• Paul Gortmaker's avatar
    sbc8548: Make enabling SPD RAM configuration work · 7e44f2b7
    Paul Gortmaker authored
    Previously, SPD configuration of RAM was non functional on
    this board.  Now that the root cause is known (an i2c address
    conflict), there is a simple end-user workaround - remove the
    old slower local bus 128MB module and then SPD detection on the
    main DDR2 memory module works fine.
    We make the enablement of the LBC SDRAM support conditional on
    being not SPD enabled.  We can revisit this dependency as the
    hardware workaround becomes available.
    Turning off LBC SDRAM support revealed a couple implict dependencies
    in the tlb/law code that always expected an LBC SDRAM address.
    This has been tested with the default 256MB module, a 512MB
    a 1GB and a 2GB, of varying speeds, and the SPD autoconfiguration
    worked fine in all cases.
    The default configuration remains to go with the hard coded
    DDR config, so the default build will continue to work on boards
    where people don't bother to read the docs.  But the advantage
    of going to the SPD config is that even the small default module
    gets configured for CL3 instead of CL4.
    Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
    Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
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