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grub2 + 3.15.5 + 64 GB RAM, no boot
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sentania
n00b
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Joined: 01 Mar 2010
Posts: 4

PostPosted: Wed Jul 16, 2014 10:54 pm    Post subject: grub2 + 3.15.5 + 64 GB RAM, no boot Reply with quote

I have a box running grub2 + 3.15.5 gentoo-sources.

It's a pretty stripped down kernel, so it's likely I'm missing something, but I'm not sure what.

If I attempt to boot the system with my normal kernel options the system posts, loads grub, then it uncompresses the initramfs and hangs at "Loading the kernel."

If I add mem=32G to the kernel boot options the system will boot.

If I attempt to boot it with 32GB of physical ram installed and no options, it won't boot either.

Any advice on what I should look at?

Also the system will not boot the gentoo-minimal install CD or the adminCD (newest as of today).

Thanks.
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vaxbrat
l33t
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Joined: 05 Oct 2005
Posts: 731
Location: DC Burbs

PostPosted: Thu Jul 17, 2014 1:23 am    Post subject: Is it on an KVM? Reply with quote

I have a 32gb setup on a KVM switch which hangs at the "decompressing the kernel" line until I switch over to another server and then back. By then it has already jumped down to mucking with the TSC and will continue on normally.
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SDNick484
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Joined: 05 Dec 2005
Posts: 212

PostPosted: Thu Jul 17, 2014 8:21 pm    Post subject: Reply with quote

Sentania, where did you compile the kernel? Was it on the same system that's now not booting? If you can get a working live CD kernel, the mount your kernel source directory and try building with "make modconfig" to inherit all the loaded modules. Hopefully that will catch whatever you missed.

Personally I tend to go a little broad in my first kernel build for a new machine (unless I absolutely know I don't need a part because I have the same component from a different vendor, etc.) and then strip down from there.
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