Fw: EXT_DIRECT IDE Mode

Steve,

Who calls ide_init_hwif_ports (function in asm-ppc/ide.h) if
CONFIG_BLK_DEV_IDEPCI is not configured and ide_default_io_base always
returns 0?

That's what's puzzling me.

David

----- Forwarded by David Ho/NMX/CA on 02/11/2004 04:42 PM -----

                      DavidHo@nanometrics.ca
                      Sent by:                                To:      Steven Scholz
                      owner-linuxppc-embedded@lists.l         [off-list ref]
                      inuxppc.org                             cc:      linuxppc-embedded@lists.linuxppc.org
                                                              Subject: Re: EXT_DIRECT IDE Mode

                      02/11/2004 01:54 PM





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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