I have a machine here were SATA disks fail to attach on boot:
pciide0 at pci8 dev 12 function 0 "ServerWorks K2 SATA" rev 0x00: DMA
pciide0: using irq 0 for native-PCI interrupt
pciide0: port 0: unknown SStatus: 0x00000005
pciide0: port 0: PHY offline
pciide0: port 1: PHY offline
pciide0: port 2: PHY offline
pciide0: port 3: PHY offline
...and, of course, the machine fails to boot as it can't find its root
device (despite having been loading its kernel from it).
I have experimented with a diff which would loop until the phy's SStatus
register comes up with a reasonable value, and it has never needed more
than one loop. Therefore, I am suggesting the diff below, which simply
doubles the time between the phy reset and the status check.
With this diff, my disk is reliably found on every boot:
pciide0 at pci8 dev 12 function 0 "ServerWorks K2 SATA" rev 0x00: DMA
pciide0: using irq 0 for native-PCI interrupt
pciide0: port 0: 1.5Gb/s
wd0 at pciide0 channel 0 drive 0: <WDC WD2500JS-75NCB3>
wd0: 16-sector PIO, LBA48, 238418MB, 488281250 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 6
pciide0: port 1: PHY offline
pciide0: port 2: PHY offline
pciide0: port 3: PHY offline
Index: pciide.c
===================================================================
RCS file: /OpenBSD/src/sys/dev/pci/pciide.c,v
retrieving revision 1.355
diff -u -p -r1.355 pciide.c
--- pciide.c 18 Oct 2015 20:24:10 -0000 1.355
+++ pciide.c 14 Nov 2015 16:54:51 -0000
@@ -7928,7 +7928,7 @@ svwsata_drv_probe(struct channel_softc *
scontrol &= ~SControl_DET_INIT;
bus_space_write_4(ss->ba5_st, ss->ba5_sh,
(channel << 8) + SVWSATA_SCONTROL, scontrol);
- delay(50 * 1000);
+ delay(100 * 1000);
sstatus = bus_space_read_4(ss->ba5_st, ss->ba5_sh,
(channel << 8) + SVWSATA_SSTATUS);
