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    SubjectRE: Loading and executing kernel from a non-standard address usin g SY SLINUX
    Date
    Yes the kernel is uncompressed to the right location (0x200000), in my case. When I try to uncompress it to a non standard address (other than 0x100000), the address mapping is affected. Thats why I tried to change the PAGE_OFFSET value to 0xc0100000, which should be the right value corresponding to (0x200000). 
    So the problem now is that, when a function is invoked it is unable to fetch the right physical address, since my address mapping (System.map) does not change when I change the value of PAGE_OFFSET and recompile the kernel.

    -Ravi


    -----Original Message-----
    From: Martin J. Bligh [mailto:mbligh@aracnet.com]
    Sent: Tuesday, March 04, 2003 11:35 AM
    To: Chakaravarthy, Ravikumar; linux-kernel@vger.kernel.org
    Subject: Re: Loading and executing kernel from a non-standard address using SY SLINUX

    > I am trying to load and boot the kernel from a non-standard address
    > (0x200000). I am using the SYSLINUX boot loader, which loads the
    > kernel at that address. I have also made changes to the kernel to
    > setup code and startup_32() function to effect the same. When I boot
    > the system It says
    >
    > Loading.......... Ready
    > Uncompressing Linux... OK Booting the kernel
    >
    > and then hangs.
    >
    > I guess the reason being the System.map entries are still using the
    > PAGE_OFFSET = 0xc0000000, as opposed to 0xc0100000.
    > I have the following questions??
    >
    > 1. How do i change the System.map to get the right PAGE_OFFSET.
    > 2. Will it work if I load and boot the kernel from a different address
    > like (0xdf000000)??
    >
    > 3. Am I in the right track or missing something.

    The kernel should decompress itself to the right space anyway ... check
    arch/i386/boot/compressed/head.S ... should be minimal changes needed,
    if any.

    M.

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