beaglebone black dont boot from emmc

Alexander Zenkov

I have BBB board . I use this device with Buildroot. Some days ago i decide to switch on new release of Buildroot. Generated Image perfectly working from external SD card. But when i copy hhis Image to eMMC

boot is failed. Uboot tryed boot from another sysrems. But when, i type in uboot prompt "boot" system booted succesfully.

U-Boot 2020.04 (Nov 05 2020 - 22:34:11 +0700)

CPU : AM335X-GP rev 2.1
Model: TI AM335x BeagleBone Black
DRAM: 512 MiB
WDT:   Started with servicing (60s timeout)
NAND: nand_base: timeout while waiting for chip to become ready
nand_base: No NAND device found
0 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from FAT... MMC: no card present
mmc_init: -123, time 2
In:    serial@44e09000
Out:   serial@44e09000
Err:   serial@44e09000
<ethaddr> not set. Validating first E-fuse MAC
Net:   eth0: ethernet@4a100000
Warning: usb_ether MAC addresses don't match:
Address in ROM is          de:ad:be:ef:00:01
Address in environment is 7c:66:9d:0c:55:fb
, eth1: usb_ether
Hit any key to stop autoboot: 0
MMC: no card present
mmc_init: -123, time 1
MMC: no card present
mmc_init: -123, time 2
MMC: no card present
mmc_init: -123, time 2
MMC: no card present
mmc_init: -123, time 2
MMC: no card present
mmc_init: -123, time 2
switch to partitions #0, OK
mmc1(part 0) is current device
Scanning mmc 1:1...
40817 bytes read in 8 ms (4.9 MiB/s)
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
## Error: "bootcmd_nand0" not defined
starting USB...

When failed:

=> <INTERRUPT>
=> boot
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
340 bytes read in 2 ms (166 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc1 ...
Running uenvcmd ...
6090952 bytes read in 446 ms (13 MiB/s)
40817 bytes read in 8 ms (4.9 MiB/s)
bootargs=console=ttyS0,115200n8 root=/dev/mmcblk1p2 rw rootfstype=ext4 rootwait
## Flattened Device Tree blob at 88000000
   Booting using the fdt blob at 0x88000000
   Loading Device Tree to 8fff3000, end 8fffff70 ... OK

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0

uboot config : am335x_evm_defconfig

uEnv.txt from

vfat partition eMMC

# cat /mnt/uEnv.txt
bootpart=1:1
devtype=mmc
bootdir=
bootfile=zImage
bootpartition=mmcblk1p2
console=ttyS0,115200n8
loadaddr=0x82000000
fdtaddr=0x88000000
set_bootargs=setenv bootargs console=${console} root=/dev/${bootpartition} rw rootfstype=ext4 rootwait
uenvcmd= run set_bootargs;run loadimage;run loadfdt;printenv bootargs;bootz ${loadaddr} - ${fdtaddr}
#

over 5 years ago

0 Hong Guan64 over 5 years ago

TI__Guru* 76690 points

From your description, the issue seems related with u-boot environment.
You may want to take a closer look at "envboot" as listed below in "/include/environment/ti/mmc.h"
${mmcdev} may point to SD (=0) instead of eMMC (=1)

	"envboot=mmc dev ${mmcdev}; " \
		"if mmc rescan; then " \
			"echo SD/MMC found on device ${mmcdev};" \
			"if run loadbootscript; then " \
				"run bootscript;" \
			"else " \
				"if run loadbootenv; then " \
					"echo Loaded env from ${bootenvfile};" \
					"run importbootenv;" \
				"fi;" \
				"if test -n $uenvcmd; then " \
					"echo Running uenvcmd ...;" \
					"run uenvcmd;" \
				"fi;" \
			"fi;" \
		"fi;\0" \

0 Alexander Zenkov over 5 years ago in reply to Hong Guan64

Prodigy 20 points

Thanks for reply. But situation is more complicated as it seems to me

Hit any key to stop autoboot: 0
MMC: no card present
mmc_init: -123, time 1
MMC: no card present
mmc_init: -123, time 2
MMC: no card present
mmc_init: -123, time 2
MMC: no card present
mmc_init: -123, time 2
MMC: no card present
mmc_init: -123, time 2
switch to partitions #0, OK
mmc1(part 0) is current device
Scanning mmc 1:1...
40817 bytes read in 8 ms (4.9 MiB/s)
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
## Error: "bootcmd_nand0" not defined
starting USB...
As I can see MLO tried to boot u-Image from SD, then switched to eMMC, read it, at this moment mmcdev=1, but dont read uEnv.txt.

When I cancel booting process I print mmcdev at this noment mmcdev = 1.
This can be seen from the fact that the command "boot" successfully compleeted.

Problem in MLO algoritm switching from SD to eMMC as it seems to me

0 Hong Guan64 over 5 years ago in reply to Alexander Zenkov

TI__Guru* 76690 points

SPL/u-boot booting media depends on SYSBOOT[4:0] sampled at POR.
kernel/dtb loading media/order is configured in u-boot environment.
I'm using the SDK6.3 u-boot as an example, in "/include/configs/am335x_evm.h"

#define BOOT_TARGET_DEVICES(func) \
	func(MMC, mmc, 0) \
	func(LEGACY_MMC, legacy_mmc, 0) \
	func(MMC, mmc, 1) \
	func(LEGACY_MMC, legacy_mmc, 1) \
	func(NAND, nand, 0) \
	BOOT_TARGET_PXE(func) \
	BOOT_TARGET_DHCP(func)

It translates to portion of u-boot environment list from running "printenv" cmd @u-boot prompt:

bootcmd=if test ${boot_fit} -eq 1; then run update_to_fit; fi; run findfdt; run init_console; run envboot; run distro_bootcmd	
boot_targets=mmc0 legacy_mmc0 mmc1 legacy_mmc1 nand0 pxe dhcp
distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done

It indicates kernel/dtb loading order considering multiple AM335x boards(GP, BBB, SK, ICE...): mmc0(SD), mmc1(eMMC), nand, usb, ethernet...
For user's specific intended boot order, u-boot environment needs to be modified and optimized accordingly.
In your case, in addition to "setenv mmcdev 1", how about an additional one "setenv bootpart 1:2" .

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beaglebone black dont boot from emmc