SATA (Serial ATA) support in 2.4.x?

SATA (Serial ATA) support in 2.4.x?

[Erik Steffl]

   what's the status of SATA support in 2.4.x kernels?

   it seems like the first kernel that supports SATA is 2.4.21-ac4. I 
found few messages on lkml but not much more info about status of 
development.

   I am specifically interested whether it should support disks above 
137GB (as I have problems accessing anything above 137GB on 250GB SATA 
drive)

   any info/answers/pointers to docs?

   (I already posted a message here about 137GB & SATA but got no 
answers so I am trying somewhat different question)

   TIA

	erik

Re: SATA (Serial ATA) support in 2.4.x?

[Jeff Garzik]

On Fri, Jul 25, 2003 at 11:50:16AM -0700, Erik Steffl wrote:
>   I am specifically interested whether it should support disks above 
> 137GB (as I have problems accessing anything above 137GB on 250GB SATA 
> drive)

It should.

I will be testing this when I return from OLS, next week.

	Jeff

Re: SATA (Serial ATA) support in 2.4.x?

[Erik Steffl]

Jeff Garzik wrote:
> On Fri, Jul 25, 2003 at 11:50:16AM -0700, Erik Steffl wrote:
> 
>>  I am specifically interested whether it should support disks above 
>>137GB (as I have problems accessing anything above 137GB on 250GB SATA 
>>drive)
> 
> 
> It should.
> 
> I will be testing this when I return from OLS, next week.

   any news?

   I have found that /var/log/kern.log has following messages (when 
trying to access blocks above 137GB, using e.g. badblocks):

Jul 29 00:41:02 jojda kernel: Attached scsi disk sda at scsi0, channel 
0, id 0, lun 0
Jul 29 00:41:02 jojda kernel: SCSI device sda: 490234752 512-byte hdwr 
sectors (251000 MB)
Jul 29 00:41:03 jojda kernel:  sda: sda1
Jul 29 00:47:41 jojda kernel:  I/O error: dev 08:00, sector 268435456
Jul 29 00:47:41 jojda kernel:  I/O error: dev 08:00, sector 268435456
Jul 29 00:47:41 jojda kernel:  I/O error: dev 08:00, sector 268435472
Jul 29 00:47:41 jojda kernel:  I/O error: dev 08:00, sector 268435456
Jul 29 00:47:41 jojda kernel:  I/O error: dev 08:00, sector 268435456
Jul 29 00:47:41 jojda kernel:  I/O error: dev 08:00, sector 268435464
Jul 29 00:47:41 jojda last message repeated 3 times

   I have found where these are coming from (drivers/scsi/scsi_lib.c) 
but  it's in fairly generic error routine that is called from number of 
places so it doesn't explain anything to me... (I'll take a look at it 
again but considering that I have almost zero experience with kernel 
programming it probably will not be very useful)

   this is using linux-2.4.21-ac4 kernel (scsi sata, as above messages show)

	erik

SOLVED: Re: SATA (Serial ATA) support in 2.4.x?

[Erik Steffl]

Erik Steffl wrote:
> Jeff Garzik wrote:
> 
>> On Fri, Jul 25, 2003 at 11:50:16AM -0700, Erik Steffl wrote:
>>
>>>  I am specifically interested whether it should support disks above 
>>> 137GB (as I have problems accessing anything above 137GB on 250GB 
>>> SATA drive)
>>
>>
>>
>> It should.
>>
>> I will be testing this when I return from OLS, next week.

   just in case anybody's searching the archives:

   I got the following advice from Jeff Garzik and it worked (didn't do 
much testing yet, but at least the whole disk is usable):

   2.4.21-ac4 (vanilla plus ac4 patches)

   create another vanilla tree with libata5 patches, then copy the 
following files to ac4 tree: drivers/scsi/{ata_piix,libata}.c and 
include/linux/ata.h

   build with scsi ata support (make sure you have bios set so that sata 
drives are seen as sata drives, not legacy ide drives, I only got 
machines lockups in legacy mode). The disks should be visible as scis 
disk (/dev/sd[a-z]).

   libata5 patch:

ftp://ftp.kernel.org/pub/linux/kernel/people/jgarzik/patchkits/2.4/2.4.21-libata5.patch.bz2

	erik