HP X2 210 tablet (UEFI) hang

[mcb30]

(2016-02-03 11:58)SebastianRoth Wrote:  I forgot to say that we can boot this exact same kernel (an even older ones) from USB stick using GRUB2 bootloader in UEFI mode. I guess there is quite a difference between loading the kernel via GRUB2/disk and iPXE/network. Do you think it would be worth trying to pxe boot on this device using pxelinux or GRUB (over PXE) just to see if this works?

GRUB has the ability (predating CONFIG_EFI_STUB) to treat the kernel as a bzImage rather than an EFI executable. This enters the kernel via a different path, which probably bypasses the code we're looking at in eboot.c.

To test the kernel's EFI stub path without using iPXE, you could try to start the kernel directly from the UEFI shell.

Michael