Hitachi Compute Blade 2500 series, Compute Blade 500 series Installation Manual page 46

Installing tboot package is not recommendable because TPM is not
available. If you install tboot package on your environment, set the
following in grub.conf.
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The following text contains settings above.
Note: Do not use "hashdist=1 mem=mem=1024G" command in the
Kernel parameter because using the option can cause the Red Hat
Enterprise Linux 6.2 boot fail.
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Hitachi Compute Blade Series OS Installation Guide for Red Hat Enterprise Linux
Comment out "kernel /tboot.gz logging=vga,serial,memory".
Change the first "module" to "kernel" in the line starting with
"module /vmlinuz".
Delete "intel_iommu=on amd_iommu=on".
Change the first "module" to "kernel" in the line starting with
"module /initramfs".
Red Hat Enterprise Linux 6