Not able to access eMMC from u-boot on STM32MP157C device

[Pratik Manvar]

Hi STM-Team,

We have the custom board based on the STM32MP157C-Eval board.

In that, we are not able to access the eMMC from u-boot command prompt. Currently, we are booting from SD card and able to access it from u-boot command prompt.

We are able to see the 2 mmc devices but not able to access eMMC on dev-1. Please see below logs:

-----------------------------------------

STM32MP> mmc list

STM32 SD/MMC: 1

STM32 SD/MMC: 0 (SD)

STM32MP> mmc dev 0

switch to partitions #0, OK

mmc0 is current device

STM32MP> mmc dev 1

<No output from this command>

-------------------------------------------

But, with same configurations, we are able to access and create partitions of eMMC through fdisk command from filesystem command prompt. Also, see the below kernel boot-up logs:

-------------------------------------------

[  3.976158] mmc1: new DDR MMC card at address 0001

[  3.989649] mmcblk1: mmc1:0001 IB2916 14.6 GiB

[  3.994868] mmcblk1boot0: mmc1:0001 IB2916 partition 1 4.00 MiB

[  4.000048] mmcblk1boot1: mmc1:0001 IB2916 partition 2 4.00 MiB

[  4.016430] mmcblk1rpmb: mmc2:0001 IB2916 partition 3 4.00 MiB, chardev (243:0)

[  4.030124] mmcblk1: p1

--------------------------------------------

Please help us out why we are not able to access the eMMC from u-boot.

Thanks & Regards,

Pratik Manvar

[OlivierK]

Hi Pratik Manvar (Community Member)

Maybe your are already sorted out?

just in case did you follow this?

https://wiki.st.com/stm32mpu/wiki/U-Boot_overview#Generic_Distro_configuration

you should have:

STM32MP> mmc dev 0

switch to partitions #0, OK

mmc0 is current device

STM32MP> mmc dev 1

switch to partitions #0, OK

mmc1(part 0) is current device

[  3.467118] mmc0: new ultra high speed DDR50 SDHC card at address aaaa

[  3.473494] mmcblk0: mmc0:aaaa SC16G 14.8 GiB 

[  3.514541] mmcblk0: p1 p2 p3 p4 p5 p6 p7

[  3.541167] mmc1: new DDR MMC card at address 0001

[  3.545904] mmcblk1: mmc1:0001 004GA0 3.69 GiB 

[  3.549734] mmcblk1boot0: mmc1:0001 004GA0 partition 1 2.00 MiB

[  3.555800] mmcblk1boot1: mmc1:0001 004GA0 partition 2 2.00 MiB

[  3.561266] mmcblk1rpmb: mmc1:0001 004GA0 partition 3 512 KiB, chardev (243:0)

[  3.578150] mmcblk1: p1 p2 p3 p4 p5 p6

Rgds,

Olivier

[Pratik Manvar · Accepted solution]

Hi Olivier,

Sorry for the late response on this thread.

Yes, we were able solve this issue. Actually, one GPIO pin (eMMC clock pin) has been utilized by something else for custom things in bootloader. Once, we changed that pin as per new designed schematics, the eMMC get initialized without any issue in bootloader.

Thanks for your help.

Regards,

Pratik Manvar

[OlivierK]

Hi Pratik;

Thanks for your feedback. Glad that you're sorted out.

Regards,

Olivier