[coreboot] Strange 440bx find; does it have a purpose? / Need SDRAM support guidance

[Keith Hui]

Hi all,

I'm going through coreboot sources _looking for a chipset with working SDRAM
support_ and came across this:

/usr/src/coreboot/src/northbridge/amd/gx1/northbridge.h:
#ifndef NORTHBRIDGE_INTEL_440BX_H
#define NORTHBRIDGE_INTEL_440BX_H

extern unsigned int i440bx_scan_root_bus(device_t root, unsigned int max);

#endif /* NORTHBRIDGE_INTEL_440BX_H */

I grepped for more references to this and got:

buurin@htcore:/usr/src/coreboot$ grep "i440bx_scan_root_bus" -R *
src/northbridge/amd/gx1/.svn/text-base/northbridge.h.svn-base:extern
unsigned int i440bx_scan_root_bus(device_t root, unsigned int max);
src/northbridge/amd/gx1/northbridge.h:extern unsigned int
i440bx_scan_root_bus(device_t root, unsigned int max);
src/northbridge/intel/i440bx/.svn/text-base/northbridge.h.svn-base:extern
unsigned int i440bx_scan_root_bus(device_t root, unsigned int max);
src/northbridge/intel/i440bx/northbridge.h:extern unsigned int
i440bx_scan_root_bus(device_t root, unsigned int max);
buurin@htcore:/usr/src/coreboot$

Does it serve a purpose at all in the AMD GX1 sub-tree?

Yes, I am working on 440BX SDRAM support and still looking for a board with
working SDRAM support in coreboot so I can borrow some ideas. The closest I
find is i810 in MS6178 and that's also a WIP. I'll look some more but for
now I know just programming the DRAM row boundary is not enough. Coreboot
fails at decompressing its payload. BTW I have a dead MS6178 that I salvaged
quite a few parts from. :-D

Thanks
Keith