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.miss...@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-Second-Edition/blob/master/format-sdcard.sh
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?
