On Easynote LM85 under both coreboot and vendor BIOS NPORTS is 3, yet port 4 is used for CD-ROM. NPORTS is RO on this chipset and has same value on vendor BIOS as well, so it's not a coreboot bug. Linux does essentially the same, by increasing nports variable if bits in PI are set above nports-1. GRUB ignores PI since this problem was detected.
diff --git a/src/hw/ahci.c b/src/hw/ahci.c
index ff5d5f9..3193d81 100644
--- a/src/hw/ahci.c
+++ b/src/hw/ahci.c
@@ -601,7 +601,7 @@ ahci_controller_setup(struct pci_device *pci)
dprintf(2, "AHCI: cap 0x%x, ports_impl 0x%x\n",
ctrl->caps, ctrl->ports);
- max = ctrl->caps & 0x1f;
+ max = 0x1f;
for (pnr = 0; pnr <= max; pnr++) {
if (!(ctrl->ports & (1 << pnr)))
continue;
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