Re: doc2000 nftl[abcd] devices

[Brendan J Simon <brendan.simon@ctam.com.au>]

David Woodhouse wrote:

>brendan.simon@ctam.com.au said:
>
>> Now I try the same thing with nftlb and I get errors saying "Cannot
>>open  disk drive".  It should be the same process shouldn't it ?  Any
>>ideas of  where to look to fix or debug this ??  I've had a look at
>>nftldump and I  can see the 3 sets of media headers and they seem like
>>they are in the  right place.
>>
>
>It should be the same process, yes -- although perhaps you might want a 
>file system directly on each NFTL device, rather than partitioning them. 
>
>Stick some debugging printks into the nftl_open routine to see why it fails.
>(Or just enable debugging so the existing ones happen.)
>
<6>NFTL_open
<6>ENODEV: nftlnum = 1, thisNFTL = 0, minor = 16, ip = c3e56ba0, fp = 
c0192820
<6>NFTL_open
<6>ENODEV: nftlnum = 1, thisNFTL = 0, minor = 16, ip = c3e56ba0, fp = 
c0192820

I'm getting ENODEV.  It seems that the NFTLs[] array doesn't have the 
appropriate information.  How is this setup ?  I'm using modules so is 
it initialised so I assume it's initialised when I do an "insmod nftl". 
 Which routine scans the DOC2000 for NFTL devices and initialises the 
NFTLs[] array.  Interesting how nftl_open is called twice.  I'm not sure 
why ?

Here is a more detailed log:

# insmod nftl
Using /lib/modules/2.4.18-pre8/kernel/drivers/mtd/nftl.o
NFTL driver: nftlcore.c $Revision: 1.3 $, nftlmount.c $Revision: 1.6 $
NFTL_notify_add for DiskOnChip 2000
mtd->read = c500ac6c, size = 8388608, erasesize = 8192
NFTL_setup
Partition check:
 (== 0x%lx sects)
a:<6>NFTL_request
NFTL Read  request, from sector 0x0000 for 0x0002 sectors
Waiting for mutex
Got mutex
NFTL read request of 0x2 sectors @ 0 (req->nr_sectors == 8)
NFTL read request completed OK
end_request(1)
NFTL_request
NFTL Read  request, from sector 0x0002 for 0x0002 sectors
Waiting for mutex
Got mutex
NFTL read request of 0x2 sectors @ 2 (req->nr_sectors == 6)
NFTL read request completed OK
end_request(1)
NFTL_request
NFTL Read  request, from sector 0x0004 for 0x0002 sectors
Waiting for mutex
Got mutex
NFTL read request of 0x2 sectors @ 4 (req->nr_sectors == 4)
NFTL read request completed OK
end_request(1)
NFTL_request
NFTL Read  request, from sector 0x0006 for 0x0002 sectors
Waiting for mutex
Got mutex
NFTL read request of 0x2 sectors @ 6 (req->nr_sectors == 2)
NFTL read request completed OK
end_request(1)
 p1
devfs_register(disc): NULL ops, got c5017c8c from major table
devfs_register(part1): NULL ops, got c5017c8c from major table

#
#
# /util-linux/bin/fdisk /dev/nftlb
NFTL_open
ENODEV: nftlnum = 1, thisNFTL = 0, minor = 16, ip = c3e56ba0, fp = c0192820
NFTL_open
ENODEV: nftlnum = 1, thisNFTL = 0, minor = 16, ip = c3e56ba0, fp = c0192820

Unable to open /dev/nftlb
# grep -i nftl /proc/kmsg
<6>NFTL driver: nftlcore.c $Revision: 1.3 $, nftlmount.c $Revision: 1.6 $
<6>NFTL_notify_add for DiskOnChip 2000
<6>NFTL_setup
<4>a:<6>NFTL_request
<6>NFTL Read  request, from sector 0x0000 for 0x0002 sectors
<6>NFTL read request of 0x2 sectors @ 0 (req->nr_sectors == 8)
<6>NFTL read request completed OK
<6>NFTL_request
<6>NFTL Read  request, from sector 0x0002 for 0x0002 sectors
<6>NFTL read request of 0x2 sectors @ 2 (req->nr_sectors == 6)
<6>NFTL read request completed OK
<6>NFTL_request
<6>NFTL Read  request, from sector 0x0004 for 0x0002 sectors
<6>NFTL read request of 0x2 sectors @ 4 (req->nr_sectors == 4)
<6>NFTL read request completed OK
<6>NFTL_request
<6>NFTL Read  request, from sector 0x0006 for 0x0002 sectors
<6>NFTL read request of 0x2 sectors @ 6 (req->nr_sectors == 2)
<6>NFTL read request completed OK
<6>NFTL_open
<6>ENODEV: nftlnum = 1, thisNFTL = 0, minor = 16, ip = c3e56ba0, fp = 
c0192820
<6>NFTL_open
<6>ENODEV: nftlnum = 1, thisNFTL = 0, minor = 16, ip = c3e56ba0, fp = 
c0192820

Thanks,
Brendan Simon.