KernelCrashesWithRamdisk < DULG

%SECTION0{name=KernelCrashesWithRamdisk}% Linux Kernel crashes when using a ramdisk image


   Question:: I have a [[PowerPC][Power Architecture]]® board with 1 !GiB of RAM (or more).
     It works fine with root file system over NFS, but it will crash when I try to
     use a ramdisk.

   Answer:: Check where your ramdisk image gets loaded to.
     In the standard configuration, the Linux kernel can access only 768 !MiB of RAM,
     so your ramdisk image must be loaded *below* this limit. Check your boot messages.
     You are hit by this problem when U-Boot reports something like this:
     <verbatim>
Loading Ramdisk to 3fdab000, end 3ff2ff9d ... OK
     </verbatim>
     and then Linux shows a message like this:
     <verbatim>
mem_pieces_remove: [3fdab000,3ff2ff9d) not in any region
     </verbatim>
     To fix, just tell U-Boot to load the ramdisk image below the 768 MB limit:
     <verbatim>
=> setenv initrd_high 30000000
     </verbatim>

14.3.16. BogoMIPS Value too low		1. Abstract		14.3.18. Ramdisk Greater than 4 MB Causes Problems
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