Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)

dhruvinrajpura — Tue, 11 Mar 2025 13:23:47 GMT

I am using custom board having imx8ulp with LPDDR4X(NE6F8FKAPAXAI)

For bring up purpose to configure RAM with MPU I downloaded RPA XLS and DDR Tool from below
ddr-tool-imx8ulp

First I generated ds file and load ds file directly to DDR tool and tried to calibrate but got error
ERROR: Check Data Bit Mapping,

So, I was trying some ways and once I changed cell "C12" below, earlier it was "3" i made it "1" instead(only single change in whole xls and worked)

Screenshot from 2025-03-11 18-35-25.png

After that I was able to calibrate it successfully and generated lpddr timing file updated in u-boot and generated u-boot.bin and u-boot-spl.bin made image and flashed.

Now issue I am getting is with above changes, while flashing and booting I required take multiple trials for both(flash&boot) and if I check A core logs,

In the trials which are not successful getting below logs and stuck after below logs everytime

On the successful trial I am getting below logs

U-Boot SPL 2022.04-dirty (Jan 08 2025 - 12:15:06 +0530) Normal Boot ELE firmware version 1.0.0-344acb84 upower_apd_inst_isr: entry upower_init: soc_id=48 upower_init: version:11.11.13 upower_init: start uPower RAM service user_upwr_rdy_callb: soc=b user_upwr_rdy_callb: RAM version:12.17 Turning on switches... Turn on switches ok Turning on memories... Turn on memories ok Clearing DDR retention... Clear DDR retention ok SEC0: RNG instantiated Trying to boot from BOOTROM Boot Stage: USB boot Find img info 0x&88000000, size 288 Download 943104, Total size 944128 NOTICE: BL31: v2.8(release):lf-6.6.3-1.0.0-0-g8dbe28631 NOTICE: BL31: Built : 17:57:56, Jan 22 2024 NOTICE: upower_init: start uPower RAM service NOTICE: user_upwr_rdy_callb: soc=b NOTICE: user_upwr_rdy_callb: RAM version:12.17 U-Boot 2022.04-dirty (Jan 08 2025 - 12:15:06 +0530) M33 Sync: OK CPU: i.MX8ULP rev1.2 at 960 MHz CPU current temperature: 35 Reset cause: POR Boot mode: Single boot Model: NXP i.MX8ULP 9X9 EVK DRAM: 2 GiB Core: 47 devices, 24 uclasses, devicetree: separate MMC: FSL_SDHC: 0 Loading Environment from nowhere... OK [*]-Video Link 0 (720 x 1280) [0] display-controller@2e050000, video [1] dsi@2db00000, video_bridge [2] panel@0, panel In: serial Out: serial Err: serial SEC0: RNG instantiated switch to partitions #0, OK mmc0(part 0) is current device UID 0x3baf2bda,0xb74e39fc,0xc40c9992,0xb364aa92 Detect USB boot. Will enter fastboot mode! Net: Fastboot: Normal Boot from USB for mfgtools *** Warning - Use default environment for mfgtools , using default environment Run bootcmd_mfg: run mfgtool_args;if iminfo ${initrd_addr}; then if test ${tee} = yes; then bootm ${tee_addr} ${initrd_addr} ${fdt_addr}; else booti ${loadaddr} ${initrd_addr} ${fdt_addr}; fi; else echo ; Hit any key to stop autoboot: 0 ## Checking Image at 83800000 ... Unknown image format! Run fastboot ... auto usb 0 UID 0x3baf2bda,0xb74e39fc,0xc40c9992,0xb364aa92 Detect USB boot. Will enter fastboot mode! flash target is MMC:0 Detect USB boot. Will enter fastboot mode! switch to partitions #0, OK mmc0(part 0) is current device Detect USB boot. Will enter fastboot mode!

So, For successful power up it requires almost 7-10 power cycles, As per my logs and DDR xls change what can be reason for above issue??

Re: Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)

JosephAtNXP — Tue, 11 Mar 2025 19:32:42 GMT

Hi,

Thank you for your interest in NXP Semiconductor products,

Seems like your timing is bootable under a limited amount of trials, could you confirm that you have your timings ok in your custom board? Please refer to chapter Step 6) Generate timing file.

If it still fail could you attach your read/write eye diagrams?

Regards

Re: Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)

dhruvinrajpura — Thu, 13 Mar 2025 05:25:17 GMT

Hi @JosephAtNXP

I followed step6 generated timing file, added that timing file in custom u-boot and generated u-boot.bin and u-boot-spl.bin and generated flash.bin from that only,

Here I am attaching read/write eye diagram test images.

Re: Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)

JosephAtNXP — Thu, 13 Mar 2025 19:59:56 GMT

Hi,

You should use that timing in a new U-boot and try again to boot the board,

Regards,

Re: Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)

dhruvinrajpura — Mon, 17 Mar 2025 09:41:26 GMT

Hi @JosephAtNXP

Currently I am using that timing file only and u-boot and getting issue that I explained.

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Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)

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Re: Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)

Re: Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)

Re: Unable to boot imx8ulp with LPDDR4x(NE6F8FKAPAXAI)