RE: Mounting Compact Flash card under Linux on ppc823

In message [ref] you wrote:

quoted

I am using the Linux kernel from www.denx.de that has the version 2.4.4
(2002-08-09) with all the support for the 8xx pcmcia/direct etc... code.
When Linux boots (using NFS remote filesystem) it comes up and

prints the

quoted

following:

<misc deleted>
...
Kernel command line: root=/dev/nfs rw nfsroot=192.168.0.120:/ppcroot
nfsaddrs=19
2.168.0.20:192.168.0.120 init=/bin/bash idebus=25
ide_setup: idebus=25PCMCIA slot B: phys mem e0000000...ec000000 (size
0c000000)
Card ID: SST 48CF032 55LD017-A2 FW17-4C
 Fixed Disk Card
 IDE interface
 [silicon] [unique] [single] [sleep] [standby] [idle] [low power]
...
<more stuff deleted>
...

This "more stuff deleted" would have been the interesting  part;  the
kernel   will  tell  you  something  about  the  partition  table  it
recognizes, or at least the device. So if you are  sure  your  device
contains  a  valid partition table with at least one valid partition,
you should have seen something like:

	...
	hda: probing with STATUS(0x50) instead of ALTSTATUS(0x41)
	hda: CF 128MB, ATA DISK drive
	ide0 at 0xc7000320-0xc7000327,0xc3000106 on irq 13
	hda: 250368 sectors (128 MB) w/16KiB Cache, CHS=978/8/32
	Partition check:
	 hda: hda1

quoted

and finally gives me a shell prompt.  In the above, the Kernel seems to
recognize the card as being an SST-based flash card.  All seems

okay but the

quoted

IDE device does not appear in the /proc/devices listing.  Also, I can't
mount a filesystem (probably because the IDE doesn't seem to

have installed

quoted

completely).  The card I am using has a DOS filesystem on it with a few
files that I added.  My /etc/fstab has the following entry:

/dev/hda1       /mnt/flash      msdos   noauto,owner    0 0

Using make menuconfig, I set the following:
under IDE, ATA and ATAPI Block Devices:
   <*> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support
   [*]   MPC8xx IDE support
   (8xx_PCCARD) Type of MPC8xx IDE interface
under File systems:
   <*>  DOS FAT fs support
   <*>    MSDOS fs support
   <*>      UMSDOS: Unix-like file system on top of standard MSDOS fs
   <*>    VFAT (Windows-95) fs support

Questions:
- should the device really be hda1 ?

Yes, most probably.

quoted

- is there something more that I forgot in my board config

header file for

quoted

setting up pcmcia?

No, I don't think so.

My guess is that you forgot to enable any partition table support  in
your Linux kernel. Make sure your config file contains:


	CONFIG_IDE=y
	CONFIG_BLK_DEV_IDE=y
	CONFIG_BLK_DEV_IDEDISK=y
	CONFIG_IDEDISK_MULTI_MODE=y
	CONFIG_BLK_DEV_MPC8xx_IDE=y
	CONFIG_BLK_DEV_IDE_MODES=y
and
	CONFIG_PARTITION_ADVANCED=y
	CONFIG_MAC_PARTITION=y
	CONFIG_MSDOS_PARTITION=y
	CONFIG_NLS=y
	CONFIG_NLS_DEFAULT="y"
	CONFIG_NLS_ISO8859_1=y
	CONFIG_NLS_ISO8859_15=y

See  also  our   documentation   at   http://www.denx.de/re/DPLG.html
especially  section  "7.  Advanced Topics" (7.3.2. PC Card Support in
Linux).

Wolfgang Denk

I checked these and made a couple of changes but to no avail.  Then I added
the following lines to my board configuration file that I copied from the
tqm8xx.h file:

/*
 * Definitions for IDE0 Interface
 */
#define IDE0_BASE_OFFSET      0
#define IDE0_DATA_REG_OFFSET     (PCMCIA_MEM_SIZE + 0x320)
#define IDE0_ERROR_REG_OFFSET    (2 * PCMCIA_MEM_SIZE + 0x320 + 1)
#define IDE0_NSECTOR_REG_OFFSET     (2 * PCMCIA_MEM_SIZE + 0x320 + 2)
#define IDE0_SECTOR_REG_OFFSET      (2 * PCMCIA_MEM_SIZE + 0x320 + 3)
#define IDE0_LCYL_REG_OFFSET     (2 * PCMCIA_MEM_SIZE + 0x320 + 4)
#define IDE0_HCYL_REG_OFFSET     (2 * PCMCIA_MEM_SIZE + 0x320 + 5)
#define IDE0_SELECT_REG_OFFSET      (2 * PCMCIA_MEM_SIZE + 0x320 + 6)
#define IDE0_STATUS_REG_OFFSET      (2 * PCMCIA_MEM_SIZE + 0x320 + 7)
#define IDE0_CONTROL_REG_OFFSET     0x0106
#define IDE0_IRQ_REG_OFFSET      0x000A   /* not used       */

#define IDE0_INTERRUPT  13    /* = SIU_LEVEL6         */


This was the clincher, the defined values I had did not have the 0x320
offsets factored in.  I also had the IDE0_INTERRUPT set to the wrong value.
Now with these changes all is well. I was able to successfully mount the
partition and see my files.

Thanks for all the help,

Richard Jones


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