Messages in this thread | | | Subject | Re: [patch 2.5] VGA IO on systems with multiple PCI IO domains | From | Benjamin Herrenschmidt <> | Date | 28 Jan 2003 18:23:15 +0100 |
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On Tue, 2003-01-28 at 18:10, Ivan Kokshaysky wrote: > Here's the patch that converts vgacon.c to pci_request_legacy_resource(). > Tested on i386 and a single-bus alpha (alpha specific bits not included > here). > > Note that it breaks ppc, as VGA_MAP_MEM() is removed...
Ok, if I understand properly, all we have to do on PPC is to implement a pci_request_legacy_resource() that will do the right thing for legacy VGA memory as well ?
Then, please, check the return value of pci_request_legacy_resource() for getting to the VGA memory. Some machines (typically PowerMacs) simply don't give you a way to generate PCI cycles to those low memory addresses (you can't do VGA on those).
Disabling VGA dynamically depending on the machine have been a real pain until now. With that change, it will now just be a matter for our PPC implementation of pci_request_legacy_resource() to fail on machines where VGA memory can't be reached.
Ben.
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