Re: flash driver

liran raz ha scritto:

I've set in *.dts:
localbus@f0010100 {
 compatible = "fsl,mpc8272-localbus",
 "fsl,pq2-localbus";
 #address-cells = <2>;
 #size-cells = <1>;
 reg = <f0010100 40>;
 ==> from here "mine"
 ranges = <0 0 fc000000 04000000>;
 flash@0,0 {
 compatible = "cfi-flash";
 reg = <0 0 4000000>;
 bank-width = <4>;
 device-width = <2>;
};
I still see this message:
of-flash: probe of fc000000.flash failed with error -16
(when I try to read from /dev/mtd0 (major 90 minor 0)
it seems to read the flash content, write - fails).
Liran.


On Tue, Jul 8, 2008 at 2:04 PM, liran raz [off-list ref] wrote:

quoted

On Tue, Jul 8, 2008 at 2:34 AM, Marco Stornelli <
marco.stornelli@coritel.it> wrote:

quoted

liran raz ha scritto:

quoted

hi,
I'm trying to setup the kernel's (linux-2.6.24) flash driver.
Our flash is combined of 2 chips of S29GLN (spanion)
2 X 16 bits data chips connected to 32 bits data bus.
This flash is compatible with the AMD CFI.
I've configured the kernel to:
1. Detect flash chips by common flash interface (CFI) probe.
2. Support for AMD/Fujitsu flash chips
(The flash starts at absolute address 0xfc000000
& size is 0x4000000)
When the kernel starts I see the messages attached below,
which I think indicate that something might be wrong with
the detection of the flsah.
1. Is this correct ? - something is wrong with the flash detection?
2. Which device I need to use in order to read/write to
the flash? (I don't see any /flash device under /dev/ only:
/dev/mtd0 .. /dev/mtd3 & /dev/mtdblock0 .. /dev/mtdblock3)

Debug messages (DEBUG_CFI is defined):
physmap platform flash device: 04000000 at fc000000
Number of erase regions: 1
Primary Vendor Command Set: 0002 (AMD/Fujitsu Standard)
Primary Algorithm Table at 0040
Alternative Vendor Command Set: 0000 (None)
No Alternate Algorithm Table
Vcc Minimum:  2.7 V
Vcc Maximum:  3.6 V
No Vpp line
Typical byte/word write timeout: 128 \uffffs
Maximum byte/word write timeout: 1024 \uffffs
Typical full buffer write timeout: 128 \uffffs
Maximum full buffer write timeout: 4096 \uffffs
Typical block erase timeout: 1024 ms
Maximum block erase timeout: 16384 ms
Chip erase not supported
Device size: 0x2000000 bytes (32 MiB)
Flash Device Interface description: 0x0002
 - supports x8 and x16 via BYTE# with asynchronous interface
Max. bytes in buffer write: 0x20
Number of Erase Block Regions: 1
 Erase Region #0: BlockSize 0x20000 bytes, 256 blocks
physmap-flash.0: Found 2 x16 devices at 0x0 in 32-bit bank
 Amd/Fujitsu Extended Query Table at 0x0040
physmap-flash.0: CFI does not contain boot bank location. Assuming top.
number of CFI chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
of-flash: probe of fc000000.flash failed with error -16

Thanks,
Liran.



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of-flash: probe of fc000000.flash failed with error -16

You have to write some code in dts file like the phys address and other
stuff. The other messages could be normal, don't worry.

--
Marco Stornelli
Embedded Software Engineer
CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni
http://www.coritel.it

marco.stornelli@coritel.it
+39 06 72582838

First of all, check out the error -16 to see what exactly happens, in 
addition, check out the chip select configuration and the kernel 
configuration, for example you have to select "Flash device in physical 
memory map based on OF description".

-- 
Marco Stornelli
Embedded Software Engineer
CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni
http://www.coritel.it

marco.stornelli@coritel.it
+39 06 72582838