Hardware
/
litex
mirror of https://github.com/enjoy-digital/litex.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

bios/sdram: revert capability to do manual read leveling since still needed with some targets

This commit is contained in:
Florent Kermarrec 2018-01-08 12:04:33 +01:00
parent 03eb137449
commit 5681a3c1a9
1 changed files with 28 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
litex/soc/software/bios/sdram.c
View File

@ -598,7 +598,33 @@ int memtest(void)
}
#ifdef CSR_DDRPHY_BASE
int sdrlevel(void)
#ifdef READ_LEVELING_BITSLIP
int sdrlevel(void) /* manual */
{
int bitslip, delay, module;
int i;
sdram_dfii_control_write(DFII_CONTROL_SEL);
for(module=0; module<8; module++) {
ddrphy_dly_sel_write(1<<module);
ddrphy_rdly_dq_rst_write(1);
/* configure bitslip */
#ifdef KUSDDRPHY
ddrphy_rdly_dq_bitslip_write(1);
#else
for(bitslip=0; bitslip<READ_LEVELING_BITSLIP; bitslip++) {
// 7-series SERDES in DDR mode needs 3 pulses for 1 bitslip
for(i=0; i<3; i++)
ddrphy_rdly_dq_bitslip_write(1);
}
#endif
/* configure delay */
for(delay=0; delay<READ_LEVELING_DELAY; delay++)
ddrphy_rdly_dq_inc_write(1);
}
return 1;
}
#else
int sdrlevel(void) /* automatic */
{
int delay[DFII_PIX_DATA_SIZE/2];
int high_skew[DFII_PIX_DATA_SIZE/2];
@ -619,6 +645,7 @@ int sdrlevel(void)
return 1;
}
#endif
#endif
int sdrinit(void)
{