Which preloader image to use?

Hello Frank-w,

Currently I can not boot u-boot from SD. it have the same problem. But I can boot u-boot completely from eMMC after following your instruction My preloader for SD: preloader_iotg7623Np1_sd_1333M.bin and my preloader for emmc is BPI-R2-EMMC-boot0-DDR1600-20190722-0k.img.gz U-boot version: https://github.com/frank-w/u-boot.git

Can you suggest to me some step to fix this issue ?

Thank so much

which issue do you have?? SD or eMMC? my repo contains multiple uboot-versions…whch one do you use?

Currently I can not boot u-boot from SD but can boot u-boot from eMMC my u-boot that i use: 2019-07-bpi-r2

then just use the 20190722 preloader for SD-Card instead of your old one

these both should be for SD:



for emmc you should use this one


because only this has extended memory-range for uboot and the emmc-flag

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OK I will try again thank you so much.

And I have also 1 question about use 4G module at link

Do you have file “ppp1.sh” ? Can you send to me ? Because I can not download “ppp1.sh” from Viet Nam


unrelated to this topic and no, i don’t have it…i also don’t have such module

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OK. Thank you so much I will flash preloader again

And do you have source code of preloader ? Can you share me ? Thanks

preloader is closed source, for the memory-expansion (to load bigger uboot) and the emmc-flag we needed vendor-support

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I got it. thank you so much

Hai frank… can you guide me how to write to sd card or emmc… I use armbian and stuck on <0x81e00004>=0xe59ff014

These preloaders are written like others…except armbian does anything different…

Just backup your sd (part you overwrite) and flash new one


sudo dd if=BPI-R2-preloader-DDR1600-20190722-2k.img of=${dev} bs=1k seek=2


sudo dd if=BPI-R2-EMMC-boot0-DDR1600-20190722-0k.img of=/dev/mmcblk1boot0

Afair emmc also needs sd-preloader on userpartition

sudo dd if=BPI-R2-preloader-DDR1600-20190722-2k.img of=/dev/mmcblk1 bs=1k seek=2
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