linux-kernel - Re: 2.6.20-rc6 libata PATA ATAPI CDROM is not working

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Date:	Sat, 17 Feb 2007 10:58:16 +0000
From:	Joel Soete <soete.joel@...rlet.be>
To:	Tejun Heo <htejun@...il.com>
CC:	Luming Yu <luming.yu@...il.com>, Alan Cox <alan@...hat.com>,
	Ioan Ionita <opslynx@...il.com>,
	Alan <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	jgarzik@...ox.com
Subject: Re: 2.6.20-rc6 libata PATA ATAPI CDROM is not working

Hello Tejun,

Sorry for delay but I was a bit busy this week.

Tejun Heo wrote:
> Hello, Joel.
> 
> Joel Soete wrote:
>> A small update:
>> your patch also works against 2.6.20
> 
> Glad to hear that.
> 
>> but seems that open the door to numerous other pb:
>> 1/ pb to burn cd:
>> # md5sum cd060213.iso
>> 6a1248783a21722816b972aa9bae9d5e  cd060213.iso
>>
>> # ll cd060213.iso
>> -rwxr-xr-x 1 root root 3213312 Feb 13  2006 cd060213.iso
>>
>> # dd if=/dev/sr0 bs=1 count=3213312 | md5sum
>> dd: reading `/dev/sr0': Input/output error
>> 0337e9846d17779945c5c252d4f897f0  -
>> 3129344+0 records in
>> 3129344+0 records out
>> 3129344 bytes (3.1 MB) copied, 36.6963 seconds, 85.3 kB/s
>>
>> eventhought cdrecord seems to be successfull???
> 
> Hmm... 82K difference.  Can you burn an iso and md5sum the files 
> contained in the image and burned cd?
> 
Ok comparing the content of the original image:
# mount -t iso9660 -o ro -o loop /MultiCd/cd060213.iso /mnt/cd
# find /mnt/cd -type f -exec md5sum {} \;
37149d4961c0484f2cceb1a1614b253d  /mnt/cd/boot.cat
4ab996554b0e7ade115a3f284b876612  /mnt/cd/boot.msg
fbdc51c29d54dd227427b2ef90e1961e  /mnt/cd/initrd.cgz
92c9a50bed71257c29f069ec5dd819fc  /mnt/cd/isolinux.bin
927ce1096693b3a44af0e0d8a2ad720c  /mnt/cd/isolinux.cfg
4afcf65ff8259a3bccd0cf9f91675529  /mnt/cd/scsi.cgz
4714742585da795c3a69c262ce8c35ef  /mnt/cd/vmlinuz

and the content of the burned cd:
# mount /cdrom
# find /cdrom -type f -exec md5sum {} \;
37149d4961c0484f2cceb1a1614b253d  /cdrom/boot.cat
4ab996554b0e7ade115a3f284b876612  /cdrom/boot.msg
fbdc51c29d54dd227427b2ef90e1961e  /cdrom/initrd.cgz
92c9a50bed71257c29f069ec5dd819fc  /cdrom/isolinux.bin
927ce1096693b3a44af0e0d8a2ad720c  /cdrom/isolinux.cfg
4afcf65ff8259a3bccd0cf9f91675529  /cdrom/scsi.cgz
4714742585da795c3a69c262ce8c35ef  /cdrom/vmlinuz

it seems ok?

What is it lost???


>> 2/ (but that should be much more related to scsi api) sdcXX > sdc15 
>> doesn't works ;-(
>> # sfdisk -l /dev/sdc
>>
>> Disk /dev/sdc: 1826 cylinders, 255 heads, 63 sectors/track
>> Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
>>
>>    Device Boot Start     End   #cyls    #blocks   Id  System
>> /dev/sdc1   *      0+    195     196-   1574338+   b  W95 FAT32
>> /dev/sdc2        196    1825    1630   13092975    5  Extended
[snip]
>> /dev/sdc23       881+   1533     653-   5245191   83  Linux
>> /dev/sdc24      1795    1825      31     249007+  83  Linux
> 
> Whee, you have 24 partitions?
yes: it was dated from the early time I was testing various distro to choose one ;-)

>  Due to the way SCSI block device numbers 
> are laid out, SCSI supports only upto 15 partitions per device.
> 
Ah, I never had chance to use a disk array with fc connection on one of my linux boxe, so I don't know how can it works with 
up to 255 luns?

Thanks again,
	Joel
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