libata pata_pdc2027x success on sparc64

From: Mikael Pettersson
Date: Mon Jul 17 2006 - 19:57:14 EST

Alan & Albert,

I just tried the patch-2.6.17-ide1.gz libata PATA patch
on a sparc64 box in which I had put an Ultra133TX2 PCI
card (pdc20269) and an old 80GB IBM Deskstar disk. The
results were excellent: did lots of I/O with no kernel
errors, and I got about 45MB/s read speed at udma5.

(A minor nit: the patch kit doesn't have a config option
for pata_pdc2027x, so I had to hack one in. See below.)

In contrast, the old IDE pdc202xx_new driver had lots
of problems with CRC errors causing it to disable DMA.
I wasn't able to manually tune it above udma3 without
getting more errors. This isn't sparc64-specific: I've
had similar negative experience with the old IDE Promise
drivers in a PowerMac.


--- linux-2.6.17/drivers/scsi/Kconfig.~1~ 2006-07-17 23:30:25.000000000 +0200
+++ linux-2.6.17/drivers/scsi/Kconfig 2006-07-17 23:39:25.000000000 +0200
@@ -843,6 +843,10 @@ config SCSI_PATA_PDC_OLD

If unsure, say N.

+ tristate "Newer Promise PATA controller support (Raving Lunatic)"
tristate "QDI VLB PATA support"
depends on SCSI_SATA
--- linux-2.6.17/drivers/scsi/Makefile.~1~ 2006-07-17 23:30:25.000000000 +0200
+++ linux-2.6.17/drivers/scsi/Makefile 2006-07-17 23:40:06.000000000 +0200
@@ -161,6 +161,7 @@ obj-$(CONFIG_SCSI_PATA_OPTI) += libata.o
obj-$(CONFIG_SCSI_PATA_OPTIDMA) += libata.o pata_optidma.o
obj-$(CONFIG_SCSI_PATA_PCMCIA) += libata.o pata_pcmcia.o
obj-$(CONFIG_SCSI_PATA_PDC_OLD) += libata.o pata_pdc202xx_old.o
+obj-$(CONFIG_SCSI_PATA_PDC_NEW) += libata.o pata_pdc2027x.o
obj-$(CONFIG_SCSI_PATA_QDI) += libata.o pata_qdi.o
obj-$(CONFIG_SCSI_PATA_RADISYS) += libata.o pata_radisys.o
obj-$(CONFIG_SCSI_PATA_RZ1000) += libata.o pata_rz1000.o
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