Messages in this thread | | | Subject | Re: AMD Geode GX/LX support V2 | From | "John Zulauf" <> | Date | Wed, 05 Oct 2005 17:01:13 -0600 |
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On Wed, 2005-10-05 at 15:15 -0400, lsorense@csclub.uwaterloo.ca wrote:
> So the SC1200 is a GX1 and CS5530 in one chip then (given the SC1200 > doesn't need a companion chip)?
*mostly* The SCxx00 series does integrate the GX1 and CS5530 technology but with some differences. The GX1 supports a few higher graphics resolutions, and the SCxx00 has some PCI bus speed options not supported in the GX1/CS5530 version. The timing values and modes are not the same for the two IDE controllers.
Mark Lord did the initial submissions for CS5530 and SCxx00 series IDE drivers and considered them different enough at the time to integrate them separately (to the extant I recall). (If you're still lurking Mark, please feel free to correct me on any of this info.)
>From the x86 core standpoint they can be considered the same core w.r.t. kernel configuration and capabilities -- same cacheline size, cache size, capabilities bits (MMX, et. al.), as well as optimal scheduling for the integer/FPU pipes. We've found the compiling 486 is the best of the gcc march's for the GX1/SCxx00 core. It's unlikely that an GX1 specific scheduling will find it's way into gcc at this point.
> Currently I use the SC1200 ide driver. > So far no DMA, but that could be because I use compact flash on the ide > connector. The card claims to support DMA though as far as I can tell. > or is the SCx200 using it's own ide system?
The SC1200 should support DMA, though there may be some restrictions if DMA and non-DMA devices are connected at the same time (i.e. it may revert to lowest-common-mode).
-- John Zulauf Senior MTS, Embedded Core Software Advanced Micro Devices, Inc. 1351 So Sunset St Longmont, CO 80501
303 774 5166 office 303 774 5801 fax
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