2 messages, 2 authors, 2002-01-09 · open the first message on its own page
From: Michael Sokolov <hidden>
Date: 2002-01-09 20:18:37
Adrian Cox [off-list ref] wrote:
I have two CT69030 VGA chips on the same PCI bus, but I only enable their PCI memory mapped regions, and never use the legacy VGA addresses.
Ahh, I didn't know you could disable legacy VGA address decoding. MS ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
From: Adrian Cox <hidden>
Date: 2002-01-09 20:43:34
Michael Sokolov wrote:
Adrian Cox [off-list ref] wrote:quoted
I have two CT69030 VGA chips on the same PCI bus, but I only enable their PCI memory mapped regions, and never use the legacy VGA addresses.Ahh, I didn't know you could disable legacy VGA address decoding.
You don't need to. You just have to make sure that no legacy VGA address ever appears on the PCI bus for the device to respond to. This is quite easy - references by the PowerPC to addresses 0xa0000 to 0xfffff will go to RAM, not to PCI. If buffers for bus-mastering peripherals are never allocated in that range, then those addresses will never appear on the PCI bus. -- Adrian Cox http://www.humboldt.co.uk/ ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/