Trouble using some (fast) compact flash as ide device on an embedded system

[Marco Lazzarotto <m.lazzarotto@robox.it>]

As I reported in bug 8036 in bugzilla.kernel.org,

Hardware Environment:

 - Use a compact flash SanDisk SDCFB-128 Firmware revision HDX 2.15
   (we used other compact flashes with the same hw ad sw for years
    with  no trouble)

It happens on both etx boards:
 - VIA SOM-ETX (4475)
 - Gene-4312

Doing the command
sfdisk -R /dev/hdc

gives:

 * * *
ide1: start_request: current=0xc6ebe754 (rq->sect=0,block 0)
hdc: status error: status=0x58 { DriveReady SeekComplete DataRequest }
ide: failed opcode was: unknown
hdc: drive not ready for command
ide1: start_request: current=0xc6ebe754 (rq->sect=0,block 0)
hdc: do_special: 0x02
hdc: do_special: recalibrate
ide1: start_request: current=0xc6ebe754 (rq->sect=0,block 0)
hdc: reading: block=0 sectors=8, buffer = 0xc6cd40000
ide1: end_request: current=0xc6ebe754
 * * *

the 'bad bit' in status error is DataRequest



doing
sfdisk -l /dev/hdc

gives:

 * * *
ide1: start_request: current=0xc6ebecd4 (rq->sect=0,block 0)
hdc: reading: block=0, sectors=32, buffer=0xc6f37000
hdc: lost interrupt
hdc: lost interrupt [and so on several times]
 * * *

I have no knowledge of the internals of the linux kernel, but I'm a
programmer and have both hardware and time to spend on solving this issue.

Thanks for suggestions...

	Marco Lazzarotto
	Robox s.p.a.

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