FreeCalypso > hg > freecalypso-sw
view stashaway/mkcrc32tab.c @ 923:10b4bed10192
gsm-fw/L1: fix for the DSP patch corruption bug
The L1 code we got from the LoCosto fw contains a feature for DSP CPU load
measurement. This feature is a LoCosto-ism, i.e., not applicable to earlier
DBB chips (Calypso) with their respective earlier DSP ROMs. Most of the
code dealing with that feature is conditionalized as #if (DSP >= 38),
but one spot was missed, and the MCU code was writing into an API word
dealing with this feature. In TCS211 this DSP API word happens to be
used by the DSP code patch, hence that write was corrupting the patched
DSP code.
author | Mychaela Falconia <falcon@ivan.Harhan.ORG> |
---|---|
date | Mon, 19 Oct 2015 17:13:56 +0000 |
parents | 8fbd52a639a5 |
children |
line wrap: on
line source
/* * This program generates the CRC-32 table for the LSB-first direction. * Derived from the MSB-first version written years earlier by the * same author (Michael Spacefalcon) for SDSL/ATM AAL5. */ #include <sys/types.h> #include <stdio.h> u_long table[256]; main(argc, argv) char **argv; { build_table(); emit_table(); exit(0); } u_long crc_byte(crc, inb) u_long crc; int inb; { register int bit; crc ^= inb & 0xFF; for (bit = 0; bit < 8; bit++) { if (crc & 1) crc = (crc >> 1) ^ 0xEDB88320; else crc >>= 1; } return(crc); } build_table() { int i; for (i = 0; i < 256; i++) table[i] = crc_byte(0, i); } emit_table() { int i, j, idx; printf("unsigned long crc32_table[256] = {\n"); for (i = 0, idx = 0; i < 64; i++) { putchar('\t'); for (j = 0; j < 4; j++, idx++) printf("0x%08X,%c", table[idx], j==3 ? '\n' : ' '); } printf("};\n"); }