EMMC not being detected in DFU mode

[adnan_pasha]

Hi,

We have a custom carrier board based on STM32MP157DAC. We have built a custom yocto image.

• Yocto Version: Mickledore
• Machine: stm32mp15-disco
• SoM: STM32MP157DAC
• Distro: openstlinux-weston
• Linux Kernel: 6.1.82-stm32mp-r2-r0

I was able to get a EMMC binaries by adding below line in my local.conf
STM32MP_DT_FILES_EMMC += "stm32mp157f-dk2"

I have also attached the modified flashlayout for EMMC.

I came across a post here saying if default pins are changes we will have to do otp for emmc to be detected.

below are the pins we are using:-

PB14	SDMMC2_D0
PB15	SDMMC2_D1
PB3	SDMMC2_D2
PB4	SDMMC2_D3
PA8	SDMMC2_D4
PA15	SDMMC2_D5
PC6	SDMMC2_D6
PC7	SDMMC2_D7
PE3	SDMMC2_CLK
PG6	SDMMC2_CMD

Do we need to do otp for these pins or what can be done for EMMC to be detected during dfu(0,0,0) mode for flashing to emmc.

below is my flash layout file for emmc:-

#Opt	Id	Name	Type	IP	Offset	Binary
-	0x01	fsbl-boot	Binary	none	0x0	arm-trusted-firmware/tf-a-stm32mp157f-dk2-usb.stm32
-	0x03	fip-boot	FIP	none	0x0	fip/fip-stm32mp157f-dk2-optee-emmc.bin
P	0x04	fsbl1	Binary	mmc1	boot1	arm-trusted-firmware/tf-a-stm32mp157f-dk2-optee-emmc.stm32
P	0x05	fsbl2	Binary	mmc1	boot2	arm-trusted-firmware/tf-a-stm32mp157f-dk2-optee-emmc.stm32
P	0x06	metadata1	FWU_MDATA	mmc1	0x00084000	arm-trusted-firmware/metadata.bin
P	0x07	metadata2	FWU_MDATA	mmc1	0x00100000	arm-trusted-firmware/metadata.bin
P	0x08	fip-a	FIP	mmc1	0x00180000	fip/fip-stm32mp157f-dk2-optee-emmc.bin
PED	0x09	fip-b	FIP	mmc1	0x00580000	none
PED	0x0A	u-boot-env	ENV	mmc1	0x00980000	none
P	0x10	bootfs	System	mmc1	0x00A00000	st-image-bootfs-openstlinux-weston-stm32mp15-disco.ext4
P	0x11	vendorfs	FileSystem	mmc1	0x04A00000	st-image-vendorfs-openstlinux-weston-stm32mp15-disco.ext4
P	0x12	rootfs	FileSystem	mmc1	0x05A00000	st-image-qt-openstlinux-weston-stm32mp15-disco.ext4

Thanks.

 

[adnan_pasha]

Hi @PatrickF 

We are using EMMC04G-MT32-FBGA153 EMMC .

I had seen in few posts that certain EMMC's are not supported.
I wanted to know if our EMMC device is compatible with the STM32MP157DAC som.

Thanks

[adnan_pasha]

Hi,

I was able to resolve this issue and the device to boot using EMMC By changing the MMC_DEFAULT_MAX_RETRIES in TFA_source/driver/mmc/mmc.c file from 5 to 10.

Below is the link to my other post where I was able to resolve it.

https://community.st.com/t5/stm32-mpus-embedded-software-and/not-able-to-boot-from-emmc-on-stm32mp157dac-panic-at-pc/m-p/799044#M4744


Thanks.