Messages in this thread | | | Date | Wed, 20 Aug 2003 01:11:09 -0400 | From | Pete Zaitcev <> | Subject | Re: Console on USB |
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> Date: Tue, 19 Aug 2003 21:58:45 -0700 (PDT) > From: "Randy.Dunlap" <rddunlap@osdl.org>
> >> Is there any advice I might be able to use to get this going? > > > > You'd have to write it. Grep for register_console for starters. > > usb/serial/console.c:255: register_console(&usbcons);
Eeek, eating a crow now.
> >> I really want to be able to catch some oops output. > > > > If oops happens with interrupts closed, forget about it. > > USB needs interrupts to work. This is one of the reasons nobody > > bothered to implement console over USB serial. > > The call to register_console() also happens very late in the boot > sequence, so if your oops is early, USB console won't help.
It's true for many consoles, that's why sparc allows "-p" in SILO options, for instance. I think either wli or willy did "early VGA printk" patch.
Interrupts are a major problem. Also, the USB stack is pretty thick.
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