Is my flash being detected?

Is my flash being detected?

[ashwinp]

Hi freinds,
	I am trying to use mtd on L7205sdb.The flash chip used is AM29LV160DB.
The flash size is 16 MB in byte mode and processor data bus being 32 bits wide.
The .config for MTD is as below
CONFIG_MTD=y
CONFIG_MTD_DEBUG=y
CONFIG_MTD_DEBUG_VERBOSE=3
CONFIG_MTD_CFI=y
CONFIG_MTD_CFI_AMDEXT=y
CONFIG_MTD_ROM=y
CONFIG_MTD_PHYSMAP=y
CONFIG_MTD_PHYSMAP_START=000000
CONFIG_MTD_PHYSMAP_LEN=10000
CONFIG_MTD_PHYSMAP_BUSWIDTH=4

It does say that AMd flash found but at the end it complains that 
"cfi_probe: No supported Vendor Command Set found"

Given below are my bootup messages

Linux version 2.2.1-rmk2 (root@localhost.localdomain) (libraries: /usr/local/arm/lib/gcc-lib/arm-linux/egcs-2.91.66/:/usr/lib/gcc/arm-linux/egcs-2.91.66/:/usr/local/arm/arm-linux/lib/arm-linux/egcs-2.91.66/:/usr/local/arm/arm-linux/lib/) #916 Fri Jun 22 17:51:46 IST 2001
start_kernl: Before setup_arch, 00000000-00000000

Re: Is my flash being detected?

[Vipin Malik]

Make sure that you have included the cfi_cmdset_002.c module.

Vipin


ashwinp@aftek.com wrote:

> Hi freinds,
>         I am trying to use mtd on L7205sdb.The flash chip used is AM29LV160DB.
> The flash size is 16 MB in byte mode and processor data bus being 32 bits wide.
> The .config for MTD is as below
> CONFIG_MTD=y
> CONFIG_MTD_DEBUG=y
> CONFIG_MTD_DEBUG_VERBOSE=3
> CONFIG_MTD_CFI=y
> CONFIG_MTD_CFI_AMDEXT=y
> CONFIG_MTD_ROM=y
> CONFIG_MTD_PHYSMAP=y
> CONFIG_MTD_PHYSMAP_START=000000
> CONFIG_MTD_PHYSMAP_LEN=10000
> CONFIG_MTD_PHYSMAP_BUSWIDTH=4
>
> It does say that AMd flash found but at the end it complains that
> "cfi_probe: No supported Vendor Command Set found"
>
> Given below are my bootup messages
>
> Linux version 2.2.1-rmk2 (root@localhost.localdomain) (libraries: /usr/local/arm/lib/gcc-lib/arm-linux/egcs-2.91.66/:/usr/lib/gcc/arm-linux/egcs-2.91.66/:/usr/local/arm/arm-linux/lib/arm-linux/egcs-2.91.66/:/usr/local/arm/arm-linux/lib/) #916 Fri Jun 22 17:51:46 IST 2001
> start_kernl: Before setup_arch, 00000000-00000000
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

Re: Is my flash being detected?

[ashwinp]

Hi ,
	I got the mistake the fucntion check_cmd_set in cfi_probe.c assigns the probe function using inter_module_get_request .Since my kernel does not have module support the function returns null.For the time being I have assigned the address of the function cfi_cmdset_0002 to probe

Now I get the message
AMD/Fujitsu Extended Query table at 0x0040
number of CFI chips 1
mtd:Giving out device 0 to Physically mapped flash 
:)

so far so good  but if I try to read from the flash uisng cp /dev/mtd0 filename
Iget the following messages 
MTD_OPEN
MTD_READ
unable to handle kernel paging request at virtual address 8f80000

I think I know the reason this may be the readb from _memcpy_form_io may be trying to read from a wrong addres as the readb reads form PCMCIA_IO and I think I know the way to fix this .
	I can't use the latest kernel so I am  forced to used the mtd on a older kernel.

thanks for the suggestions,

Regards,
Ashwin 

Re: Is my flash being detected?

[David Woodhouse]

ashwinp@aftek.com said:
> 	I got the mistake the fucntion check_cmd_set in cfi_probe.c assigns
> the probe function using inter_module_get_request .Since my kernel
> does not have module support the function returns null.For the time
> being I have assigned the address of the function cfi_cmdset_0002 to
> probe

Fixed in CVS. If the command set code is built-in, it get called directly. 
The inter_module_xxx crap in 2.4 is, well, crap. :)


ashwinp@aftek.com said:
> unable to handle kernel paging request at virtual address 8f80000
> I think I know the reason this may be the readb from _memcpy_form_io
> may be trying to read from a wrong addres as the readb reads form
> PCMCIA_IO and I think I know the way to fix this .

Is the flash paged - allowing the CPU to see only a 0x80000-byte region at 
a time? There are examples (octagon-5066.c) of how to deal with this.

> 	I can't use the latest kernel so I am  forced to used the mtd on a
> older kernel. 

The code in CVS should work on older kernels. Please use it.

--
dwmw2

Re: Is my flash being detected?

[Vipin Malik]

Ok, I hit send too quickly. If you flash is not CFI, then make sure that the JDEC module is included.

Vipin





ashwinp@aftek.com wrote:

> Hi freinds,
>         I am trying to use mtd on L7205sdb.The flash chip used is AM29LV160DB.
> The flash size is 16 MB in byte mode and processor data bus being 32 bits wide.
> The .config for MTD is as below
> CONFIG_MTD=y
> CONFIG_MTD_DEBUG=y
> CONFIG_MTD_DEBUG_VERBOSE=3
> CONFIG_MTD_CFI=y
> CONFIG_MTD_CFI_AMDEXT=y
> CONFIG_MTD_ROM=y
> CONFIG_MTD_PHYSMAP=y
> CONFIG_MTD_PHYSMAP_START=000000
> CONFIG_MTD_PHYSMAP_LEN=10000
> CONFIG_MTD_PHYSMAP_BUSWIDTH=4
>
> It does say that AMd flash found but at the end it complains that
> "cfi_probe: No supported Vendor Command Set found"
>
> Given below are my bootup messages
>
> Linux version 2.2.1-rmk2 (root@localhost.localdomain) (libraries: /usr/local/arm/lib/gcc-lib/arm-linux/egcs-2.91.66/:/usr/lib/gcc/arm-linux/egcs-2.91.66/:/usr/local/arm/arm-linux/lib/arm-linux/egcs-2.91.66/:/usr/local/arm/arm-linux/lib/) #916 Fri Jun 22 17:51:46 IST 2001
> start_kernl: Before setup_arch, 00000000-00000000
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

Re: Is my flash being detected?

[David Woodhouse]

vipin.malik@daniel.com said:
> Ok, I hit send too quickly. If you flash is not CFI, then make sure
> that the JDEC module is included. 

> > It does say that AMd flash found but at the end it complains that
> > "cfi_probe: No supported Vendor Command Set found"

It looks like it's CFI. The code being used is very old though - 
CONFIG_MTD_CFI_AMDEXT was corrected to CONFIG_MTD_CFI_CMDSTD a long time 
ago. Please update to the latest code and send the full output.

--
dwmw2