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    SubjectRe: [PATCH]serial: make early_uart to use early_prarm instead of console_initcall
    On Sun, May 20, 2007 at 08:23:32PM -0700, Andrew Morton wrote:
    > On Fri, 18 May 2007 19:00:16 -0700 Yinghai Lu <Yinghai.Lu@Sun.COM> wrote:
    >
    > > [PATCH]serial: make early_uart to use early_prarm instead of console_initcall
    > >
    > > Make early_uart to use early_param, so uart console can be used earlier.
    > > Make it to be bootconsole with CON_BOOT flag, so can use console handover
    > > feature. and it will switch to corresponding normal serial console automatically.
    > > new command line will be
    > >
    > > earlycon=uart,io,0x3f8,9600n8
    > > earlycon=uart,io,0x3f8,9600n8 console=tty0
    > >
    > > it will print in very early stage
    > > Early serial console at I/O port 0x3f8 (options '9600n8')
    > > later for console it will print
    > > console handover: boot [uart0] -> real [ttyS0]
    >
    > I'll queue this up for some testing, but I'd be a bit reluctant to send it
    > into Linus due to my poor understanding of what it actually does. What
    > _is_ an early console, and how does it differ from a non-early one?

    It is someone's reimplemention of earlyprintk= for another architecture
    that happens to mostly work on x86 too because the code is not ifdeffed.
    I don't think it makes much sense on x86 though because earlyprintk exists.

    -Andi

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