Artesyn MVME5100, Programmer'S Reference Manual, Page: 305 / 318

MVME5100 VPD Reference Information
MVME5100 Single Board Computer Programmer’s Reference (6806800H17B)
305
unsigned int
srom_crc(elements_p, elements_n)
register unsigned char *elements_p; /* buffer pointer */
register unsigned int elements_n; /* number of elements */
{
register unsigned int crc;
register unsigned int crc_flipped;
register unsigned char cbyte;
register unsigned int index, dbit, msb;
crc = 0xffffffff;
for (index = 0; index < elements_n; index++) {
cbyte = *ele+;
for (dbit = 0; dbit < 8; dbit++) {
msb = (crc >> 31) & 1;
crc <<= 1;
if (msb ^ (cbyte & 1)) {
crc ^= 0x04c11db6;
crc |= 1;
}
cbyte >>= 1;
}
}
crc_flipped = 0;
for (index = 0; index < 32; index++) {
crc_flipped <<= 1;
dbit = crc & 1;
crc >>= 1;
crc_f= dbit;
}
crc = crc_flipped ^ 0xffffffff;
return (crc);
}
A.1.11.2 Configuration Checksum Calculation Code
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* cssect - checksum section
* description:
* This component's purpose is to checksum the buffer pointed to
* by the buffer pointer.
* notes:
* call:
* argument #1 = buffer (section) to checksum
* argument #2 = number of bytes in buffer
* return: