How to boot from sd-card
STEP 1 : Get tools.
The tools must be run linux OS like Ubuntu.
STEP 2 : Get images.
Get the latest release images (from PM) .
STEP 3 :
Put images to tool's fold, like :
sdboot.sh
rockdev/image/parameter.txt
rockdev/image/boot.img
… …
STEP 4 : Get sd-card Node.
Before inserting sd-card to PC，Input the following command in terminal :
ls /dev/sd*
After inserting sd-card to PC，Input the following command in terminal :
ls /dev/sd*
The added node is for sd-card .
STEP 5 : Burn sd-card .
Insert sd-card, cd tools's path . Then input the following command :
./sdboot.sh sdX
[Note : sdX is the node getting from STEP 4 .]
NOTE：
1. It's beter if SD-card is more than 8GB and Class 10 high speed card .
2. The following case is OK for booting from SD-card .
(1) Without eMMC.
(2) EMMC is empty.
(3) EMMC is burned Debian OS.
3. If e-MMC is burned Android, the device CANNOT boot from sd-card .