topic Re: imx8m mini emmc boot in i.MX Processors

imx8m mini emmc boot

story — Thu, 09 May 2019 16:49:01 GMT

My chip imx8mmini, When I set up emmc boot, has the following problems:

U-Boot SPL 2018.03-imx_v2018.03_4.14.78_1.0.0_ga+g654088cc21 (May 09 2019 - 09:56:06 +0000)
power_bd71837_init
DRAM PHY training for 2400MTS
check ddr4_pmu_train_imem code
check ddr4_pmu_train_imem code pass
check ddr4_pmu_train_dmem code
check ddr4_pmu_train_dmem code pass
Training PASS
DRAM PHY training for 400MTS
check ddr4_pmu_train_imem code
check ddr4_pmu_train_imem code pass
check ddr4_pmu_train_dmem code
check ddr4_pmu_train_dmem code pass
Training PASS
DRAM PHY training for 100MTS
check ddr4_pmu_train_imem code
check ddr4_pmu_train_imem code pass
check ddr4_pmu_train_dmem code
check ddr4_pmu_train_dmem code pass
Training PASS
DRAM PHY training for 2400MTS
check ddr4_pmu_train_imem code
check ddr4_pmu_train_imem code pass
check ddr4_pmu_train_dmem code
check ddr4_pmu_train_dmem code pass
Training PASS
Normal Boot
Trying to boot from MMC2
MMC Device 1 not found
spl: could not find mmc device. error: -19
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

but,The emmc device can be detected in uboot mode and after the Linux system is booted.

Re: imx8m mini emmc boot

igorpadykov — Thu, 09 May 2019 23:41:56 GMT

Hi 扬杨

"MMC Device 1 not found" may mean poor signal integrity (noise) on

emmc lines, one can try to check signals with oscilloscope and use

logic analyzer. Signal shape can be improved uisng pad settings fuse option

0X490[31:24] USDHC pad setting override Table 6-19. USDHC boot
eFUSE descriptions i.MX8MMini Reference Manual
https://www.nxp.com/webapp/Download?colCode=IMX8MMRM

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: imx8m mini emmc boot

story — Fri, 10 May 2019 01:39:23 GMT

hi,

sd boot：

The emmc device can be detected in uboot mode and after the Linux system is booted.

linux（sd boot）：

uboot（sd boot）：

Does this mean that the hardware(emmc ) is normal.

may mean poor signal integrity (noise) on emmc lines ？？？？

The link you gave could not be found.

Re: imx8m mini emmc boot

igorpadykov — Fri, 10 May 2019 04:30:15 GMT

additionally one can recheck boot settings and try with latest Linux L4.14.98_1.0.0
linux-imx - i.MX Linux kernel

program emmc using uuu tool GitHub - NXPmicro/mfgtools: Freescale/NXP I.MX Chip image deploy tools.

follow Linux L4.14.98_2.0.0 Documentation

use uuu emmc programming example in

Linux Binary Demo Files - i.MX 8MMini EVK

Best regards
igor