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    Subject[PATCH] CON_BOOT

    New console flag: CON_BOOT

    CON_BOOT is like early printk in that it allows for output really
    early on. It's better than early printk because it unregisters
    automatically when a real console is initialised. So if you don't get
    consoles registering in console_init, there isn't a huge delay between
    the boot console unregistering and the real console starting. This is
    the case on PA-RISC where we have serial ports that aren't discovered
    until the PCI bus has been walked.

    I think all the current early printk users could be converted to this
    scheme with a minimal amount of effort.

    diff -urpNX dontdiff linus-2.6/include/linux/console.h parisc-2.6/include/linux/console.h
    --- linus-2.6/include/linux/console.h 2005-03-02 04:35:07.000000000 -0700
    +++ parisc-2.6/include/linux/console.h 2005-03-02 04:25:54.000000000 -0700
    @@ -84,6 +84,7 @@ void give_up_console(const struct consw
    #define CON_PRINTBUFFER (1)
    #define CON_CONSDEV (2) /* Last on the command line */
    #define CON_ENABLED (4)
    +#define CON_BOOT (8)

    struct console
    diff -urpNX dontdiff linus-2.6/kernel/printk.c parisc-2.6/kernel/printk.c
    --- linus-2.6/kernel/printk.c 2005-03-02 04:35:10.000000000 -0700
    +++ parisc-2.6/kernel/printk.c 2005-03-15 09:20:32.339891098 -0700
    @@ -804,6 +804,11 @@ void register_console(struct console * c
    if (!(console->flags & CON_ENABLED))

    + if (console_drivers && (console_drivers->flags & CON_BOOT)) {
    + unregister_console(console_drivers);
    + console->flags &= ~CON_PRINTBUFFER;
    + }
    * Put this console in the list - keep the
    * preferred driver at the head of the list.
    "Next the statesmen will invent cheap lies, putting the blame upon
    the nation that is attacked, and every man will be glad of those
    conscience-soothing falsities, and will diligently study them, and refuse
    to examine any refutations of them; and thus he will by and by convince
    himself that the war is just, and will thank God for the better sleep
    he enjoys after this process of grotesque self-deception." -- Mark Twain
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