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software/liblitedram: Introduce SDRAM_PHY_DELAY_JUMP and set to 4 on 7-Series instead of 1 to improve calibration robustness on some boards.

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This is for example required on the STLV7325 board.
This commit is contained in:
Florent Kermarrec 2022-02-24 17:31:54 +01:00
parent 82daa48e09
commit f6d6611a81
1 changed files with 7 additions and 5 deletions
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12
litex/soc/software/liblitedram/sdram.c
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@ -398,14 +398,16 @@ static void sdram_leveling_center_module(
/* Get a bit further into the working zone */
#if SDRAM_PHY_DELAYS > 32
for(i=0;i<16;i++) {
#define SDRAM_PHY_DELAY_JUMP 16
#elif SDRAM_PHY_DELAYS > 8
#define SDRAM_PHY_DELAY_JUMP 4
#else
#define SDRAM_PHY_DELAY_JUMP 1
#endif
for(i=0;i<SDRAM_PHY_DELAY_JUMP;i++) {
delay += 1;
inc_delay(module);
}
#else
delay++;
inc_delay(module);
#endif
/* Find largest working delay */
while(1) {