Genesio Lini

Hello everyone,
I am trying to achieve first boot with a Clearfog Base with eMMC.
 
It was not clear (at least to me) that the eMMC version does not allow booting from SD card *at all*
But hey, let's get this baby up&running, can anybody please help me?
 
I am trying to follow this procedure [https://www.armbian.com/clearfog-base/]:
1) Write the image to a USB flash drive
-> easy enough, I did it with Win32DiskImager and a well-tested 64GB USB stick
 
2) Load the modified u-boot (from the Armbian image) using the UART method
-> I have issues here. I suppose that UART method consists in plugging in the microUSB cable into my PC and open the COM3 port with Putty, than hitting some key to interrupt normal boot.
Unfortunately the terminal just spits out garbled text. The setup for the COM3 port in windows is 9600bps, 8data, no parity, 1 stop, no flow control and matches the config in Putty.
 
Where do I find the modified u-boot in armbian image?
 
I'm stuck here, and I don't know how to proceed.
 
Thank you
Genesio

I am now trying following steps from here: https://github.com/nightseas/arm_applications/blob/master/doc/getting_started_with_clearfog_base.md#boot-from-usb-disk----download-armbian-to-emmc
from inside armbian running from the USB stick:
 
dd'ing the img to the eMMC device was successful:
root@clearfogbase:~# dd if=/root/Armbian_5.35_Clearfogbase_Ubuntu_xenial_default_4.4.102.img of=/dev/mmcblk0 bs=4M 352+0 records in 352+0 records out 1476395008 bytes (1.5 GB, 1.4 GiB) copied, 79.9802 s, 18.5 MB/s root@clearfogbase:~# sudo mount /dev/mmcblk0p1 /mnt mount: special device /dev/mmcblk0p1 does not exist I was not able to mount the partition in order to modify the armbianEnv.txt.
But, as I have a uSD card into the slot, I am trying to boot from eMMC anyway.
 
So I just went on with dd'ing the bootloader to the eMMC:
root@clearfogbase:~# echo 0 > /sys/block/mmcblk0boot0/force_ro root@clearfogbase:~# echo 0 > /sys/block/mmcblk0boot1/force_ro root@clearfogbase:~# sudo dd if=u-boot.mmc of=/dev/mmcblk0boot0 1836+1 records in 1836+1 records out 940108 bytes (940 kB, 918 KiB) copied, 0.167683 s, 5.6 MB/s root@clearfogbase:~# sudo dd if=u-boot.mmc of=/dev/mmcblk0boot1 1836+1 records in 1836+1 records out 940108 bytes (940 kB, 918 KiB) copied, 0.17947 s, 5.2 MB/s root@clearfogbase:~# echo 1 > /sys/block/mmcblk0boot0/force_ro root@clearfogbase:~# echo 1 > /sys/block/mmcblk0boot1/force_ro root@clearfogbase:~# sync  
Now I think I could just set the dip switches into eMMC boot position and reboot.
Is that correct?

Ok, it works.
after setting the DIP switches to eMMC boot, I rebooted with the uSD card into the slot and armbian was running fine from eMMC.
 
Then I logged in and modified the armbianEnv.txt
 
The clearfog now boots from eMMC without uSD card into the slot.
 
Thank you for your help and patience