• Deepak Saxena's avatar
    [ARM] 3226/1: IXP4xx runtime expansion bus window size configuration · 54e269ea
    Deepak Saxena authored
    Patch from Deepak Saxena
    The expansion bus on the IXP46x NPU can be configured for either 32MiB or
    16MiB windows and changing the configuration causes the base address for
    each chip select for each region to change. Because of this, we cannot
    hardcode the physical base as we currently do. This patch checks the
    expansion bus configuration registers at runtime to determine the
    appropriate window size. Note that this requires that the bootloader
    already configured the device sizes appropriately, but I feel that is
    valid assumption to make as the bootloader must configure and access
    the flash window, the output display (LCD, LEDs, etc) window, and
    other expansion bus devices.
    Signed-off-by: default avatarDeepak Saxena <dsaxena@plexity.net>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
gtwx5715-setup.c 3.94 KB