• Alexey Brodkin's avatar
    ARC: [plat-hsdk] initial port for HSDK board · a518d637
    Alexey Brodkin authored
    This initial port adds support of ARC HS Development Kit board with some
    basic features such serial port, USB, SD/MMC and Ethernet.
    Essentially we run Linux kernel on all 4 cores (i.e. utilize SMP) and
    heavily use IO Coherency for speeding-up DMA-aware peripherals.
    Note as opposed to other ARC boards we link Linux kernel to
    0x9000_0000 intentionally because cores 1 and 3 configured with DCCM
    situated at our more usual link base 0x8000_0000. We still can use
    memory region starting at 0x8000_0000 as we reallocate DCCM in our
    platform code.
    Note that PAE remapping for DMA clients does not work due to an RTL bug,
    so CREG_PAE register must be programmed to all zeroes, otherwise it will
    cause problems with DMA to/from peripherals even if PAE40 is not used.
    Acked-by: Rob Herring's avatarRob Herring <robh@kernel.org>
    Signed-off-by: Alexey Brodkin's avatarAlexey Brodkin <abrodkin@synopsys.com>
    Signed-off-by: default avatarEugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
    Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
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