flash driver

liran raz liranrazlinux at gmail.com
Tue Jul 8 05:16:58 EST 2008

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

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