Messages in this thread | | | Date | Wed, 24 Nov 1999 12:35:39 -0500 (EST) | From | Eric Lowe <> | Subject | Re: Hot PCI bus plugging |
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Hello,
> > Reading this thread with much interest I just have to think how much > > effort it is a least to get a minimal hot swapping support up and > > running. > > Looks like noone brought up the subject of resource allocation, so I will. > I don't know much about the bios and PCI as far as this goes, but doesn't > the bios assign io/mem/irq at boot up? How would this work on hot plug pci? > Who or what assigns the resources?
Yes you have a very good point there, that I mentioned in a private e-mail. The BIOS does that at bootup, so we would have to assume control of that ourselves. That wouldn't be too difficult, but would add some housekeeping to the PCI layers -- mainly allocating and keeping track of IRQs and base addresses/ranges. We also have to be careful to make sure we don't share IRQs with devices that don't want to share them -- introducing the possibility the user could insert a card that can't get an IRQ (ouch) because there are none available. (Dang those broken cards that don't share.. Why doesn't everybody just read the friggin' PCI spec??? :) )
-- Eric Lowe FibreChannel Software Engineer, Systran Corporation elowe@systran.com
"You can't spell failure without U-R-A." -Dispair.com
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