Hi Francesco, On Fri, Dec 3, 2021 at 5:47 AM Francesco Dolcini <francesco.dolc...@toradex.com> wrote:
> I think that this applies even with just one chip select, it is just > prescribing a procedure and explicitly saying that it must be done for > all the chip select in use, either 1 or 2. According to the NXP application note: https://www.voipac.com/downloads/imx/test/nxp_doc/AN/AN4467_DDR_Calibration.pdf "To issue a Precharge-All to CS0, write 0x04000050 to MDSCR." but such setting is not done in NXP U-Boot for mx6sabresd: https://source.codeaurora.org/external/imx/uboot-imx/tree/board/freescale/mx6sabresd/mx6q_4x_mt41j128.cfg?h=lf_v2021.04 Back to your original instability issue: I suppose you are talking about colibri_imx6.c. Does it work well if you convert it to the mx6_dram_cfg() scheme?
