On Wed, Nov 26, 2008 at 08:46:43AM -0800, ron minnich wrote: > On Wed, Nov 26, 2008 at 8:39 AM, Kevin O'Connor <[EMAIL PROTECTED]> wrote: > > In order to minimize the number of address decoders needed, a device > > may share a decoder between the Expansion ROM Base Address register > > and other Base Address registers. When expansion ROM decode is > > enabled, the decoder is used for accesses to the expansion ROM and > > device independent software must not access the device through any > > other Base Address registers. > > Wow, I hope no hardware ever implemented that bad idea :-) > > Anybody know? how is an expansion rom supposed to actually get to the > hardware at that point, I wonder. ...
The steps are: enable option rom decode, copy option rom to memory, disable option rom decode, run option rom. So, the option rom runs when it can access the device. If you're curious - google for "PCI Firmware Specification v3.0 (2005-06-20).pdf" and read section 5.2. -Kevin -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
