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Is it possible to have Linux, upon reboot, pass execution to Grub without actually rebooting and invoking the BIOS? I have a GPT hard disk that I nee dplugged it at startup but the BIOS refuses to pass POST with it. I have looked at Coreboot but my MCP61 motherboard is onfortunately not supported.

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It is certainly possible, assuming you are capable of hacking the kernel. Nobody else wants this "feature". Most system software assumes that the HW has been quiesced by a reset signal, but you want to skip that reset. Hard to tell what may break if the SW is not capable of a boot w/o reset. – sawdust Jun 29 '12 at 21:42
@sawdust OK, case closed. – hexafraction Jun 30 '12 at 17:24

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