pata_pcmcia client driver

[kiran vedere]

Hi Peter:

Thank you for the information.
I am setting the CONFIG_BLK_DEV_SD=y in the kernel configuration file.
 Actually I am able to mount a USB Host as a SCSI device. So I do
think I have all necessary SCSI drivers to mount CF as SCSI device.
The CFHOST Controller part of SOC supports TrueIDE Mode of operation
in which the CF/CF+ Interface emulates the ATA Interface. As part of
this, the controller provides a set of registers to access the ATA
Task File Registers. I am IO mapping these registers to the ctrl_base
in the pata_pcmcia driver and setting the controller to True-IDE mode.
Is there anything additional I need to do? Can I use the pata_pcmcia
driver in True-IDE mode.

Regards,
Kiran

On Fri, Mar 27, 2009 at 2:55 AM, Peter Stuge <stuge-linux-pcmcia at cdy.org> wrote:
> kiran vedere wrote:
>> Interface to read/write CF Storage cards. I implemented the CF Host
>> Controller and I am using the existing pata_pcmcia client driver to
>> read/write to a Compact Flash Storage Card.
>
> Nice.
>
>
>> However when I insert the Card I cannot see any ata block device
>> which I can use to mount the card.
>
> Note that you will need SCSI disks enabled in your kernel to get a
> device, because all sata_ and pata_ drivers piggyback on the SCSI
> layer.
>
>
>> Below are the messages when I insert the card (I enabled debug
>> messages and also added my own).
> ..
>> ata1: PATA max PIO0 cmd 0xc8818030 ctl 0xc8818050 irq 24
>
> The "SCSI" controller is found. That's good.
>
>
>> probe begin
>> port EH scheduled
>> ata_scsi_error:ENTER
>> ata_port_flush_task:ENTER
>> ata_port_flush_task:EXIT
>> ata_bmdma_error_handler:ENTER
>> ata_bmdma_drive_eh:ENTER
>> ata_bmdma_drive_eh:qc=0x0
>> ata_eh_link_autopsy:ENTER
>> ata_eh_recover:ENTER
>> ata1 port frozen
>> ENTER
>> ata_std_softreset:ENTER
>> about to softreset, devmask=0
>> ata1: bus reset via SRST
>
> Maybe not so good? The port appears to have frozen and is then reset.
>
>
>> found ATA device by sig
>> found ATA device by sig
>> EXIT, classes[0]=9 [1]=9
>> ata_std_postreset:ENTER
>> EXIT, no device
>> ata1 port thawed
>
> Two ATA devices seem to be found, but I don't know what "by sig"
> means. I also don't know what classes[] means. In the end, whatever
> was found does not qualify as a device anyway.
>
>
>> I was able to use /sys/bus/pcmcia/devices/ to read some CF card
>> details such as Manf_ID/Prod ID, etc however there was no
>> /sys/bus/scsi entry available.
>>
>> Do I need anything more to access the CF Storage card or I am
>> missing any of the steps in the process? Please clarify.
>
> Again, you need CONFIG_BLK_DEV_SD. Perhaps it will be more fruitful
> to contact linux-scsi or wherever you can find libata experts.
>
>
> //Peter
>
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