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

[Pavel Machek <pavel@ucw.cz>]

Hi!

> 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.

Debug it, then :-). Try limiting its speed with hdparm to see if it
helps.