memmap option causes inexplicable hang

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http://forums.fedoraforum.org – My system has 16GB RAM. With memtest86+, I determined that some RAM between 12621M and 12622M is bad, so I tried to block it out using the memmap option on the linux line in grub2. I did so by adding this option to the 'linux' line at bootup: memmap=4M$12620M The reason I blocked a larger chunk away than just 1k or 1M is just in case there is any kernel pickiness about what memory boundary granularity is acceptable, and 4M seems like an absolute largest reasonable value for such things. Anyway, when I tried to boot, the machine got stuck at 'Loading initial ramdisk ...". Any i (HowTos)