• Lennert Buytenhek's avatar
    [ARM] 3809/3: get rid of 4 megabyte kernel image size limit · 2552fc27
    Lennert Buytenhek authored
    We currently have a hardcoded 4 megabyte uncompressed kernel image
    size limit, which is easily exceeded by, for example, enabling some of
    the various kernel debugging options.
    
    When setting up the initial page tables (which is where this 4M limit
    is hardcoded), it's actually relatively easy to find out the true size
    of the uncompressed kernel image and create enough page table entries
    for things to fit, so this patch makes it so.
    
    In the decompressor, we also need to know the size of the uncompressed
    kernel image, to figure out whether there is any chance that uncompressing
    the kernel might overwrite the compressed kernel image stored elsewhere
    in memory. We don't have that info at this boot stage, though, so we
    approximate the size of the uncompressed kernel by taking the compressed
    kernel image size and allowing for a maximum 4x expansion.
    Signed-off-by: default avatarLennert Buytenhek <buytenh@wantstofly.org>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    2552fc27
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