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bios/sdram: add ERR_DDRPH_BITSLIP constant and some cleanup

This commit is contained in:
Florent Kermarrec 2018-07-19 12:52:00 +02:00
parent 1564b440eb
commit df7e5dbcf6
1 changed files with 9 additions and 7 deletions
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16
litex/soc/software/bios/sdram.c
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@ -203,6 +203,7 @@ void sdrwr(char *startaddr)
#else
#define ERR_DDRPHY_DELAY 32
#endif
#define ERR_DDRPHY_BITSLIP 8
#ifdef CSR_DDRPHY_WLEVEL_EN_ADDR
@ -748,14 +749,15 @@ int sdrlevel(void)
return 0;
#endif
/* check for optimal read leveling window */
for(i=0; i<8; i++) {
if (read_level_scan(1)) {
for(i=0; i<ERR_DDRPHY_BITSLIP; i++) {
/* scan */
if (read_level_scan(1))
break;
} else {
/* else increment bitslip and re-scan */
for(j=0; j<DFII_PIX_DATA_SIZE/2; j++)
read_bitslip_inc(j);
}
if (i == ERR_DDRPHY_BITSLIP-1)
return 0;
/* increment bitslip */
for(j=0; j<DFII_PIX_DATA_SIZE/2; j++)
read_bitslip_inc(j);
}
/* show bitslip and scan */
printf("Read bitslip: %d\n", i);