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    SubjectRe: [TESTING NEEDED] drivers/serial/sunzilog: Interrupt enable before ISR handler installed

    Gave this a spin on my SS20 today, have the console on the
    serial port. No problems seen. You will need to provide a
    signed-off-by line to get it accepted upstream, see

    ffd60050: ttyS0 at MMIO 0xf1100000 (irq = 44) is a zs (ESCC)
    Console: ttyS0 (SunZilog zs0)
    ffd60050: ttyS1 at MMIO 0xf1100004 (irq = 44) is a zs (ESCC)
    ffd60130: Keyboard at MMIO 0xf1000000 (irq = 44) is a zs
    ffd60130: Mouse at MMIO 0xf1000004 (irq = 44) is a zs

    Martin Habets

    Ack-by: Martin Habets <>

    On Sun, Apr 29, 2007 at 11:00:29PM +0100, Mark Fortescue wrote:
    > I have altered the patch as advised and I have attached it to prevent my
    > email client from making a mess of it.
    > The attached patch changes the interrupt enable sequence for the sunzilog
    > driver so that interrupts are not enabled untill after the interrupt
    > handler has been installed. If this is not done, some SS1 and SS2 sun4c
    > systems panic on un-handled interrupt before the handler gets installed
    > preventing boot.
    > It also adds in support for the ESCC version of the zilog chips. The ESCC
    > detection works but the FIFO enable may cause issues with modem and
    > receive character status. My interpretation of the SCC manual and the code
    > is that it sould be OK.
    > ---
    > Regards
    > Mark Fortescue.
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