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 at 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. ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/