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Precised part number and iso update procedure

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As per @marmarek comments specify that EFI part is #2 and added procedure to edit iso using losetup
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Yassine Ilmi 2018-01-31 22:44:03 +00:00 committed by GitHub
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troubleshooting/uefi-troubleshooting.md
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@ -10,15 +10,19 @@ Troubleshooting UEFI related problems
Change installer kernel parameters in UEFI
---------------------
If you've installed successfully in legacy mode but had to change some kernel parameters for it to work, you should try installing in UEFI with the same kernel parameters.
If you've installed successfully in legacy mode but had to change some kernel parameters for it to work, you should try installing in UEFI mode with the same parameters.
Change the `xen.cfg` on a USB media
01. Attach the usb disk, find the EFI partition and mount it
02. Edit your xen.cfg changing the `kernel` key to add your kernel parameters on the boot entry of your choice
**Change the xen configuration on a USB media**
01. Attach the usb disk, mount the EFI partition (second partition available on the disk)
02. Edit your xen config (`xen.cfg/BOOTX64.cfg`) changing the `kernel` key to add your kernel parameters on the boot entry of your choice
03. Install using your modified boot entry
You can also update an iso image, use `losetup` to isolate the EFI partition and mount it.
**Change xen configuration directly in an iso image**
01. Get EFI partition boundaries `parted Qubes-R4.0-rc4-x86_64.iso unit B print`
02. Using the start address and the size of the EFI partition, setup a loop device for it `sudo losetup -o 524288 --sizelimit 30562304 /dev/loop0 Qubes-R4.0-rc4-x86_64.iso`
03. Mount the loop device `sudo mount /dev/loop0 /mnt`
04. Edit `EFI/BOOT/BOOTX64.cfg` to add your params to the `kernel` configuration key
05. Save your changes, unmount and dd to usb device
Cannot start installation, installation completes successfully but then BIOS loops at boot device selection, hangs at four penguins after choosing "Test media and install Qubes OS" in GRUB menu