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  • Mark A. Greer's avatar
    davinci: da8xx: Add base DA830/OMAP-L137 SoC support · 55c79a40
    Mark A. Greer authored
    
    
    The da830/omap l137 is a new SoC from TI that is similar
    to the davinci line.  Since its so similar to davinci,
    put the support for the da830 in the same directory as
    the davinci code.
    
    There are differences, however.  Some of those differences
    prevent support for davinci and da830 platforms to work
    in the same kernel binary.  Those differences are:
    
    1) Different physical address for RAM.  This is relevant
       to Makefile.boot addresses and PHYS_OFFSET.  The
       Makefile.boot issue isn't truly a kernel issue but
       it means u-boot won't work with a uImage including
       both architectures.  The PHYS_OFFSET issue is
       addressed by the "Allow for runtime-determined
       PHYS_OFFSET" patch by Lennert Buytenhek but it
       hasn't been accepted yet.
    
    2) Different uart addresses.  This is only an issue
       for the 'addruart' assembly macro when CONFIG_DEBUG_LL
       is enabled.  Since the code in that macro is called
       so early (e.g., by _error_p in kernel/head.S when
       the processor lookup fails), we can't determine what
       platform the kernel is running on at runtime to use
       the correct uart address.
    
    These areas have compile errors intentionally inserted
    to indicate to the builder they're doing something wrong.
    
    A new config variable, CONFIG_ARCH_DAVINCI_DMx, is added
    to distinguish between a true davinci architecture and
    the da830 architecture.
    
    Note that the da830 currently has an issue with writeback
    data cache so CONFIG_CPU_DCACHE_WRITETHROUGH should be
    enabled when building a da830 kernel.
    
    Additional generalizations for future SoCs in the da8xx family done by
    Sudhakar Rajashekhara and Sekhar Nori.
    
    Signed-off-by: default avatarSteve Chen <schen@mvista.com>
    Signed-off-by: default avatarMikhail Cherkashin <mcherkashin@ru.mvista.com>
    Signed-off-by: default avatarMark A. Greer <mgreer@mvista.com>
    Cc: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
    Cc: Sekhar Nori <nsekhar@ti.com>
    Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
    55c79a40