	romdata[15:0] = 16'h0092;
		0031:	romdata[15:0] = 16'h3D7C;
		0032:	romdata[15:0] = 16'h00D4;
		0033:	romdata[15:0] = 16'h0094;
		0034:	romdata[15:0] = 16'h3D7C;
		0035:	romdata[15:0] = 16'h2C81;
		0036:	romdata[15:0] = 16'h008E;
		0037:	romdata[15:0] = 16'h3D7C;
		0038:	romdata[15:0] = 16'hF4C1;
		0039:	romdata[15:0] = 16'h0090;
		0040:	romdata[15:0] = 16'h3D7C;
		0041:	romdata[15:0] = 16'h037F;	//background colour
		0042:	romdata[15:0] = 16'h0180;
		0043:	romdata[15:0] = 16'h3D7C;
		0044:	romdata[15:0] = 16'h0FFF;	//text colour
		0045:	romdata[15:0] = 16'h0182;
		0046:	romdata[15:0] = 16'h41F9;
		0047:	romdata[15:0] = 16'h0000;
		0048:	romdata[15:0] = 16'h034E;
		0049:	romdata[15:0] = 16'h43F9;
		0050:	romdata[15:0] = 16'h0000;
		0051:	romdata[15:0] = 16'hC100;
		0052:	romdata[15:0] = 16'h7002;
		0053:	romdata[15:0] = 16'h22D8;
		0054:	romdata[15:0] = 16'h51C8;
		0055:	romdata[15:0] = 16'hFFFC;
		0056:	romdata[15:0] = 16'h2D7C;
		0057:	romdata[15:0] = 16'h0000;
		0058:	romdata[15:0] = 16'hC100;
		0059:	romdata[15:0] = 16'h0080;
		0060:	romdata[15:0] = 16'h3D40;
		0061:	romdata[15:0] = 16'h0088;
		0062:	romdata[15:0] = 16'h3D7C;
		0063:	romdata[15:0] = 16'h8390;
		0064:	romdata[15:0] = 16'h0096;
		0065:	romdata[15:0] = 16'h3D7C;
		0066:	romdata[15:0] = 16'h7FFF;
		0067:	romdata[15:0] = 16'h009E;
		0068:	romdata[15:0] = 16'h41F9;
		0069:	romdata[15:0] = 16'h0000;
		0070:	romdata[15:0] = 16'h035A;
		0071:	romdata[15:0] = 16'h6100;
		0072:	romdata[15:0] = 16'h027E;
		0073:	romdata[15:0] = 16'h41F9;
		0074:	romdata[15:0] = 16'h0000;
		0075:	romdata[15:0] = 16'h03AA;
		0076:	romdata[15:0] = 16'h6100;
		0077:	romdata[15:0] = 16'h0274;
		0078:	romdata[15:0] = 16'h41F9;
		0079:	romdata[15:0] = 16'h0000;
		0080:	romdata[15:0] = 16'h03C1;
		0081:	romdata[15:0] = 16'h6100;
		0082:	romdata[15:0] = 16'h026A;
		0083:	romdata[15:0] = 16'h45F9;
		0084:	romdata[15:0] = 16'h0000;
		0085:	romdata[15:0] = 16'h0008;
		0086:	romdata[15:0] = 16'h7E07;
		0087:	romdata[15:0] = 16'h101A;
		0088:	romdata[15:0] = 16'h6100;
		0089:	romdata[15:0] = 16'h0208;
		0090:	romdata[15:0] = 16'h51CF;
		0091:	romdata[15:0] = 16'hFFF8;
		0092:	romdata[15:0] = 16'h41F9;
		0093:	romdata[15:0] = 16'h0000;
		0094:	romdata[15:0] = 16'h03CE;
		0095:	romdata[15:0] = 16'h6100;
		0096:	romdata[15:0] = 16'h024E;
		0097:	romdata[15:0] = 16'h302E;
		0098:	romdata[15:0] = 16'h0004;
		0099:	romdata[15:0] = 16'hE048;
		0100:	romdata[15:0] = 16'h0200;
		0101:	romdata[15:0] = 16'h007F;
		0102:	romdata[15:0] = 16'h6100;
		0103:	romdata[15:0] = 16'h01CE;
		0104:	romdata[15:0] = 16'h41F9;
		0105:	romdata[15:0] = 16'h0000;
		0106:	romdata[15:0] = 16'h03DC;
		0107:	romdata[15:0] = 16'h0801;
		0108:	romdata[15:0] = 16'h0004;
		0109:	romdata[15:0] = 16'h6700;
		0110:	romdata[15:0] = 16'h0008;
		0111:	romdata[15:0] = 16'h41F9;
		0112:	romdata[15:0] = 16'h0000;
		0113:	romdata[15:0] = 16'h03E3;
		0114:	romdata[15:0] = 16'h6100;
		0115:	romdata[15:0] = 16'h0228;
		0116:	romdata[15:0] = 16'h41F9;
		0117:	romdata[15:0] = 16'h0000;
		0118:	romdata[15:0] = 16'h03EB;
		0119:	romdata[15:0] = 16'h6100;
		0120:	romdata[15:0] = 16'h021E;
		0121:	romdata[15:0] = 16'h302E;
		0122:	romdata[15:0] = 16'h007C;
		0123:	romdata[15:0] = 16'h6100;
		0124:	romdata[15:0] = 16'h01A4;
		0125:	romdata[15:0] = 16'h700A;
		0126:	romdata[15:0] = 16'h6100;
		0127:	romdata[15:0] = 16'h01BC;
		0128:	romdata[15:0] = 16'h700A;
		0129:	romdata[15:0] = 16'h6100;
		0130:	romdata[15:0] = 16'h01B6;
		0131:	romdata[15:0] = 16'h13FC;
		0132:	romdata[15:0] = 16'h0003;
		0133:	romdata[15:0] = 16'h00BF;
		0134:	romdata[15:0] = 16'hE201;
		0135:	romdata[15:0] = 16'h13FC;
		0136:	romdata[15:0] = 16'h0000;
		0137:	romdata[15:0] = 16'h00BF;
		0138:	romdata[15:0] = 16'hE001;
		0139:	romdata[15:0] = 16'h13FC;
		0140:	romdata[15:0] = 16'h00FF;
		0141:	romdata[15:0] = 16'h00BF;
		0142:	romdata[15:0] = 16'hD300;
		0143:	romdata[15:0] = 16'h13FC;
		0144:	romdata[15:0] = 16'h00F7;
		0145:	romdata[15:0] = 16'h00BF;
		0146:	romdata[15:0] = 16'hD100;
		0147:	romdata[15:0] = 16'h0839;
		0148:	romdata[15:0] = 16'h0002;
		0149:	romdata[15:0] = 16'h00BF;
		0150:	romdata[15:0] = 16'hE001;
		0151:	romdata[15:0] = 16'h6700;
		0152:	romdata[15:0] = 16'hFFF6;
		0153:	romdata[15:0] = 16'h303C;
		0154:	romdata[15:0] = 16'h000C;
		0155:	romdata[15:0] = 16'h6100;
		0156:	romdata[15:0] = 16'h0124;
		0157:	romdata[15:0] = 16'h207C;
		0158:	romdata[15:0] = 16'h0000;
		0159:	romdata[15:0] = 16'h4000;
		0160:	romdata[15:0] = 16'h0C58;
		0161:	romdata[15:0] = 16'hAA55;
		0162:	romdata[15:0] = 16'h6600;
		0163:	romdata[15:0] = 16'h00FE;
		0164:	romdata[15:0] = 16'h3018;
		0165:	romdata[15:0] = 16'h0C40;
		0166:	romdata[15:0] = 16'h0001;
		0167:	romdata[15:0] = 16'h6600;
		0168:	romdata[15:0] = 16'h001C;
		0169:	romdata[15:0] = 16'h2018;
		0170:	romdata[15:0] = 16'h6100;
		0171:	romdata[15:0] = 16'h0106;
		0172:	romdata[15:0] = 16'h41F9;
		0173:	romdata[15:0] = 16'h0000;
		0174:	romdata[15:0] = 16'h4000;
		0175:	romdata[15:0] = 16'h6100;
		0176:	romdata[15:0] = 16'h01AE;
		0177:	romdata[15:0] = 16'h700A;
		0178:	romdata[15:0] = 16'h6100;
		0179:	romdata[15:0] = 16'h0154;
		0180:	romdata[15:0] = 16'h6000;
		0181:	romdata[15:0] = 16'h00EE;
		0182:	romdata[15:0] = 16'h0C40;
		0183:	romdata[15:0] = 16'h0002;
		0184:	romdata[15:0] = 16'h6600;
		0185:	romdata[15:0] = 16'h009E;
		0186:	romdata[15:0] = 16'h2858;
		0187:	romdata[15:0] = 16'h2A4C;
		0188:	romdata[15:0] = 16'h2818;
		0189:	romdata[15:0] = 16'h2A04;
		0190:	romdata[15:0] = 16'h41F9;
		0191:	romdata[15:0] = 16'h0000;
		0192:	romdata[15:0] = 16'h03F9;
		0193:	romdata[15:0] = 16'h6100;
		0194:	romdata[15:0] = 16'h018A;
		0195:	romdata[15:0] = 16'h200C;
		0196:	romdata[15:0] = 16'h6100;
		0197:	romdata[15:0] = 16'h00FE;
		0198:	romdata[15:0] = 16'h41F9;
		0199:	romdata[15:0] = 16'h0000;
		0200:	romdata[15:0] = 16'h0408;
		0201:	romdata[15:0] = 16'h6100;
		0202:	romdata[15:0] = 16'h017A;
		0203:	romdata[15:0] = 16'h2004;
		0204:	romdata[15:0] = 16'h6100;
		0205:	romdata[15:0] = 16'h00EE;
		0206:	romdata[15:0] = 16'h700A;
		0207:	romdata[15:0] = 16'h6100;
		0208:	romdata[15:0] = 16'h011A;
		0209:	romdata[15:0] = 16'h41F9;
		0210:	romdata[15:0] = 16'h0000;
		0211:	romdata[15:0] = 16'h0412;
		0212:	romdata[15:0] = 16'h6100;
		0213:	romdata[15:0] = 16'h0164;
		0214:	romdata[15:0] = 16'h0442;
		0215:	romdata[15:0] = 16'h0021;
		0216:	romdata[15:0] = 16'h96FC;
		0217:	romdata[15:0] = 16'h0021;
		0218:	romdata[15:0] = 16'h2C05;
		0219:	romdata[15:0] = 16'hEA8E;
		0220:	romdata[15:0] = 16'hBC84;
		0221:	romdata[15:0] = 16'h6D00;
		0222:	romdata[15:0] = 16'h0004;
		0223:	romdata[15:0] = 16'h2C04;
		0224:	romdata[15:0] = 16'h3006;
		0225:	romdata[15:0] = 16'h6100;
		0226:	romdata[15:0] = 16'h0098;
		0227:	romdata[15:0] = 16'h3006;
		0228:	romdata[15:0] = 16'hE448;
		0229:	romdata[15:0] = 16'h5340;
		0230:	romdata[15:0] = 16'h28D8;
		0231:	romdata[15:0] = 16'h51C8;
		0232:	romdata[15:0] = 16'hFFFC;
		0233:	romdata[15:0] = 16'h707F;
		0234:	romdata[15:0] = 16'h6100;
		0235:	romdata[15:0] = 16'h00E4;
		0236:	romdata[15:0] = 16'h0879;
		0237:	romdata[15:0] = 16'h0001;
		0238:	romdata[15:0] = 16'h00BF;
		0239:	romdata[15:0] = 16'hE001;
		0240:	romdata[15:0] = 16'h9886;
		0241:	romdata[15:0] = 16'h6E00;
		0242:	romdata[15:0] = 16'hFFD0;
		0243:	romdata[15:0] = 16'hBBFC;
		0244:	romdata[15:0] = 16'h00F8;
		0245:	romdata[15:0] = 16'h0000;
		0246:	romdata[15:0] = 16'h6600;
		0247:	romdata[15:0] = 16'h0018;
		0248:	romdata[15:0] = 16'h0C85;
		0249:	romdata[15:0] = 16'h0004;
		0250:	romdata[15:0] = 16'h0000;
		0251:	romdata[15:0] = 16'h6600;
		0252:	romdata[15:0] = 16'h000E;
		0253:	romdata[15:0] = 16'h284D;
		0254:	romdata[15:0] = 16'hD9C5;
		0255:	romdata[15:0] = 16'h7AFF;
		0256:	romdata[15:0] = 16'h28DD;
		0257:	romdata[15:0] = 16'h51CD;
		0258:	romdata[15:0] = 16'hFFFC;
		0259:	romdata[15:0] = 16'h700A;
		0260:	romdata[15:0] = 16'h6100;
		0261:	romdata[15:0] = 16'h00B0;
		0262:	romdata[15:0] = 16'h6000;
		0263:	romdata[15:0] = 16'h004A;
		0264:	romdata[15:0] = 16'h0C40;
		0265:	romdata[15:0] = 16'h0003;
		0266:	romdata[15:0] = 16'h6600;
		0267:	romdata[15:0] = 16'h0012;
		0268:	romdata[15:0] = 16'h08F9;
		0269:	romdata[15:0] = 16'h0001;
		0270:	romdata[15:0] = 16'h00BF;
		0271:	romdata[15:0] = 16'hE001;
		0272:	romdata[15:0] = 16'h4A39;
		0273:	romdata[15:0] = 16'h00BF;
		0274:	romdata[15:0] = 16'hC000;
		0275:	romdata[15:0] = 16'h60FE;
		0276:	romdata[15:0] = 16'h3E00;
		0277:	romdata[15:0] = 16'h3D7C;
		0278:	romdata[15:0] = 16'h0F00;
		0279:	romdata[15:0] = 16'h0180;
		0280:	romdata[15:0] = 16'h41F9;
		0281:	romdata[15:0] = 16'h0000;
		0282:	romdata[15:0] = 16'h0451;
		0283:	romdata[15:0] = 16'h6100;
		0284:	romdata[15:0] = 16'h00D6;
		0285:	romdata[15:0] = 16'h3007;
		0286:	romdata[15:0] = 16'h6100;
		0287:	romdata[15:0] = 16'h0054;
		0288:	romdata[15:0] = 16'h6000;
		0289:	romdata[15:0] = 16'hFFFE;
		0290:	romdata[15:0] = 16'h3D7C;
		0291:	romdata[15:0] = 16'h0F00;
		0292:	romdata[15:0] = 16'h0180;
		0293:	romdata[15:0] = 16'h41F9;
		0294:	romdata[15:0] = 16'h0000;
		0295:	romdata[15:0] = 16'h0435;
		0296:	romdata[15:0] = 16'h6100;
		0297:	romdata[15:0] = 16'h00BC;
		0298:	romdata[15:0] = 16'h6000;
		0299:	romdata[15:0] = 16'hFFEA;
		0300:	romdata[15:0] = 16'h6000;
		0301:	romdata[15:0] = 16'hFED8;
		0302:	romdata[15:0] = 16'h3D7C;