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rbvim
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Joined: 27 Nov 2012
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PostPosted: Tue Nov 27, 2012 6:50 pm    Post subject: Installing X and using genkernel/recompiling linux Reply with quote

Hi, I want to install Gentoo with X support built in; and I'm considering using genkernel to do it. On a previous installation, I compiled my kernel manually, but then Gentoo complained about KMS or framebuffer support not being enabled when it was installing the X server (I can't remember the exact error, but when I tried startx it said "no screens found", I've read that the solution is to recompile my kernel).

I'm wondering if I can reinstall Gentoo using genkernel to compile my kernel and install X without any problems. I'm using Intel integrated graphics (4000 HD), so I don't think I need any fancy nVidia drivers.
I'm also wondering (slightly off topic) if I would be able to simply recompile my kernel, enabling the options from http://www.gentoo.org/doc/en/xorg-config.xml. I believe I need to access /boot, but I cannot mount it with "mount /boot" because I get "unknown filesystem ext2").

Thanks in advance.
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John R. Graham
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PostPosted: Tue Nov 27, 2012 7:13 pm    Post subject: Re: Installing X and using genkernel/recompiling linux Reply with quote

rbvim wrote:
I believe I need to access /boot, but I cannot mount it with "mount /boot" because I get "unknown filesystem ext2").
That means that you haven't included ext2 support in your kernel, which means you've created somewhat of a chicken & egg scenario. Yes, you can just modify your kernel .config and recompile the kernel but you're going to need to boot an install CD (minimal install CD, LiveCD, or SystemRescueCD are popular choices; whatever you used on the initial install is fine) to mount your boot partition and copy the newly compiled kernel (and, optionally, initramfs) in there. If you're using genkernel, then it's probably best to re-enter the chroot as described in the Handbook and just run genkernel from there.

- John
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Jaglover
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PostPosted: Tue Nov 27, 2012 7:22 pm    Post subject: Reply with quote

Actually, you can enable required filesystem support, run
Code:
make modules
followed by
Code:
make modules_install
and you will be able to mount.
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NeddySeagoon
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PostPosted: Tue Nov 27, 2012 7:25 pm    Post subject: Reply with quote

rbvim,

Welcome to Gentoo.

You can mount your boot but you need to make a kernel module first.
Get into make menuconf, for your currently running kernel. Check
Code:
 uname -r
if you are not sure which kernel that is.

Use the search (Press /) and enter ext2
The kernel will tell you where in the configuration menus that option is.
Go there and set it to <M>. <*> not work, as you still won't be able to mount boot.

Exit menuconfig and save your change. Run
Code:
make modules && make modules_install

You now have the ext2 driver as a loadable module for your kernel.

Code:
modprobe ext2
will load it, now mount /boot should work.

If you want to make ext2 a built it, you must mount /boot while you still have the module, so that you can copy the a new kernel with ext2 set to <*> over to /boot

You don't need your CD after all.
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