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This will write a copy of the u-boot from the OS image to the SPI flash chip in the laptop. Once this has been done it will always boot from the SPI u-boot instead of the u-boot on the eMMC or SD card. This u-boot has the option to select the boot medium you want and also supports booting from USB storage.
{{warning|If this messes up you need a soldering iron to fix booting}}
{{warning|Booting from this u-boot might be a problem for older kernels}}
{{warning|Another warning just in case}}
<source lang="shell-session">
$ apk add flashrom