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icestorm
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Finished icebram

This commit is contained in:
Clifford Wolf 2016-05-15 00:37:45 +02:00
parent 2c553baeac
commit 8503d3edd1
2 changed files with 75 additions and 6 deletions
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74
icebram/icebram.cc
View File

@ -19,6 +19,8 @@
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <stdint.h>
#include <sys/time.h>
#include <map>
#include <vector>
@ -33,6 +35,14 @@ using std::string;
using std::ifstream;
using std::getline;
uint64_t x;
uint64_t xorshift64star(void) {
x ^= x >> 12; // a
x ^= x << 25; // b
x ^= x >> 27; // c
return x * UINT64_C(2685821657736338717);
}
void parse_hexfile_line(const char *filename, int linenr, vector<vector<bool>> &hexfile, string &line)
{
vector<int> digits;
@ -63,7 +73,17 @@ error:
void help(const char *cmd)
{
printf("\n");
printf("Usage: %s [options] from_hexfile to_hexfile \n", cmd);
printf("Usage: %s [options] <from_hexfile> <to_hexfile>\n", cmd);
printf(" %s [options] -g <width> <depth>\n", cmd);
printf("\n");
printf("Replace BRAM initialization data in a .asc file. This can be used\n");
printf("for example to replace firmware images without re-running synthesis\n");
printf("and place&route.\n");
printf("\n");
printf(" -g\n");
printf(" generate a hex file with random contents.\n");
printf(" use this to generate the hex file used during synthesis, then\n");
printf(" use the same file as <from_hexfile> later.\n");
printf("\n");
printf(" -v\n");
printf(" verbose output\n");
@ -74,20 +94,70 @@ void help(const char *cmd)
int main(int argc, char **argv)
{
bool verbose = false;
bool generate = false;
int opt;
while ((opt = getopt(argc, argv, "v")) != -1)
while ((opt = getopt(argc, argv, "vg")) != -1)
{
switch (opt)
{
case 'v':
verbose = true;
break;
case 'g':
generate = true;
break;
default:
help(argv[0]);
}
}
if (generate)
{
if (optind+2 != argc)
help(argv[0]);
int width = atoi(argv[optind]);
int depth = atoi(argv[optind+1]);
if (width <= 0 || width % 4 != 0) {
fprintf(stderr, "Hexfile width (%d bits) is not divisible by 4 or nonpositive!\n", width);
exit(1);
}
if (depth <= 0 || depth % 256 != 0) {
fprintf(stderr, "Hexfile number of words (%d) is not divisible by 256 or nonpositive!\n", depth);
exit(1);
}
x = uint64_t(getpid()) << 32;
x ^= uint64_t(depth) << 16;
x ^= uint64_t(width) << 10;
xorshift64star();
xorshift64star();
xorshift64star();
struct timeval tv;
gettimeofday(&tv, NULL);
x ^= uint64_t(tv.tv_sec) << 20;
x ^= uint64_t(tv.tv_usec);
xorshift64star();
xorshift64star();
xorshift64star();
for (int i = 0; i < depth; i++) {
for (int j = 0; j < width / 4; j++) {
int digit = xorshift64star() & 15;
std::cout << "0123456789abcdef"[digit];
}
std::cout << std::endl;
}
exit(1);
}
if (optind+2 != argc)
help(argv[0]);

7
icebram/makedemo.py
View File

@ -8,11 +8,10 @@ while True:
numrports = np.random.randint(1, 5)
if bram_width * bram_depth * numrports < 16*4096: break
bram_width = 16
bram_depth = 256
numrports = 1
with open("demo.v", "wt") as f:
print("// bram_width = %d" % bram_width, file=f)
print("// bram_depth = %d" % bram_depth, file=f)
print("// numrports = %d" % numrports, file=f)
print("module demo (", file=f)
for i in range(numrports):
print(" input [%d:0] raddr%d," % (np.ceil(np.log2(bram_depth))-1, i), file=f)