Messages in this thread | | | Date | Sat, 4 Jun 2005 11:35:59 -0400 (EDT) | From | Alan Stern <> | Subject | Re: [RFC/PATCH] Kdump: Disabling PCI interrupts in capture kernel |
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On Sat, 4 Jun 2005, Vivek Goyal wrote:
> Hi Alan, I know very little about consoles and their working. > I had a question. Even if console is being managed by platform firmware, in > initial states of booting, does it require interrupts to be enabled at > VGA contorller (at least for the simple text mode). I was quickly browsing > through drivers/video/console/vgacon.c and did not look like that this > console driver needed interrupts to be enabled at the controller.
This isn't an issue for VGA, as far as I know. It applies to architectures like PPC-64 and perhaps Alpha or PA-Risc. And I don't know the details; ask Grant Grundler.
> Anyway, looks like serial consoles will always work. So at least this can be > done for kdump case (CONFIG_CRASH_DUMP) and not generic kernel. Or, as I > mentioned in previous mail, while pre-loading capture kernel, pass a command > line parameter containing pci dev id of console and capture kernel does not > disable interrupts on this console.
I suspect you're right that implementing this only in kdump kernels will work okay.
For people interesting in reading some old threads on the subject, here are some pointers:
http://marc.theaimsgroup.com/?l=linux-usb-devel&m=111055702309788&w=2
http://marc.theaimsgroup.com/?l=linux-kernel&m=98383052711171&w=2
Alan Stern
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