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    SubjectRe: [PATCH] kernel/printk.c: Concerns about the console handover
    On Fri, Sep 21, 2007 at 02:36:50PM +0100, Maciej W. Rozycki wrote:
    > On Fri, 21 Sep 2007, Andrew Morton wrote:
    > > It would be useful to have some basic information like: Which kernel
    > > version was this found in? Which kernel version last worked?
    > The kernel used was a 2.6.23-rc5 snapshot from Sep 4th, 2007 taken from
    > the tree (as stated by the revision of the patch provided).
    > There is no version that can be considered working as the change to add
    > the printk() to register_console() went in before drivers/serial/zs.c was
    > added and the old drivers/tc/zs.c driver might have been to sloppy to
    > handle such bits as the transmitter enable properly. I may investigate.
    > Chances are nobody tried any version of the kernel from the period
    > between the printk() was added and drivers/tc/zs.c removed with the
    > DECstation; I have not.
    > Anyway, I did confirm keeping the transmitter enabled all the time makes
    > the problem go away.

    I suspect the correct fix for this is to take the fix in the ARM tree
    for serial_core's console initialisation, and ensure that zs.c handles
    the power management of the port (enabling/disabling transmitter)
    in the power management callback.

    You can find the fix in the mbox archive:

    Russell King
    Linux kernel 2.6 ARM Linux -
    maintainer of:
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