Use the sdcard while boot from emmc

[BigChris]

I use armbian installed on emmc of  Nanopi neo air. I want use the sdcard, buit i can't see the card. I insert the card after i boot from emmc. How can i mount the card?

[martinayotte]

You should see a /dev/mmcblk0 and /dev/mmcblk0p1.

Then, you can mount it using "mount /dev/mmcblk0p1 /mnt" and access file tree in /mnt.

 

[BigChris]

I think i see there only the emmc. 

If i start from sdcard, i see mmcblk0 and mmcblk1. If i start from emmc, there is only mmcblk0.

[wha]

See:  http://forum.armbian.com/index.php/topic/1702-orange-pi-plus-2e-where-is-16ghz-and-sd/#entry13163

 

about 1/2 way down the page.

 

It works for my orangepi+2e.  Just make sure that the sdhc card does NOT have a system image/u-boot on it.  I usually (on my desktop PC)  'dd' a couple megabytes of zeros (i.e. dd  if=/dev/zero  of=/dev/sdhc_device_name  bs=1M  count=20 ), then (re-)format the card.

 

[martinayotte]

Ah ! Ok ! I thought at first it was on Mainline. But yes, the above link should make it work.

 

[rlsten]

I have a couple of questions for what happens after you change sdc_detmode from 3 to 1 in the script.fex and convert it back to script.bin:

 

1.  Can you mount a microSD card at boot, or only manually mount it after boot? 

 

2.  If you later want to use an operating system on a microSD card, do you have to change sdc_detmode back to 3 before the Orange Pi will boot from the SD Card? Is there anything else you have to do to make it boot from an SD card if you have an OS on the emmc?

 

Thanks!

[thanh_tan]

Hello,

 

I use OPi Plus 2e., have installed RetroOrangepi on eMMC then the ROMs on sdcard.

 

Now i want the system while boot on eMMC to check the sdcard, if the sdcard is present then mount it on the directory /home/pi/RetroPie

 

I have used fstab but failed cause the Pi unable to boot

 

Now i want a safer method, can i use bash on boot?