Here is boot log when using u-boot files, originated from u-boot build where *am335x_evm_defconfig* file was used as default configuration :
U-Boot SPL 2020.10-rc3-00012-g9f04a634ef (Aug 29 2020 - 11:40:17 +0200) Trying to boot from MMC1 U-Boot 2020.10-rc3-00012-g9f04a634ef (Aug 29 2020 - 11:40:17 +0200) CPU : AM335X-GP rev 2.1 Model: TI AM335x BeagleBone Black DRAM: 512 MiB WDT: Started with servicing (60s timeout) NAND: 0 MiB MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1 Loading Environment from FAT... *** Warning - bad CRC, using default environment <ethaddr> not set. Validating first E-fuse MAC Net: eth2: ethernet@4a100000, eth3: usb_ether Hit any key to stop autoboot: 0 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
The last line "Found /boot/extlinux/extlinux.conf" signifies, that boot process from sd-card failed and BBB switched to eMMC (where *extlinux.conf* indeed does exist) and then successfully boots from eMMC.
What's wrong with SD card ?
Thanks.
On 30/08/2020 19:47, Peter Robinson wrote:
On Sun, Aug 30, 2020 at 6:41 PM Pavel Yermolenko py.missuri@sunrise.ch wrote:
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 ?
No, that's just because it can't find a saved environment variables to load.
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.
It looks off a mSD card OK for me, have you tried holding down the button (the one near the mSD card) when powering on to tell it to force the mSD card?