Temporarily boot firmware from SD card with plain files dtb.img, boot.img etc. on SD root possible?

[soldiaz]

I read bout libre- or corelec and the ability to boot temporarily from SD card if I understood right.Users advised to just put plain img files in root dir of SD card press reset while connecting power supply - that's it!

I ask, because this way I was able to test some firmware without taking risk of brick due to incompatibility...

(cant remove query on bottom......)

[mitchell4you]

hmm..
libreelec has a tool that makes a sdcard (see site or better the forum )
are you trying to boot android from sdcard?
if yes...
there are treads/posts about it here :

https://forum.libreelec.tv/board/38-amlogic/?pageNo=1

https://forum.armbian.com/forum/24-tv-boxes/

last time.. I checked, it required a lot of editing of the firmware

anyway.. goodluck

[soldiaz]

I've read somewhere to just put images on it...dtb.img, boot.img ...

Yes I'd like to boot android from sd

[soldiaz]

Alright, maybe someone can assist. I grabbed this firmware package: NEXBOX-A95X_S905X_7.1_8189_8g1g_171118

It came along with these files:

aml_sdc_burn.ini
aml_upgrade_package.img
u-boot.bin.sd.bin

I wondered about the u-boot.bin.sd.bin and was about to delete that, then I googled and found this VIM related: https://docs.khadas.com/vim1/CreateBootableSDCard.html

Getting Started

Download VIM1 U-Boot or build U-Boot to get the bootloader blob for your SD-Card.
No matter which method you choose, you need to keep in mind that there are different bootloader blobs for different boot disks/media:

• U-Boot blob u-boot.bin.sd.bin is built for SD-Cards
• U-Boot blob u-boot.bin is built for eMMC Storage

Insert the SD-Card into your PC, and make sure the disk is unmounted:

$ umount /dev/sdb1

Format the SD-Card as Fat32:

$ sudo mkfs.vfat /dev/sdb1

Run dd to write the U-Boot blob into the first sector of SD-Card:

$ sudo dd if=u-boot.bin.sd.bin of=/dev/sdb conv=fsync,notrunc bs=1 count=444 $ sudo dd if=u-boot.bin.sd.bin of=/dev/sdb conv=fsync,notrunc bs=512 skip=1 seek=1

Eject the SD-Card from your PC:

$ sudo eject /dev/sdb

Check Your Bootable SD-Card

Ensure that you have done the correct setup of your Serial to USB Module.

In order to check the Bootable SD-Card, you may also need to make sure that all data stored in the onboard eMMC has been completely erased.

I am in Windows....how can I write into first sector of SD?