Re: Kernel only sees 1 SATA channel out of 4 - nv520 chip

On an older Sun Ultra 40 (Not the M2 Variant) I have to apply the
following "patch" (or call it hack ;-) to get all SATA-drives working.
Maybe this could help on your machine, too?

Kurt

 cvs diff -u viaide.c
Index: viaide.c
===================================================================
RCS file: /cvsroot/src/sys/dev/pci/viaide.c,v
retrieving revision 1.50
diff -u -r1.50 viaide.c
--- viaide.c    20 Dec 2007 22:24:40 -0000      1.50
+++ viaide.c    12 Jan 2008 08:51:08 -0000
@@ -799,6 +799,21 @@
        pciide_mapreg_dma(sc, pa);
        aprint_verbose("\n");

+       /*
+        * enable memory-space access. sometimes memory space is
+        * _not_ enabled so "just do it" to get things going!
+        */
+       {
+       pcireg_t csr;
+       if (pa->pa_memt) {
+           pa->pa_flags |= PCI_FLAGS_MEM_ENABLED;
+           sc->sc_ba5_st = pa->pa_memt;
+       }
+       csr = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
+       pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
+           csr | PCI_COMMAND_MEM_ENABLE);
+       }
+
        if (sc->sc_dma_ok) {
                sc->sc_wdcdev.sc_atac.atac_cap |= ATAC_CAP_UDMA | ATAC_CAP_DMA;
                sc->sc_wdcdev.irqack = pciide_irqack;