Pat Kane wrote:
> Alan Coopersmith wrote:
> > X.Org is already moving from the current pci scanning to libpciaccess,
> > for which Edward Shu in Sun's Beijing video driver team contributed the
> > Solaris port - I don't know if the interfaces it uses solves the SPARC
> > bus scanning problem or not though.
>
> In the file libpciaccess/solx_devfs.c from the current X.org git tree
> there is the following curious code:
>
>
> /*
> * Identify problematic southbridges. These have device id 0x5249 and
> * vendor id 0x10b9. Check for revision ID 0 and class code 060400 as well.
> * Values are little endian, so they are reversed for SPARC.
> *
> * Check for these southbridges on all architectures, as the issue is a
> * southbridge issue, independent of processor.
> *
> * If one of these is found during probing, skip probing other devs/funcs on
> * the rest of the bus, since the southbridge and all devs underneath will
> * otherwise disappear.
> */
> #if (NATIVE_ENDIAN == PCITOOL_ACC_ATTR_ENDN_BIG)
> #define U45_SB_DEVID_VID 0xb9104952
> #define U45_SB_CLASS_RID 0x00000406
> #else
> #define U45_SB_DEVID_VID 0x524910b9
> #define U45_SB_CLASS_RID 0x06040000
> #endif
>
> ... and in probe_dev()
>
> /*
> * Special case for the type of Southbridge found on
> * Ultra-45 and other sun4u fire workstations.
> */
> if ((config_hdr.dwords[0] == U45_SB_DEVID_VID) &&
> (config_hdr.dwords[2] == U45_SB_CLASS_RID)) {
> rval = ECANCELED;
> break;
> }
>
>
> What is special about the sun4u bridge?
>
> Pat
>
There is no "sun4u" bridge.
Only read the comments.
