I am tring to rebuild kenel for STM32MP157C-DK2 PC $> make ARCH=arm multi_v7_defconfig fragment*.config

[建胡.1]

[   1.825627] usbhid: USB HID core driver

[   1.833630] stm32-ddr-pmu: probed (ID=0x00140061 VER=0x00000010), DDR@533MHz

[   1.840775] optee: probing for conduit method from DT.

[   1.844463] optee: api uid mismatch

[   1.848396] NET: Registered protocol family 17

[   1.852418] can: controller area network core (rev 20170425 abi 9)

[   1.858764] NET: Registered protocol family 29

[   1.863049] can: raw protocol (rev 20170425)

[   1.867355] can: broadcast manager protocol (rev 20170425 t)

[   1.872999] can: netlink gateway (rev 20170425) max_hops=1

[   1.879164] Key type dns_resolver registered

[   1.882955] ThumbEE CPU extension supported.

[   1.887142] Registering SWP/SWPB emulation handler

[   1.892786] registered taskstats version 1

[   1.895937] Loading compiled-in X.509 certificates

[   1.925546] stm32-cpufreq stm32-cpufreq: Failed to get chip info: -517

[   1.932467] mmci-pl18x 58007000.sdmmc: allocated mmc-pwrseq

[   1.945772] stm32-cpufreq stm32-cpufreq: Failed to get chip info: -517

[   1.952638] mmci-pl18x 58007000.sdmmc: allocated mmc-pwrseq

[   1.958096] stm32_rtc 5c004000.rtc: setting system clock to 2000-01-01 00:34:37 UTC (946686877)

[   1.968214] Waiting for root device /dev/mmcblk0p6...

Waiting for root device /dev/mmcblk0p6...

[Olivier GALLIEN]

Hi,

Seems you are facing similar issue already answered in this post :

https://community.st.com/s/question/0D50X0000CCpjAgSQJ/after-rebuild-kernel-then-machine-stop-to-waiting-for-here-root-device-devmmcblk0p6

Please confirm or clarify further your build procedure.

Olivier