Stefan Reinauer <[EMAIL PROTECTED]> writes: > * Eric W. Biederman <[EMAIL PROTECTED]> [030903 17:47]: > > First the most basic result I have is that I need to know what all of the > > logical devices that come out of a chip are. > > > So off of each logical device I have one or more channels. The only > > way I could think of to describe multiple channels is to repeat > > the logical device in the configuration file. > > > > All of the logical device paths are relative to the device they are hanging > > off of (it just looks like the bus number). So to say the amd/amd8131 was > > hanging off of the second hypertransport link I would change it's logical > > devices to: > > > > southbridge amd/amd8131 "amd8131" > > pci 1:0.0 > > pci 1:0.1 > > pci 1:1.0 > > pci 1:1.1 > > end > > > > I am not saying that is the best way to go, but it currently works. > > Ah. this is fine and allows porting linuxbios easily to new opteron > mainboards. > I see some drawbacks: > > * the logical devices of the amd8131 pci-x bridge has to be described in > the mainboard configuration file. This means a lot of duplicate config > "code" spread over the mainboard directory. Can this somehow go to the > Config.lb file in southbridge/amd/amd8131/ ?
Yes. But at the same time everything there is explicit and up front. Which is not necessarily a bad thing. It is very hard to see what is going on if you introduce a level of indirection here to be more sparse. I have tried for the most part to ensure that if you don't mention a logical device it still turns up. It is just that you can not feed it any static configuration if it is not mentioned. > * The device description itself and the link (channel?) information is > intermixed (preventing above config change from happening) I introduced channel because that is a concept that is purely in the configuration. How that maps to hardware capabilities can vary. Think a pci bridge chip with 8 pci busses hanging off of it, for the kinds of problem I was trying to solve. > * link information is duplicate. This might be a feature though when > devices happen that connect to more than one link. (Is this > theoretically possible, i.e. to raise bandwidth?) A little. > > The register "up" is something that has not been used at all yet. Personally > > I am not comfortable with the fact that we have both cpu and northbridge > > instances for the cpus.. > > This looks weird for the opteron case, true. But most architectures > still don't come with an on-cpu northbridge, so keeping that seperated > might be a good idea (in case a certain northbridge can cope with > several cpu types) Right. Which is why I have not messed with it yet. I have just stared with a rough draft that works. I don't have problems with changing it, so long as all of the requirements are met. > > > Does it look like this? : > > > > > > 8111 > > > | > > > 8131 > > > | > > > CPU0 -- CPU1 > > > > Yes. The order of the device structures is significant. > > should this: > > southbridge amd/amd8131 "amd8131" > pci 0:0.0 > pci 0:0.1 > pci 0:1.0 > pci 0:1.1 > end > southbridge amd/amd8111 "amd8111" > pci 0:0.0 > pci 0:1.0 > [..] > end > > not rather look like this then: ? > > southbridge amd/amd8131 "amd8131" > pci 0:0.0 > pci 0:0.1 > pci 0:1.0 > pci 0:1.1 > southbridge amd/amd8111 "amd8111" > pci 1:0.0 > pci 1:1.0 > [..] > end > end Quite possibly. A hypertransport chain is a weird case. For the moment I am treating it like a weird pci bus, and that seems to work... But further nesting might not be bad with the right set of changes. > > Yes. Except I don't yet have a way to automatically down clock it from 800Mhz > > which it claims it can do but cannot. > > this seems only like a matter of the information not being parsed from > an appropriate place in the config file yet. Yep, pretty much. Although for bug fixes I would like it if the configuration file didn't have to be involved. Just the driver for the 8131 saying that it can't do 800Mhz which is a slightly different thing. Eric _______________________________________________ Linuxbios mailing list [EMAIL PROTECTED] http://www.clustermatic.org/mailman/listinfo/linuxbios
