On Sun, 2005-07-24 at 23:52 +0900, Jun OKAJIMA wrote: > >> > >> I think that one solution is hard coding the params of mem > >> in a BIOS image. But, how? > >> > > > >The documentation from VIA is simply crap. Nobody actually really > >know the correct value to program to the memory controller. > > > > > > Sorry, My explanation was wrong. I tested many combination > of M/B and DIMMs. And found most of then dont work at all, but > a little of them work rarelly. I mean, some combination work > but VERY unstable. For example, work once in 100 times reset. > > So, My idea is, for this kind of very unstable combination, do like this. > 1. add a func outputting params to console. > 2. try, try, try. push reset, push reset and hope to run. > 3. If it works as it happens, hard code this param to the src. > 4. hope runs stably. > > How about this way? >
You can try it but the current implementation in the SVN tree is probably the best thing we can get. The chipset is really a headache, even adding some console output in the DRAM init phase will crash the system. If you do have a lot of time and MB/DIMM, you can try to boot with factory BIOS and compare the northbridge register value to figure out any relation between these values and the DIMM configuration. > > >> --------------- > >> The third issue is, VGA. > >> I read the FreeVGA paper. Yes, it seems great. > >> But such complicated technology is really necessary? > > > >I am afraid we have to do it this way. It is probably the only way > >we can get VGA working without any vendor support. > > > >> For example, this guy succeeded to use normal VGA bios, although I failed. > >> http://www.carbotpc.com/linux/index.html > > > >I think this one uses the old "switch back to 16-bit mode and back" > >technology. It is actually much more complicated than an emulator. > > > >You can try to add VGA support by yourself. Please take a look at > >arima/hdama and tyan/*. There is one problem you have to solve, > >the VGA BIOS on EPIA makes some BIOS call back to the system BIOS, > >you have to emulate this in the emulator (see pcibios.c). > > > > Umm.. Then, how about porting LX1 VGA code to LX2? > In my EPIA M/B, LX1 VGA init seems to work. > I don't think we are going to do that. The reason we are using the emulator is to eliminate the mode switch inside LB. > --- Okajima, Jun. Tokyo, Japan. -- Li-Ta Lo <[EMAIL PROTECTED]> Los Alamos National Lab _______________________________________________ LinuxBIOS mailing list [email protected] http://www.openbios.org/mailman/listinfo/linuxbios
