EXT_DIRECT IDE Mode

EXT_DIRECT IDE Mode

[DavidHo]

Hi Steve,

My application needs a compactflash and a 1.8" disk drive connected to the
MPC852T.  Since the compact flash has already taken up the only PCMCIA
slot, the disk drive is directly attached to the PPC bus so I need to
enable EXT_DIRECT for the disk drive.

I haven't been able to make linux call the ide_init_hwif function.  I
looked at how ide.c works and it looks like it enables IDE interfaces on
the PCI first (ide_default_io_base returns non-zero).  I haven't yet been
able to find out where it call my function.

Would you be able to tell me how you got this mode working.

Regards,
David Ho




 >Subject: Re: MPC8xx IDE
 >From: Steven Scholz <steven.scholz@imc-berlin.de>
 >Date: Wed, 24 Oct 2001 14:02:33 +0200

 >> While trying to find an easy way to add non-volatile storage on a
 >> custion MPC860 board, I noticed that there was some support for IDE on
 >> the PCMCIA interface in the Linux kernel.

 >There are actually at least three ways for connecting an IDE HDD. See
 >ide-m8xx.c:

 >---
 >8xx_PCCARD uses the 8xx internal PCMCIA interface in combination
 >with a PC Card (e.g. ARGOSY portable Hard Disk Adapter),
 >ATA PC Card HDDs or ATA PC Flash Cards (example: TQM8xxL
 >systems)

 >8xx_DIRECT is used for directly connected IDE devices using the 8xx
 >internal PCMCIA interface (example: IVMS8 systems)

 >EXT_DIRECT is used for IDE devices directly connected to the 8xx
 >bus using some glue logic, but _not_ the 8xx internal
 >PCMCIA interface (example: IDIF860 systems)
 >---

 >I am probably the only one using EXT_DIRECT. ;-)

 >Drop me a line if you need schematics.


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Re: EXT_DIRECT IDE Mode

[Steven Scholz]

DavidHo@nanometrics.ca wrote:

> My application needs a compactflash and a 1.8" disk drive connected to the
> MPC852T.  Since the compact flash has already taken up the only PCMCIA
> slot, the disk drive is directly attached to the PPC bus so I need to
> enable EXT_DIRECT for the disk drive.
Ok.

> I haven't been able to make linux call the ide_init_hwif function.  I
> looked at how ide.c works and it looks like it enables IDE interfaces on
> the PCI first (ide_default_io_base returns non-zero).  I haven't yet been
> able to find out where it call my function.
>
> Would you be able to tell me how you got this mode working.

I do if you tell me which kernel version you tried.
I guess you have

CONFIG_BLK_DEV_MPC8xx_IDE=y
# CONFIG_IDE_8xx_PCCARD is not set
# CONFIG_IDE_8xx_DIRECT is not set
CONFIG_IDE_EXT_DIRECT=y

in your .config file?

Steven


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Re: EXT_DIRECT IDE Mode

[DavidHo]

Steve,

I'm using a variant of the 2.4.18 kernel from timesys.

The kernel is compiled with those settings.  (in your email)

I had to add a call to m8xx_ide_init in m8xx-setup.c at the end of
platform_init.

I can only find these defines in ide-m8xx.c.  I am thinking there must be
more to it than the one file.

Thanks for your help,
David




DavidHo@nanometrics.ca wrote:

> My application needs a compactflash and a 1.8" disk drive connected to
the
> MPC852T.  Since the compact flash has already taken up the only PCMCIA
> slot, the disk drive is directly attached to the PPC bus so I need to
> enable EXT_DIRECT for the disk drive.
Ok.

> I haven't been able to make linux call the ide_init_hwif function.  I
> looked at how ide.c works and it looks like it enables IDE interfaces on
> the PCI first (ide_default_io_base returns non-zero).  I haven't yet been
> able to find out where it call my function.
>
> Would you be able to tell me how you got this mode working.

I do if you tell me which kernel version you tried.
I guess you have

CONFIG_BLK_DEV_MPC8xx_IDE=y
# CONFIG_IDE_8xx_PCCARD is not set
# CONFIG_IDE_8xx_DIRECT is not set
CONFIG_IDE_EXT_DIRECT=y

in your .config file?

Steven


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Re: EXT_DIRECT IDE Mode

[Steven Scholz]

DavidHo,

> I'm using a variant of the 2.4.18 kernel from timesys.
>
> The kernel is compiled with those settings.  (in your email)
>
> I had to add a call to m8xx_ide_init in m8xx-setup.c at the end of
> platform_init.
>
> I can only find these defines in ide-m8xx.c.  I am thinking there must be
> more to it than the one file.

Hmm. 2.4.18 is pretty old. I don't know if there's support for MPC8xx IDE!

CONFIG_IDE_EXT_DIRECT was introduced long (!) after
CONFIG_IDE_8xx_PCCARD and CONFIG_IDE_8xx_DIRECT.

Did you add the code for IDE_EXT_DIRECT yourself?

Steven


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Re: EXT_DIRECT IDE Mode

[DavidHo]

The EXT_DIRECT item is already there in the configuration menu.  I thought
it has been fully implemented in that version, until I saw the functions
are not being called in platform_init.

Base on your knowledge, which kernel version has this mode (MPC8xx IDE)
fully working?

And do you know the work involved in porting the support to 2.4.18?  I am
gauging which is the easier route moving all the changes I have already
made to 2.4.2x or porting the changes to 2.4.18.

David




> I'm using a variant of the 2.4.18 kernel from timesys.
>
> The kernel is compiled with those settings.  (in your email)
>
> I had to add a call to m8xx_ide_init in m8xx-setup.c at the end of
> platform_init.
>
> I can only find these defines in ide-m8xx.c.  I am thinking there must be
> more to it than the one file.

Hmm. 2.4.18 is pretty old. I don't know if there's support for MPC8xx IDE!

CONFIG_IDE_EXT_DIRECT was introduced long (!) after
CONFIG_IDE_8xx_PCCARD and CONFIG_IDE_8xx_DIRECT.

Did you add the code for IDE_EXT_DIRECT yourself?

Steven


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Re: EXT_DIRECT IDE Mode

[DavidHo]

David,

> The EXT_DIRECT item is already there in the configuration menu.  I
thought
> it has been fully implemented in that version, until I saw the functions
> are not being called in platform_init.
>
> Base on your knowledge, which kernel version has this mode (MPC8xx IDE)
> fully working?
Hmm. I'd say it started somewhen at 2.4.20.

> And do you know the work involved in porting the support to 2.4.18?  I am
> gauging which is the easier route moving all the changes I have already
> made to 2.4.2x or porting the changes to 2.4.18.

I don't know how much changes you did. But I strongly recommend moving
to something newer! Otherwise you only get this advice later if you
run into some other problem and try to get help on the mailing list!

Steven


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Re: EXT_DIRECT IDE Mode

[Jaap-Jan Boor]

David,

Should there not be a call to the 8xx init function between
#ifdef CONFIG_IDE_EXT_DIRECT / #endif in
driver/ide/ide.c ?
There are a lot such init calls there

Jaap-Jan



On Thu, 2004-02-12 at 19:00, DavidHo@nanometrics.ca wrote:
> The EXT_DIRECT item is already there in the configuration menu.  I thought
> it has been fully implemented in that version, until I saw the functions
> are not being called in platform_init.
>
> Base on your knowledge, which kernel version has this mode (MPC8xx IDE)
> fully working?
>
> And do you know the work involved in porting the support to 2.4.18?  I am
> gauging which is the easier route moving all the changes I have already
> made to 2.4.2x or porting the changes to 2.4.18.
>
> David
>
>
>
>
> > I'm using a variant of the 2.4.18 kernel from timesys.
> >
> > The kernel is compiled with those settings.  (in your email)
> >
> > I had to add a call to m8xx_ide_init in m8xx-setup.c at the end of
> > platform_init.
> >
> > I can only find these defines in ide-m8xx.c.  I am thinking there must be
> > more to it than the one file.
>
> Hmm. 2.4.18 is pretty old. I don't know if there's support for MPC8xx IDE!
>
> CONFIG_IDE_EXT_DIRECT was introduced long (!) after
> CONFIG_IDE_8xx_PCCARD and CONFIG_IDE_8xx_DIRECT.
>
> Did you add the code for IDE_EXT_DIRECT yourself?
>
> Steven
>
>


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Re: EXT_DIRECT IDE Mode

[DavidHo]

Steve,

We have decided to move to a newer kernel (2.4.20 or greater).
As a simple check, would you please give me a list of files with the
CONFIG_IDE_EXT_DIRECT #ifdef so I can get a bit of assurance that I have
the support in the kernel before making the move.

Thanks,
David



David,

> The EXT_DIRECT item is already there in the configuration menu.  I
thought
> it has been fully implemented in that version, until I saw the functions
> are not being called in platform_init.
>
> Base on your knowledge, which kernel version has this mode (MPC8xx IDE)
> fully working?
Hmm. I'd say it started somewhen at 2.4.20.

> And do you know the work involved in porting the support to 2.4.18?  I am
> gauging which is the easier route moving all the changes I have already
> made to 2.4.2x or porting the changes to 2.4.18.

I don't know how much changes you did. But I strongly recommend moving
to something newer! Otherwise you only get this advice later if you
run into some other problem and try to get help on the mailing list!

Steven


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Re: EXT_DIRECT IDE Mode

[Steven Scholz]

> Steve,
>
> We have decided to move to a newer kernel (2.4.20 or greater).
> As a simple check, would you please give me a list of files with the
> CONFIG_IDE_EXT_DIRECT #ifdef so I can get a bit of assurance that I have
> the support in the kernel before making the move.

#~> grep -r -l CONFIG_IDE_EXT_DIRECT linux-2.4.21/*

linux-2.4.21/drivers/ide/ppc/mpc8xx.c
linux-2.4.21/drivers/ide/Config.in

Good luck,

Steven


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