Booting Stretch (debian 9.3) from SD card redirects to emmc?

[aaron...@gmail.com]

When I boot Stretch with the /boot/uEnv.txt  containing this:

    dtb=am335x-boneblack-emmc-overlay.dtb

 

 

Then the SD card will start booting, all the LEDs pause, then restart and it boots from emmc instead!  Is this a bug?

My emmc is loaded with Jessie, so I can easily tell when this happens.

Also, this doesn't appear to happen on Jessie.

 

uEnv.txt:

#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0



 

uname_r=4.9.78-ti-r94

#uuid=

 

# this one boots to emmc even when starting from SD card
#dtb=am335x-boneblack-emmc-overlay.dtb

dtb=am335x-boneblack-uboot.dtb

 

###U-Boot Overlays###

###Documentation: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays

###Master Enable

enable_uboot_overlays=1

###

###Overide capes with eeprom

#uboot_overlay_addr0=/lib/firmware/<file0>.dtbo

#uboot_overlay_addr1=/lib/firmware/<file1>.dtbo

#uboot_overlay_addr2=/lib/firmware/<file2>.dtbo

#uboot_overlay_addr3=/lib/firmware/<file3>.dtbo

###

###Additional custom capes

#uboot_overlay_addr4=/lib/firmware/<file4>.dtbo

#uboot_overlay_addr5=/lib/firmware/<file5>.dtbo

#uboot_overlay_addr6=/lib/firmware/<file6>.dtbo

#uboot_overlay_addr7=/lib/firmware/<file7>.dtbo

###

###Custom Cape

#dtb_overlay=/lib/firmware/<file8>.dtbo

###

###Disable auto loading of virtual capes (emmc/video/wireless/adc)

#disable_uboot_overlay_emmc=1

#disable_uboot_overlay_video=1

#disable_uboot_overlay_audio=1

#disable_uboot_overlay_wireless=1

#disable_uboot_overlay_adc=1

###

###PRUSS OPTIONS

###pru_rproc (4.4.x-ti kernel)

#uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo

###pru_uio (4.4.x-ti & mainline/bone kernel)

#uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo

###

###Cape Universal Enable

enable_uboot_cape_universal=1

###

###Debug: disable uboot autoload of Cape

#disable_uboot_overlay_addr0=1

#disable_uboot_overlay_addr1=1

#disable_uboot_overlay_addr2=1

#disable_uboot_overlay_addr3=1

###

###U-Boot fdt tweaks... (60000 = 384KB)

#uboot_fdt_buffer=0x60000

###U-Boot Overlays###

 

cmdline=coherent_pool=1M net.ifnames=0 quiet

 

#In the event of edid real failures, uncomment this next line:

#cmdline=coherent_pool=1M net.ifnames=0 quiet video=HDMI-A-1:1024x768@60e

 

##Example v3.8.x

#cape_disable=capemgr.disable_partno=

#cape_enable=capemgr.enable_partno=

 

 

Any ideas? 

Thanks,

Aaron