@spikerguy
I just tried “for_linux-vim-5101.tar u-boot.ext” use it on SD Card, with SD Card indeed it can boot up with another USB Flash drive or USB HDD attached to GT King Pro USB port.
Just to give a complete picture of the “for_linux-vim-5101.tar u-boot.ext” ability to boot up on Beelink GT King Pro.
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Boot image on SD Card, it can boot up successfully with USB Flash or USB HDD connected to other USB 3.0 port.
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Boot image on USB Flash drive, it can only boot up successfully if USB Flash Boot image inserted on USB OTG port but without any other USB drive connected to any of the USB 3.0 ports.
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Boot image on USB Flash inserted on a USB 3.0 Hub and the USB 3.0 Hub connected to any of the USB 3.0 ports but No other USB drive connected any of the other USB ports. With this method, the USB Flash image drive will heat up fast on the USB 3.0 Hub.
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Boot image on USB Flash drive, it will NOT boot up if it is inserted into any of the USB 3.0 directly.
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Boot image on USB Flash drive, it will not boot up even if inserted on USB 3.0 Hub and USB 3.0 Hub connected to USB OTG port. Infinite Boot Loop.