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imx93 – USB Disconnect During UUU Serial Downloader Boot

Dear NXP Team,

We are currently debugging our i.MX93 custom board using the MIMX9352AVTXMAC processor. Our board uses LPDDR4 with a two-rank memory configuration.

We are trying to program the onboard eMMC using UUU (Universal Update Utility). The board is configured in Serial Downloader / USB boot mode.

The i.MX93 is detected correctly by UUU:

uuu -lsusb
uuu (Universal Update Utility) for nxp imx chips -- libuuu_1.5.243-10-g59c7638

Connected Known USB Devices
Path Chip Pro Vid Pid BcdVersion Serial_no
====================================================================
3:1 MX93 SDPS: 0x1FC9 0x014E 0x0001

We are using the following command to program the eMMC:

sudo uuu -v -b emmc_all \ imx-boot-imx93evk-sd.bin-flash_singleboot \ image-imx93evk-20260905081644.rootfs.wic.zst

UUU detects the i.MX93 and starts the SDPS boot command. However, immediately after starting the bootloader transfer, the USB connection is lost.

The relevant UUU log is:

uuu (Universal Update Utility) for nxp imx chips -- libuuu_1.5.243-10-g59c7638

Build in config:
Pctl Chip Vid Pid BcdVersion Serial_No
==================================================
SDPS: MX8QXP 0x1fc9 0x012f [0x0002..0xffff]
SDPS: MX8QM 0x1fc9 0x0129 [0x0002..0xffff]
SDPS: MX8DXL 0x1fc9 0x0147
SDPS: MX28 0x15a2 0x004f
SDPS: MX815 0x1fc9 0x013e
SDPS: MX865 0x1fc9 0x0146
SDPS: MX8ULP 0x1fc9 0x014a
SDPS: MX8ULP 0x1fc9 0x014b
SDPS: MX93 0x1fc9 0x014e
SDPS: MX91 0x1fc9 0x0159
SDPS: MX95 0x1fc9 0x015d
SDPS: MX95 0x1fc9 0x015c
SDPS: MX943 0x1fc9 0x0027
SDPS: MX952/IMX937 0x1fc9 0x0028
SDP: MX7D 0x15a2 0x0076
SDP: MX6Q 0x15a2 0x0054
SDP: MX6D 0x15a2 0x0061
SDP: MX6SL 0x15a2 0x0063
SDP: MX6SX 0x15a2 0x0071
SDP: MX6UL 0x15a2 0x007d
SDP: MX6ULL 0x15a2 0x0080
SDP: MX6SLL 0x1fc9 0x0128
SDP: MX7ULP 0x1fc9 0x0126
SDP: MXRT106X 0x1fc9 0x0135
SDP: MX8MM 0x1fc9 0x0134
SDP: MX8MQ 0x1fc9 0x012b
SDPU: SPL 0x0525 0xb4a4 [0x0000..0x04ff]
SDPV: SPL1 0x0525 0xb4a4 [0x0500..0x9998]
SDPV: SPL1 0x1fc9 0x0151 [0x0500..0x9998]
SDPU: SPL 0x0525 0xb4a4 [0x9999..0x9999]
SDPU: SPL 0x3016 0x1001 [0x0000..0x04ff]
SDPV: SPL1 0x3016 0x1001 [0x0500..0x9998]
FBK: 0x066f 0x9afe
FBK: 0x066f 0x9bff
FBK: 0x1fc9 0x0153
FB: 0x0525 0xa4a5
FB: 0x18d1 0x0d02
FB: 0x3016 0x0001
FB: 0x1fc9 0x0152
FB: 0x0483 0x0afb
FB: 0x1d6b 0x0104

Run built-in script:

uuu_version 1.4.149

# @_flash.bin | bootloader, which can extract from wic image
# @_image [_flash.bin] | wic image burn to emmc.

# This command will be run when i.MX6/7 i.MX8MM, i.MX8MQ
SDP: boot -f imx-boot-imx93evk-sd.bin-flash_singleboot -scanlimited 0x800000

# This command will be run when ROM support stream mode
# i.MX8QXP, i.MX8QM
SDPS: boot -scanterm -f imx-boot-imx93evk-sd.bin-flash_singleboot -scanlimited 0x800000

# These commands will be run when use SPL and will be skipped if no spl
# SDPU will be deprecated. please use SDPV instead of SDPU
# {
SDPU: delay 1000
SDPU: write -f imx-boot-imx93evk-sd.bin-flash_singleboot -offset 0x57c00
SDPU: jump -scanlimited 0x800000
# }

# These commands will be run when use SPL and will be skipped if no spl
# if (SPL support SDPV)
# {
SDPV: delay 1000
SDPV: write -f imx-boot-imx93evk-sd.bin-flash_singleboot -skipspl -scanterm -scanlimited 0x800000
SDPV: jump -scanlimited 0x800000
# }

FB: ucmd setenv fastboot_dev mmc
FB: ucmd setenv mmcdev ${emmc_dev}
FB: ucmd mmc dev ${emmc_dev}
FB: flash -raw2sparse all imx-boot-imx93evk-sd.bin-flash_singleboot
FB: flash -scanterm -scanlimited 0x800000 bootloader imx-boot-imx93evk-sd.bin-flash_singleboot
FB: ucmd if env exists emmc_ack; then ; else setenv emmc_ack 0; fi;
FB: ucmd mmc partconf ${emmc_dev} ${emmc_ack} 1 0
FB: done

Wait for Known USB Device Appear...
New USB Device Attached at 3:1-6A440AB426084436
3:1-6A440AB426084436>Start Cmd:SDPS: boot -scanterm -f imx-boot-imx93evk-sd.bin-flash_singleboot -scanlimited 0x800000
3%3:1-6A440AB426084436>Fail HID(W): LIBUSB_ERROR_NO_DEVICE (-4)(0.024s)

While sending the boot command, we also monitored the Linux USB messages using dmesg.

The i.MX93 USB device is disconnected and then enumerates again, refer the attached screenshot of the dmesg.

We would appreciate your guidance on the following questions:

Is this USB disconnect/re-enumeration expected during the i.MX93 SDPS bootloader handoff when using UUU?
What does the following error indicate in this specific situation? Fail HID(W): LIBUSB_ERROR_NO_DEVICE (-4)
Are there any specific requirements for the following signals during the SDPS-to-SPL/U-Boot handoff that we should verify on the custom board?
- POR_B
- RESET_B
- USB_VBUS
- USB_DP/DM
- Processor power rails
- LPDDR4 power rails
- System/reference clocks
Could you please provide a reference design, or software/boot configuration example for the i.MX93 MIMX9352AVTXMAC with a two-rank LPDDR4 memory configuration? In particular, we would like to confirm the recommended LPDDR4 device configuration, memory initialization/training configuration, and corresponding IMX_BOOT/SPL configuration for a two-rank memory design.

We would appreciate your guidance on the above issue and request you to provide the relevant details, recommended configuration, and reference design/code for the two-rank LPDDR4 configuration.

Thanks & Regards,

Abishek

Re: imx93 – USB Disconnect During UUU Serial Downloader Boot

Hi @pengyong_zhang ,

Please refer the attached LPDDR4 schematics and configuration .mex for your reference.

Regards,

Abishek

Re: imx93 – USB Disconnect During UUU Serial Downloader Boot

Hi @AbishekDevan

1. This is not the expected behavior.

2. This error occurred because the device disconnected during the flashing process. please share the customer's DDR schematic file and configuration page.

B.R

Re: imx93 – USB Disconnect During UUU Serial Downloader Boot

Hi @AbishekDevan

i cannot import your .mex file successfully. Please share a screenshot of your DDR configuration page.

B.R