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    SubjectRe: [08/36] AArch64: Kernel booting and initialisation
    On Mon, Jul 23, 2012 at 09:52:22PM +0100, Christopher Covington wrote:
    > Hi Catalin and Stephen,
    >
    > Catalin Marinas - July 8, 2012, 9:18 a.m.
    > > On Fri, Jul 06, 2012 at 10:32:54PM +0100, Stephen Warren wrote:
    > >
    > >> Also, on Tegra at least and perhaps OMAP too, there are a few parts
    > >> of earlyprintk serial port setup (i.e. port selection) which happen
    > >> as part of the decompressor rather than the main kernel image, so
    > >> we'd have to re-jig that too.
    > >
    > > Whatever we did on AArch32, if it was useful and we want to follow a
    > > similar model it needs porting given that the code cannot be shared. So
    > > there is nothing to re-jig but rather implement.
    > >
    > > As for earlyprintk, you can initialise it in the decompressed kernel
    > > anyway. But even though it's a useful debugging tool, it goes against
    > > the single Image aim (at least the current printascii/addruart
    > > implementation). I don't have a proper implementation yet.
    >
    > Would DCC [1] be a reasonably commonly available early printk mechanism
    > for the single image to provide?

    Yes, this can be implemented but I think it has its own restrictions,
    requiring a JTAG connection.

    --
    Catalin


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