Resolved! Setting Octospi free running clock mode
Anyone knows why in HAL_OSPI_Init(...) , Octospi free running clock has to be enabled after Octospi is enabled. Form stm32l5xx-hal_ospi.c, lines 404-411: /* Enable OctoSPI */ __HAL_OSPI_ENABLE(hospi); /* Enable free running clock if needed :...