![]() Run any of the following commands to modify bootloader on device /dev/sdX: OS installation usually comes with their own bootloader, so if you want to modify the bootloader you have to do so after the installation. However, fastboot has less potential to make a mistake, so it is still recommended.įirst, make sure you have installed the OS of your choice to the storage media. Additionally you can also use this method to flash bootloader to eMMC's main partition. MicroSD and USB drive both show in Linux system as block devices, so you can modify their bootloader in the same way. Modify bootloader on microSD or USB drive Restart and you should be able to flash the bootloader according to the instructions listed in the eMMC erase guide. After the file is loaded keep hitting Ctrl+C in serial console until the bootloader stopped with a console waiting for command. Follow maskrom guide to setup and load u-boot.bin. Here is the instructions to do so as a last-ditch.įirst set up serial console since U-Boot console can only be accessed via serial. ![]() If your eMMC is so corrupt that above commands fails, you will need to erase those partitions from U-Boot console. Beware sudo fastboot flash bootloader could potentially damage your existing data. You do not need to erase before flashing, and you do not need to flash all 3 partitions. Sudo fastboot flash bootloader-boot1 bootloader.img Sudo fastboot flash bootloader-boot0 bootloader.img Sudo fastboot flash bootloader bootloader.img ![]() Sudo fastboot fetch bootloader-boot1 bootloader-boot1.bak Sudo fastboot fetch bootloader-boot0 bootloader-boot0.bak Sudo fastboot fetch bootloader bootloader.bak This is based on Amlogic's U-Boot source code, so it will behave differently from upstream U-Boot.įirst, follow maskrom guide to setup and load android-bootloader.img. In some cases, you will have to use Android's bootloader. ![]() Beware sudo fastboot flash mmc0 could potentially damage your existing data. Sudo fastboot flash mmc0boot1 bootloader.img Sudo fastboot flash mmc0boot0 bootloader.img Sudo fastboot flash mmc0 linux_distro.img Once a device with ID 18d1:0d02 is shown in lsusb and you can see a fastboot device is detected by sudo fastboot devices, you can run the following command to wipe/flash image to eMMC: Sudo dd if=.bin of=$DEVICE bs=512 skip=1 seek=1įirst, follow maskrom guide to setup and load rz-fastboot-loader.bin. Sudo dd if=.bin of=$DEVICE bs=1 count=444 Run the following command to update bootloader: Here we call it /dev/sdX but replace it with your real block device. Once rz-udisk-loader.bin is loaded you should have a USB storage device detected by your Linux system. Also download ( ) and put it in your current directory. This will preserve your data in eMMC.įirst, follow maskrom guide to setup and load rz-udisk-loader.bin. If your bootloader is broken you can usually try manual in-place update first. If you need to preserve the data, either make a disk image before wiping, or follow the manual guide below. We have updated our eMMC erase guide, which does the below operations automatically, and should fix most boot related issues.īeware this will result in data loss since the partition header will be wiped as well. You can read more about eMMC's hardware partitions from here. # boot from mmcblk0boot1 after mmcblk0 and mmcblk0boot0 are wiped # boot from mmcblk0boot0 after mmcblk0 is wiped Otherwise a different boot configuration will be used, instead of the one that came with your installation media. This means, to boot off any given storage media, you need to make sure bootloaders stored before this chain get wiped. If it fails to boot from eMMC it will search microSD card next, and finally the USB devices. It will search eMMC first with 3 read instructions, each for mmcblk0, mmcblk0boot0, and mmcblk0boot1. This is how the SoC finds the boot target. When you boot a bare board without any bootloader, you will see the following string printed on your serial console: 4 Modify bootloader on microSD or USB drive.1 A detailed guide for troubleshooting Radxa Zero's boot issue.
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