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19853
September 12th, 2014 11:00
UEFI cd boot
I'm installing Gentoo and have been unable to get UEFI to boot a live cd or systemrescuecd. When I go into the BIOS and change mode from UEFI to BIOS, I am able to boot a minimal live cd. And from there I used gdisk to create two partitions, the first is GPT (FAT32), and the second is my LVM container.
But then when I go back into the BIOS and change mode to UEFI and try to boot systemrescuecd where I select bootx64.efi which then takes me to a GRUB screen, I then make a selection from there, and the screen just goes blank.
Anyone offer any suggestions to boot UEFI with unsupported Linux flavors on an r920.
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skylarking
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September 16th, 2014 01:00
Luckily i have been able to avoid the complexity of UEFI as good'ol BIOS still serves me rather well. Such 'old' mechanisms are simpler and IMHO provide better firmware security (especially when BIOS chip is socketted and a motherboard switch is needed to flash BIOS). No need for encrypted BIOS or complex keys/signed UEFI components/loaders, etc. Such UEFI mechanisms mainly serve to lock users away from their own hardware/property with the carrot being pusdo security... Well, enough of my anti UEFI rant...
Likely the issue you are having is that UEFI starts the boot process and somewhere during the authentication of all the components needed to boot but prior to handing over full controll to the OS, one component can not be authenticated correctly. And i suspect that UEFI doesn't report what the problem is so it's difficult to know what component has been authenticated and who's hardware/firmware can't be authenticated...
I suspect the likely culprit is that your graphics card VBIOS is not 'signed', and as such, UEFI stalls and you are left with a blank screen...
A possible solution is to update all the firmware within your computer... Start with system BIOS, then BMC, etc, etc , etc. Hopefully the firmware release note will indicate that the firmware itself is UEFI compatible and signed but don't hold your breath. Documentation is being dumbed down on a daily basis. Take particular note to update the graphics card firmware as this is likely the issue...
If this doesn't help, take note that IIRC Gentoo doesn't support UEFI out of the box. There are some actions you need to take to ensure a successful UEFI boot. Google 'gentoo uefi boot issues' should give you some reading material...
And on this last note, if systemrescue disk has not been updated to be UEFI bootable, then obviously you will not be able to use such a disk without modding it...
But as i said, i avoid UEFI...