grub2 + 3.15.5 + 64 GB RAM, no boot

sentania · n00b Joined: 01 Mar 2010 Posts: 4

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.

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

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.

SDNick484 · Apprentice Joined: 05 Dec 2005 Posts: 231

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.