Prolem with CFI probe and make.jffs2 erase size

Fabio Giovagnini fabio.giovagnini at
Tue Feb 8 11:31:02 EST 2011

Hi guys.
when I boot my kernel I read:
(DEBUG_CFI enabled as suggestied by Guillaume)

physmap platform flash device: 00400001 at 20400000
Number of erase regions: 2
Primary Vendor Command Set: 0002 (AMD/Fujitsu Standard)
No Primary Algorithm Table
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: 8 �µs
Maximum byte/word write timeout: 16 �µs
Full buffer write not supported
Typical block erase timeout: 16 ms
Maximum block erase timeout: 32 ms
Typical chip erase timeout: 32 ms
Maximum chip erase timeout: 64 ms
Device size: 0x800000 bytes (8 MiB)
Flash Device Interface description: 0x0001
  - x16-only asynchronous interface
Max. bytes in buffer write: 0x1
Number of Erase Block Regions: 2
  Erase Region #0: BlockSize 0x1000 bytes, 2048 blocks
  Erase Region #1: BlockSize 0x10000 bytes, 128 blocks
physmap-flash: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 
0x0000bf Chip ID 0x00236c
NOR chip too large to fit in mapping. Attempting to cope...
number of CFI chips: 1
Reducing visibility of 8192KiB chip to 4096KiB
cmdlinepart partition parsing not available
RedBoot partition parsing not available
Using physmap partition information
Creating 3 MTD partitions on "physmap-flash":
0x000000000000-0x000000040000 : "Bootloader"
0x000000040000-0x000000200000 : "Kernel"
0x000000200000-0x000000400001 : "Flash_FS"
mtd: partition "Flash_FS" doesn't end on an erase block -- force read-only

when I create my jffs2 FS for my sh2a 7203 uP I execute
mkfs.jffs2 --big-endian --eraseblock=65536 --pad=2097152 --root=$(ROOT_FS) --

Now: the flash tells me it has 2 erase regions: one with 0x00001000 size, and 
another with 0x00010000 size.
With of them I need to specify in my --eraseblock option?

I tried to specify 0x1000 but the make.jffs2 commadn told me that it is too 
small size (I'm using ubuntu 10.4 and the mdt-utils coming with it)

Thanks a lot in advance

Ing. Fabio Giovagnini

Aurion s.r.l.
P.I e C.F.
skype: aurion.giovagnini
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