Hi everyone, I'm new to this list. I'd like to talk about some
difficulties I'm having with the ZPU core, is this the right place ?

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\_____ | \ o \ Adam Pierce / o / | _____/
\___ | \ o \________________________/ o / | ___/
\__|____\ o www.doctort.org/adam o /____|__/
\__\____________________________/__/
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Here or http://mail.zylin.com/mailman/listinfo/zylin-zpu_zylin.com is fine. -- Øyvind Harboe http://www.zylin.com - eCos ARM & FPGA developer kit

I want to know if the ZPU instruction set is documented anywhere. I
managed to synthesize the core and have compiled a very simple test
program but I cannot get it to run. If I understood a little more about
what the opcodes did, I could figure out what I am doing wrong. Maybe
this is an endian-ness issue but I can't tell.

Here is my simple example. I am running Cygwin on Windows XP.

$ cat looptest.c
// Dead simple test program
main()
{
while(1)
;
}

$ zpu-elf-gcc -o looptest.elf looptest.c -nostartfiles
/home/Adam/zpu/bin/../lib/gcc/zpu-elf/3.4.2/../../../../zpu-elf/bin/ld: warning:
cannot find entry symbol _start; defaulting to 00000000

$ zpu-elf-objcopy -O binary looptest.elf looptest.bin

$ hexdump looptest.bin
0000000 088c 8c02 0b0c 0b0b fb0b 0039
000000b

$ java -classpath zpu/simulator/zpusim.jar com.zylin.zpu.simulator.tools.MakeRam looptest.bin
0 => x"8c08028c",
1 => x"0c0b0b0b",



Øyvind Harboe wrote:
Here or http://mail.zylin.com/mailman/listinfo/zylin-zpu_zylin.com is fine.

I've got another step further, I noticed that the Java "MakeRam" utility tends to leave a few bytes off the end. I'm not much of a Java person so I re-wrote it in C. Here it is. You could include it in the ZPU CVS if you think it useful. My code unfortunately still doesn't run. // zpuromgen.c // // Program to turn a binary file into a VHDL lookup table. // by Adam Pierce // 29-Feb-2008 // // This software is free to use by anyone for any purpose. // #include #include typedef uint8_t BYTE; main(int argc, char **argv) { BYTE opcode[4]; int fd; int addr = 0; ssize_t s; // Check the user has given us an input file. if(argc \n\n", argv[0]); return 1; } // Open the input file. fd = open(argv[1], 0); if(fd == -1) { perror("File Open"); return 2; } while(1) { // Read 32 bits. s = read(fd, opcode, 4); if(s == -1) { perror("File read"); return 3; } if(s == 0) break; // End of file. // Output to STDOUT. printf("%6d => x\"%02x%02x%02x%02x\",\n", addr++, opcode[0], opcode[1], opcode[2], opcode[3]); } close(fd); return 0; } -- __ __ _______ __/ \____________________________/ \__ _______ \_____ | \ o \ Adam Pierce / o / | _____/ \___ | \ o \________________________/ o / | ___/ \__|____\ o www.doctort.org/adam o /____|__/ \__\____________________________/__/ ~~~~~~~\____________/~~~~~~~ \______/ \/