Honored Contributor
Honored ContributorHi Trey,
> What comes right after the configuration data? The .elf or the .sof? When I refer to the "configuration data", I'm talking about the data contained in the sof (or pof) that is used to program the FPGA (the logic you're downloading). This data is contained in a data "packet" within the pof/sof file and ends up getting programmed starting at offset zero in the epcs device. The length of this data can be determined from header information contained in the data itself: Here's a snippet from the u-boot sources. Assume that the fist 128 bytes of the epcs memory were read into a buffer (buf), and that 'sz' is an 32-bit unsigned value. Also, assume that the bit-reversals have already been performed./* Search for the starting 0x6a which is followed by the
* 4-byte 'register' and 4-byte bit-count.
*/
p = buf;
while (p < buf + sizeof(buf)-8) {
if ( *p == 0x6a ) {
/* Point to bit count and extract */
p += 5;
sz = *p++;
sz |= *p++ << 8;
sz |= *p++ << 16;
sz |= *p++ << 24;
/* Convert to byte count */
sz += 7;
sz >>= 3;
break;
} else if (*p == 0xff) {
/* 0xff is ok ... just skip */
p++;
continue;
} else {
/* Not 0xff or 0x6a ... something's not
* right ... report 'unknown' (sz=0).
*/
break;
}
}
return (sz);
