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    Subject[PATCH 0/10] x86: EHCI and earlyprintk= improvements (Round 2)
    Date
    Greg KH requested a re-post of this patch series, so here is round 2.
    The only implementation change here was in patch 7 of 10 per comments
    from Alan Stern. The rest is just context changes from the typical
    kernel churn.

    --

    This patch series against the 2.6.31-rc3 covers improving the
    reliability of earlyprintk when using a usb debug device connected to
    an EHCI debug controller.

    The only patch that is not directly related to the USB earlyprintk is
    the 5th in the series which changes the console registration such that
    you can have more than one earlyprintk device. It is plausible to
    drop this patch if folks object to the idea or implementation.

    These patches were heavily test on 12 different systems with a total
    of 7 different EHCI controllers on both the x86_64 and i386
    architectures.

    The series starts by moving the EHCI debug code out of the
    arch/x86/kernel/early_printk.c and over to under the
    drivers/usb/early/ehci-dbgp.c. It is plausible to use this code on
    other architectures beyond x86. This also allows the earlyprintk.c to
    stay a bit cleaner, since it is primarily intended to handle the
    "earlyprintk=" setup.

    The other key changes are:
    * Update the documentation to reflect the usage constraints
    * The earlyprintk=keep,... works correctly with dbgp
    * Make the cr nl handling for dbgp the same as the uart drivers
    * Numerous errata and initialization fixes to make the usb
    debug device work with a wide range of EHCI controllers

    Thanks,
    Jason.

    The following changes since commit b592972493c38665efd7d429a01b23fcb21e331a:
    Linus Torvalds (1):
    Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/.../tip/l
    inux-2.6-tip

    are available in the git repository at:

    git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb.git for_gregkh_2

    Jason Wessel (10):
    ehci early_printk: split ehci debug driver from early_printk.c
    usb,early_printk: insert cr prior to nl as needed
    ehci-dbgp: Execute early BIOS hand off
    usb,early_printk: EHCI debug controller initialization delays
    printk,early_printk,console: Allow more than one early console
    ehci-dbgp: stability improvements and external re-init
    ehci-dbgp,ehci: Allow early or late use of the dbgp device
    ehci-dbgp: errata for EHCI debug controller initialization
    ehci-dbgp: errata for EHCI debug/host controller synchronization
    ehci-dbgp,documentation: Documentation updates for ehci-dbgp

    Documentation/kernel-parameters.txt | 2 +-
    Documentation/x86/earlyprintk.txt | 39 ++-
    arch/x86/kernel/early_printk.c | 780 ++--------------------------
    drivers/usb/Makefile | 1 +
    drivers/usb/early/Makefile | 5 +
    drivers/usb/early/ehci-dbgp.c | 996 +++++++++++++++++++++++++++++++++++
    drivers/usb/host/ehci-hcd.c | 8 +
    drivers/usb/host/ehci-hub.c | 10 +
    drivers/usb/host/ehci-pci.c | 39 +-
    include/linux/usb/ehci_def.h | 22 +
    kernel/printk.c | 41 +-
    11 files changed, 1158 insertions(+), 785 deletions(-)
    create mode 100644 drivers/usb/early/Makefile
    create mode 100644 drivers/usb/early/ehci-dbgp.c


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