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liblitedram: discard singular 1s that are surrounded by 0s 

They are most likely glitches and won't be stable.

Signed-off-by: Maciej Dudek <mdudek@antmicro.com>
This commit is contained in:
Maciej Dudek 2023-01-25 11:38:13 +01:00 committed by Michal Sieron
parent cd89b62ff6
commit 3c02323cfe
1 changed files with 5 additions and 3 deletions
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8
litex/soc/software/liblitedram/sdram.c
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@ -415,7 +415,7 @@ static void sdram_leveling_center_module(
{
int i;
int show;
int working;
int working, last_working;
unsigned int errors;
int delay, delay_mid, delay_range;
int delay_min = -1, delay_max = -1, cur_delay_min = -1;
@ -425,9 +425,11 @@ static void sdram_leveling_center_module(
/* Find smallest working delay */
delay = 0;
working = 0;
rst_delay(module);
while(1) {
errors = run_test_pattern(module);
last_working = working;
working = errors == 0;
show = show_long;
#if SDRAM_PHY_DELAYS > 32
@ -435,8 +437,8 @@ static void sdram_leveling_center_module(
#endif
if (show)
print_scan_errors(errors);
if(working && delay_min < 0) {
delay_min = delay;
if(working && last_working && delay_min < 0) {
delay_min = delay - 1; // delay on edges can be spotty
break;
}
delay++;