Beaglebone Black loads by default from SD card (without S2 pressed)

[Nuno Gonçalves]

I've tested in 2 recent production BBB and they are booting by default from the SD card, while the eMMC also have a valid bootable system.

U-Boot SPL 2015.04-00001-g96581e0 (Apr 13 2015 - 15:00:02)

U-Boot 2015.04-00001-g96581e0 (Apr 13 2015 - 15:00:02), Build: jenkins-github_Bootloader-Builder-144

       Watchdog enabled

I2C:   ready

DRAM:  512 MiB

MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1

Using default environment

Net:   <ethaddr> not set. Validating first E-fuse MAC

cpsw

Hit any key to stop autoboot:  0 

gpio: pin 53 (gpio 53) value is 1

switch to partitions #0, OK

mmc0 is current device

gpio: pin 54 (gpio 54) value is 1

Checking for: /uEnv.txt ...

933 bytes read in 10 ms (90.8 KiB/s)

gpio: pin 55 (gpio 55) value is 1

Loaded environment from uEnv.txt

Importing environment from mmc ...

Checking if uenvcmd is set ...

gpio: pin 56 (gpio 56) value is 1

Running uenvcmd ...

488 bytes read in 45 ms (9.8 KiB/s)

7062304 bytes read in 438 ms (15.4 MiB/s)

4003470 bytes read in 272 ms (14 MiB/s)

53571 bytes read in 63 ms (830.1 KiB/s)

Kernel image @ 0x82000000 [ 0x000000 - 0x6bc320 ]

## Flattened Device Tree blob at 88000000

   Booting using the fdt blob at 0x88000000

   Using Device Tree in place at 88000000, end 88010142

Starting kernel ...

[Robert Nelson]

It's a feature not a bug...

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[Nuno Gonçalves]

A little better explained:

S2 is never pressed.

Boot without SD card present:

U-Boot SPL 2015.04-00001-g96581e0 (Apr 13 2015 - 15:00:02)

U-Boot 2015.04-00001-g96581e0 (Apr 13 2015 - 15:00:02), Build: jenkins-github_Bootloader-Builder-144

       Watchdog enabled

I2C:   ready

DRAM:  512 MiB

MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1

Using default environment

Net:   <ethaddr> not set. Validating first E-fuse MAC

cpsw

Hit any key to stop autoboot:  0 

gpio: pin 53 (gpio 53) value is 1

Card did not respond to voltage select!

Card did not respond to voltage select!

gpio: pin 56 (gpio 56) value is 0

gpio: pin 55 (gpio 55) value is 0

gpio: pin 54 (gpio 54) value is 0

switch to partitions #0, OK

mmc1(part 0) is current device

gpio: pin 54 (gpio 54) value is 1

Checking for: /uEnv.txt ...

Checking for: /boot.scr ...

Checking for: /boot/boot.scr ...

Checking for: /boot/uEnv.txt ...

gpio: pin 55 (gpio 55) value is 1

472 bytes read in 14 ms (32.2 KiB/s)

Loaded environment from /boot/uEnv.txt

Checking if uname_r is set in /boot/uEnv.txt...

gpio: pin 56 (gpio 56) value is 1

Running uname_boot ...

loading /boot/vmlinuz-3.14.41-ti-r63 ...

7157368 bytes read in 411 ms (16.6 MiB/s)

loading /boot/dtbs/3.14.41-ti-r63/am335x-boneblack.dtb ...

87161 bytes read in 73 ms (1.1 MiB/s)

loading /boot/initrd.img-3.14.41-ti-r63 ...

3427224 bytes read in 206 ms (15.9 MiB/s)

debug: [console=ttyO0,115200n8 root=UUID=2f29119c-53ad-4e58-8773-cee555d855c4 ro rootfstype=ext4 rootwait fixrtc coherent_pool=1M quiet] ...

debug: [bootz 0x82000000 0x88080000:344b98 0x88000000] ...

Kernel image @ 0x82000000 [ 0x000000 - 0x6d3678 ]

## Flattened Device Tree blob at 88000000

   Booting using the fdt blob at 0x88000000

   Loading Ramdisk to 8fcbb000, end 8ffffb98 ... OK

   Loading Device Tree to 8fca2000, end 8fcba478 ... OK

Starting kernel ...

Boot with SD card present:

U-Boot SPL 2015.04-00001-g96581e0 (Apr 13 2015 - 15:00:02)

U-Boot 2015.04-00001-g96581e0 (Apr 13 2015 - 15:00:02), Build: jenkins-github_Bootloader-Builder-144

       Watchdog enabled

I2C:   ready

DRAM:  512 MiB

MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1

Using default environment

Net:   <ethaddr> not set. Validating first E-fuse MAC

cpsw

Hit any key to stop autoboot:  0 

gpio: pin 53 (gpio 53) value is 1

switch to partitions #0, OK

mmc0 is current device

gpio: pin 54 (gpio 54) value is 1

Checking for: /uEnv.txt ...

933 bytes read in 10 ms (90.8 KiB/s)

gpio: pin 55 (gpio 55) value is 1

Loaded environment from uEnv.txt

Importing environment from mmc ...

Checking if uenvcmd is set ...

gpio: pin 56 (gpio 56) value is 1

Running uenvcmd ...

488 bytes read in 46 ms (9.8 KiB/s)

7062304 bytes read in 438 ms (15.4 MiB/s)

4003470 bytes read in 272 ms (14 MiB/s)

53571 bytes read in 64 ms (817.4 KiB/s)