Won’t boot from eMMC

Tagged: boot eMMC

This topic has 3 replies, 2 voices, and was last updated 2 years, 9 months ago by Neeraj Dantu.

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- February 2, 2022 at 10:27 am #12036
  BillR
  Participant
  Our custom board is based off the Red board.
  eMMC works in general, but can’t boot off it, only SD card.
  Our TF-A device tree has the same definitions as Red Board’s device tree for sdmmc2.
  Using these trusted boot images which work fine when used for SD card boot:
  fsbl1 = tf-a.stm32
  fsbl2 = tf-a.stm32
  ssbl = u-boot.stm32
  I have followed the procedure from the relevant readme’s such as:
  https://github.com/ARM-software/u-boot/blob/master/board/st/stm32mp1/README,
  using Step 7 “Prepare SD card” but instead doing it to /dev/mmcblk2 for eMMC while running off SD card.
  Our chip is Rev Z, which I understand fixes a eMMC boot errata. Our eMMC is Micron 16GB.
- February 2, 2022 at 11:17 am #12037
  BillR
  Participant
  eMMC info from u-boot, in case its of use:
  OSD32MP> mmc dev 1
  switch to partitions #0, OK
  mmc1(part 0) is current device
  OSD32MP> mmc info
  Device: STM32 SD/MMC
  Manufacturer ID: 13
  OEM: 14e
  Name: S0J56
  Bus Speed: 52000000
  Mode: MMC High Speed (52MHz)
  Rd Block Len: 512
  MMC version 5.1
  High Capacity: Yes
  Capacity: 14.8 GiB
  Bus Width: 8-bit
  Erase Group Size: 512 KiB
  HC WP Group Size: 8 MiB
  User Capacity: 14.8 GiB WRREL
  Boot Capacity: 31.5 MiB ENH
  RPMB Capacity: 4 MiB ENH
- February 2, 2022 at 2:54 pm #12038
  BillR
  Participant
  I followed directions to instead do it from u-boot and it will boot now.
  I was unaware that eMMC has some dedicated boot partitions.
  a) prepare GPT on eMMC,
  example with 2 partitions, bootfs and rootfs:
  # setenv emmc_part “name=ssbl,size=2MiB;name=bootfs,type=linux,bootable,size=64MiB;name=rootfs,type=linux,size=512”
  # gpt write mmc 1 ${emmc_part}
  b) copy SPL on eMMC on first boot partition
  (SPL max size is 256kB, with LBA 512, 0x200)
  # ext4load mmc 0:4 0xC0000000 tf-a.stm32
  # mmc dev 1
  # mmc partconf 1 1 1 1
  # mmc write ${fileaddr} 0 200
  # mmc partconf 1 1 1 0
  b) copy U-Boot in first GPT partition of eMMC
  # ext4load mmc 0:4 0xC0000000 u-boot.stm32
  # mmc dev 1
  # part start mmc 1 1 partstart
  # part size mmc 1 1 partsize
  # mmc write ${fileaddr} ${partstart} ${partsize}
  To boot from eMMC, select BootPinMode = 0 1 0 and reset.
- February 3, 2022 at 12:59 pm #12043
  Neeraj Dantu
  Moderator
  BillR,
  Glad you are able to resolve your problem. As you indicated, eMMC and SD card have different partition layouts. Please see https://wiki.st.com/stm32mpu-ecosystem-v2/wiki/STM32CubeProgrammer_flashlayout for reference.
  Best,
  Neeraj
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