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  • Vitaly Wool's avatar
    RISC-V: enable XIP · 44c92257
    Vitaly Wool authored
    
    
    Introduce XIP (eXecute In Place) support for RISC-V platforms.
    It allows code to be executed directly from non-volatile storage
    directly addressable by the CPU, such as QSPI NOR flash which can
    be found on many RISC-V platforms. This makes way for significant
    optimization of RAM footprint. The XIP kernel is not compressed
    since it has to run directly from flash, so it will occupy more
    space on the non-volatile storage. The physical flash address used
    to link the kernel object files and for storing it has to be known
    at compile time and is represented by a Kconfig option.
    
    XIP on RISC-V will for the time being only work on MMU-enabled
    kernels.
    
    Signed-off-by: default avatarVitaly Wool <vitaly.wool@konsulko.com>
    [Alex: Rebase on top of "Move kernel mapping outside the linear mapping" ]
    Signed-off-by: default avatarAlexandre Ghiti <alex@ghiti.fr>
    [Palmer: disable XIP for allyesconfig]
    Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
    44c92257