Saturday, February 18, 2017

system installation - Dual boot Windows 8.1 and Ubuntu on SD card EFI (Chuwi VI10)

I have bought a Chuwi VI10, very cheap chinese computer dual booting Windows 8.1 and Android. It runs InsydeH2O BIOS. I got rid of the Android stuff and decided I wanted to install Ubuntu on the SD-card and dual boot between Ubuntu and Windows 8.1. The main flash is too small to house both Windows and Ubuntu.



I manage to boot from a Ubuntu USB key without problem and I have verified that I have booted via EFI since /sys/firmware/efi exists.



Installation to the SD card (/dev/mmcblk1) works fine and EFI files are correctly added to /dev/mmcblk0p1/EFI.



I have also checked the EFI table using efibootmgr -v




...
Boot0007* Ubuntu HD(1,800,32000,89b680e5-c76a-48cf-b16f-eb7733137551)File(\EFI\ubuntu\shimx64.efi)
...


The item shows up in the EFI boot menu but if I select it it just boots Windows. Any way to debug why it is doing this?

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