Hello,
I've tried two different default configurations while building u-boot:
* am335x_boneblack_vboot_defconfig * am335x_evm_defconfig
I formatted sd-card with this script: https://github.com/PacktPublishing/Mastering-Embedded-Linux-Programming-Seco... Then I copied *MLO* and *u-boot.img* into the boot partition. Here is boot log for am335x_boneblack_vboot_defconfig case (for am335x_evm_defconfig it's similar):
|U-Boot SPL 2020.10-rc3 (Aug 28 2020 - 10:16:38 +0200)| |WDT: Not found! Trying to boot from MMC1 Loading Environment from FAT... *** Warning - bad CRC, using default environment Loading Environment from MMC... *** Warning - bad CRC, using default environment U-Boot 2020.10-rc3 (Aug 28 2020 - 10:16:38 +0200) CPU : AM335X-GP rev 2.1 Model: TI AM335x BeagleBone Black DRAM: 512 MiB MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1 Loading Environment from FAT... *** Warning - bad CRC, using default environment Loading Environment from MMC... *** Warning - bad CRC, using default environment <ethaddr> not set. Validating first E-fuse MAC Net: eth2: ethernet@4a100000, eth3: usb_ether Press SPACE to abort autoboot in 2 seconds switch to partitions #0, OK mmc0 is current device SD/MMC found on device 0 Failed to load 'boot.scr' Failed to load 'uEnv.txt' switch to partitions #0, OK mmc0 is current device Scanning mmc 0:1... switch to partitions #0, OK mmc0 is current device SD/MMC found on device 0 Failed to load '/boot/zImage' switch to partitions #0, OK mmc1(part 0) is current device Scanning mmc 1:1... Found /boot/extlinux/extlinux.conf|
As you see, it tries to boot from MMC1 (I suppose that it's sd-card), it fails to boot from MMC1, then it switches to eMMC (where is full Linux, i.e. boot + kernel) and boots successfully from eMMC.
There are warnings: "bad CRC". Probably this is the cause of boot failure ? Could it be problem of copying of u-boot files ... or erroneous formatting of sd-card. Have someone an idea how to check these issues. Thanks. Sincerely, Pavel.