Re: [gentoo-user] CPU you selected does not support x86-64 instruction set

[Peter Humphrey <peter@prh.myzen.co.uk>]

On Thursday 05 May 2016 08:58:06 Helmut Jarausch wrote:
> Hi,
> I had this just yesterday. The libraries of the SystemRescueCD are not
> 64 bits.
> 
> So, you have to proceed as follows.
> 
> Boot RescueCD with the alternative 64 bit kernel (and select the option
> to load all files into memory)
> 
> mkdir /oroot
> 
> ... mount the partition where you installed Gentoo on /oroot
> 
> mount --bind /proc /oroot/proc
> mount --rbind /dev /oroot/dev
> 
> chroot /oroot /bin/bash
> env-update
> source /etc/profile
> 
> ... and now you are in business
> 
> e.g.
> 
> cd /usr/src/linux-????
> 
> make menuconfig   or oldconfig
> make -j8
> make install
> make modules modules_install
> 
> Don't forget to install grub while you are in this chroot environment.
> 
> Then, exit from the chroot environment and reboot.

None of which will work unless the OP's booted his CD in UEFI mode to start 
with. That means, if his system is like mine, having the CD inserted before 
starting, prodding <DEL> or whatever until the BIOS screen comes up, then 
picking the optical drive in UEFI mode, then booting that.

Then the option to load all files into RAM is not available.

Also, grub is a total failure on this box: it just isn't detected. So I use 
gummiboot instead. It's also far, far easier to manage if you have more than 
one kernel to choose from, and it saves you having to learn all that 
baroquery. Frankly, I'm glad to see the back of grub-2.

-- 
Rgds
Peter