• Arnd Bergmann's avatar
    ARM: orion/mvebu: unify debug-ll virtual addresses · 3584be9e
    Arnd Bergmann authored
    In a multiplatform configuration, enabling DEBUG_LL breaks booting
    on all platforms with incompatible settings. In case of the Marvell
    platforms of the Orion/MVEBU family, the physical addresses are
    all the same, we just map them at different virtual addresses,
    which makes it impossible to run a kernel with DEBUG_LL enabled on
    a combination of the merged mvebu and the legacy boardfile based
    platforms.
    
    This is easily solved by using the same virtual address everywhere.
    I picked the address that is already used by mach-mvebu for UART0:
    0xfec12000. All these platforms have a 1MB region with their internal
    registers, almost always at physical address 0xf1000000, so I'm
    updating the iotable for that entry.
    
    In case of mach-dove, this is slightly trickier, as the existing
    mapping is 8MB and a second 8MB mapping is already at the 0xfec00000
    address. I have verified from the datasheet that the last 7MB of the
    physical mapping are "reserved" and nothing in Linux tries to use
    it either. I'm putting this 1MB mapping at the same address as the
    others, and the second 8MB register area immediately before that.
    
    Link: https://lore.kernel.org/r/20190731195713.3150463-14-arnd@arndb.de
    Link: https://lore.kernel.org/linux-arm-kernel/87si3eb1z8.fsf@free-electrons.com/Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    3584be9e
dove.h 6.83 KB