Bug 194129

Summary:	sys-kernel/gentoo-sources-2.6.22-r8 SATA reported as IDE
Product:	Gentoo Linux	Reporter:	twey
Component:	[OLD] Core system	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED INVALID
Severity:	major	CC:	duaneg
Priority:	High
Version:	unspecified
Hardware:	x86
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	Kernel config dmesg output

Description twey 2007-09-28 19:21:50 UTC

Attempting to compile a 2.6.22-r8 kernel, my SATA hard drive (using an 82801GBM/GHM SATA controller) creates all my partitions as /dev/hda*, and although they do work, fsck complains about not being able to use DMA on them and read speed is very slow (~1.7MB/sec according to `hdparm -tT /dev/hda`).  Minimal install CD works fine.  I can disable ATA support in the kernel (someone recommended I do this in case it was conflicting), but then none of the hard drive partitions show up at all.

This very bug seems to be documented on the Gentoo forums (http://forums.gentoo.org/viewtopic-p-4299875.html), but for earlier kernel versions -- upgrading reportedly solved the problem.

Reproducible: Always

Steps to Reproduce:
1. Compile a kernel with SATA support (CONFIG_SATA_AHCI=y, CONFIG_ATA_PIIX=y, CONFIG_ATA_GENERIC=y [or n, makes no difference])
2. Boot it.

Actual Results:  
The bootloader fails to boot /dev/sdaX.  If everything is modified to boot from /dev/hdaX, fsck complains about lack of DMA on the drive, then `hdparm -tT /dev/hda` reveals very slow buffered-read speeds.

Expected Results:  
Created /dev/sdaX nodes and given faster read speeds from hdparm.

Comment 1 Duane Griffin 2007-09-28 21:00:59 UTC

Please post your .config and dmesg, thanks.

Comment 2 twey 2007-09-28 21:54:15 UTC

Created attachment 132131 [details]
Kernel config

Comment 3 twey 2007-09-28 21:55:10 UTC

Created attachment 132132 [details]
dmesg output

Comment 4 Duane Griffin 2007-09-28 22:15:44 UTC

Try disabling IDE, it is getting to the disks before libata. You probably also don't want ATA_PIIX, SATA_AHCI is better and will probably work for you (if not check the BIOS for AHCI mode).

Comment 5 twey 2007-09-28 22:48:04 UTC

Ah -- that's solved it.  Sorry for bothering you.

Comment 6 Duane Griffin 2007-09-28 22:50:26 UTC

No problem at all, that's why we're here.