Linux mounting hdd

AliasXZ · 02 February 2008, 12:34

Hey guys

I just want to ask if I have got this right:

I have FFS support and Amiga partition types in my kernel.
My Amiga boots fine with the cf card, im trying to plug into my pc using an IDE to USB, Linux finds the device, but says the RDB in block 0 has a bad checkcum, unknown partition table?

So I cant mount it, could it be that this ide to usb adapter is being weird? I had heard that some work and some don't?

cheers for help

poohbear · 02 February 2008, 21:30

I have not tried such a thing. However, you can probably find the location of the FFS filesystem manually and then setup the loopback driver at the right offset into the disk. Then you could mount the filesystem from the loopback driver, eliminating the use of the partition.

AliasXZ · 04 February 2008, 10:43

nah its no good

Hmmm.. I take it that noone else has really tried what im trying to do?

OddbOd · 04 February 2008, 20:17

This all sounds very strange.

Since you asked, yes I have mounted FFS partitions under Linux however not from an RDB disk (this failed when I tried it) and this is where I suspect the problem lies. Before going any further I need to know two important things, the kernel version you are using and the exact error message that the FS driver is producing (i.e. what does dmesg | grep AFFS produce).

AliasXZ · 04 February 2008, 21:05

ok:

The kernel im using is 2.6.22-r9, i cant begin to mount the device because it says:

"sdc: RDB in block 0 has bad checksum"
unknown partition table"

So it doesnt see the 2 partitions that the cf contains.

the output of dmesg | grep affs is nothing, which, i think is probably because it just doesn't recognise any partitions to begin with.

cheers for replies

OddbOd · 04 February 2008, 21:24

OK, when you configured the kernel did you also enable "Amiga partition table support" ?

AliasXZ · 04 February 2008, 22:13

yeah i did and not as a module

OddbOd · 05 February 2008, 18:07

Oops of course you did, it's the partition identifier that's generating the error message, I should have read the source more carefully before posting that last question, sorry about that.

I have a solution for you but unfortunately not an explanation as to why it works, my suspicion is that the prep tool you used to partition the card has written an RDB that the Amiga can understand but the Linux partition identifier code cannot.

To get it working correctly zero fill the entire card (I used WinHex but dd should work just as well) then use amiga-fdisk to partition the card. Note that amiga-fdisk is marked unstable by most distros probably because when you first run it the program checks the specified device for a valid RDB and if it doesn't find one it writes an RDSK block without prompting the user, so be certain to specify the right device node. Once the partitions are setup put the card back in your Amiga, format it and you should be good to go.

AliasXZ · 06 February 2008, 23:36

cheers for reply

ill have a play around and see what I can do

02 February 2008, 12:34	#1
AliasXZ Guru meditator Join Date: Jan 2008 Location: England, Huddersfield Age: 39 Posts: 166	Linux mounting hdd Hey guys I just want to ask if I have got this right: I have FFS support and Amiga partition types in my kernel. My Amiga boots fine with the cf card, im trying to plug into my pc using an IDE to USB, Linux finds the device, but says the RDB in block 0 has a bad checkcum, unknown partition table? So I cant mount it, could it be that this ide to usb adapter is being weird? I had heard that some work and some don't? cheers for help Last edited by AliasXZ; 02 February 2008 at 12:44.

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02 February 2008, 21:30	#2
poohbear Registered User Join Date: Jan 2004 Location: Toronto / Canada Posts: 65	I have not tried such a thing. However, you can probably find the location of the FFS filesystem manually and then setup the loopback driver at the right offset into the disk. Then you could mount the filesystem from the loopback driver, eliminating the use of the partition.

04 February 2008, 10:43	#3
AliasXZ Guru meditator Join Date: Jan 2008 Location: England, Huddersfield Age: 39 Posts: 166	nah its no good Hmmm.. I take it that noone else has really tried what im trying to do?

04 February 2008, 20:17	#4
OddbOd Registered User Join Date: Jul 2005 Location: Australia Age: 46 Posts: 666	This all sounds very strange. Since you asked, yes I have mounted FFS partitions under Linux however not from an RDB disk (this failed when I tried it) and this is where I suspect the problem lies. Before going any further I need to know two important things, the kernel version you are using and the exact error message that the FS driver is producing (i.e. what does dmesg \| grep AFFS produce).

04 February 2008, 21:05	#5
AliasXZ Guru meditator Join Date: Jan 2008 Location: England, Huddersfield Age: 39 Posts: 166	ok: The kernel im using is 2.6.22-r9, i cant begin to mount the device because it says: "sdc: RDB in block 0 has bad checksum" unknown partition table" So it doesnt see the 2 partitions that the cf contains. the output of dmesg \| grep affs is nothing, which, i think is probably because it just doesn't recognise any partitions to begin with. cheers for replies

04 February 2008, 21:24	#6
OddbOd Registered User Join Date: Jul 2005 Location: Australia Age: 46 Posts: 666	OK, when you configured the kernel did you also enable "Amiga partition table support" ?

04 February 2008, 22:13	#7
AliasXZ Guru meditator Join Date: Jan 2008 Location: England, Huddersfield Age: 39 Posts: 166	yeah i did and not as a module

05 February 2008, 18:07	#8
OddbOd Registered User Join Date: Jul 2005 Location: Australia Age: 46 Posts: 666	Oops of course you did, it's the partition identifier that's generating the error message, I should have read the source more carefully before posting that last question, sorry about that. I have a solution for you but unfortunately not an explanation as to why it works, my suspicion is that the prep tool you used to partition the card has written an RDB that the Amiga can understand but the Linux partition identifier code cannot. To get it working correctly zero fill the entire card (I used WinHex but dd should work just as well) then use amiga-fdisk to partition the card. Note that amiga-fdisk is marked unstable by most distros probably because when you first run it the program checks the specified device for a valid RDB and if it doesn't find one it writes an RDSK block without prompting the user, so be certain to specify the right device node. Once the partitions are setup put the card back in your Amiga, format it and you should be good to go.

06 February 2008, 23:36	#9
AliasXZ Guru meditator Join Date: Jan 2008 Location: England, Huddersfield Age: 39 Posts: 166	cheers for reply ill have a play around and see what I can do

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