Re: JFFS2 File System Problem for ST MICRO ELECTRONICS FLASH

[alfred hitch <alfred.hitch@gmail.com>]

I am not too sure, but cna u try eraseall on the mtd partition 
and then write ur image using netflash or whatever u use .. 
also make sure ur jffs2 image was padded correctly.

Cheers,
Alfred

On 4/21/05, Vikrant_Basotra <Vikrant_Basotra@satyam.com> wrote:
> Hello All,
> My board has one 16-bit flash: ST M29W640DB.
> 
> M29W640DB (16 bit bus):
> 
> 0x00000000-0x00700000 : "Root"
> 0x00700000-0x00720000 : "U-Boot Bootloader"
> 0x00720000-0x01000000 : "Linux Kernel"
> 
> When power on, Linux kernel boots from flash and print out info such as:
> "
> ..............................................
> PPP generic driver version 2.4.2
> ..............................................
> EP8248 flash map (size->0x800000 mem->0xFF800000)
> Amd/Fujitsu Extended Query Table v1.3 at 0x0040
> number of CFI chips: 1
> cfi_cmdset_0002: Disabling fast programming due to code brokenness.
> Creating 3 MTD partitions on "EP8248 flash memory":
> 0x00000000-0x00700000 : "Root"
> 0x00700000-0x00720000 : "U-Boot Bootloader"
> 0x00720000-0x01000000 : "Linux Kernel"
> 
> ......................................
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00060000: 0x0020 instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00060004: 0x22df instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0006000c: 0x0008 instead
> Further such events for this erase block will not be printed
> ................................................................
> Further such events for this erase block will not be printed
> JFFS2: Erase block at 0x003a0000 is not formatted. It will be erased
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x003c0000: 0x0020 instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x003c0004: 0x22df instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x003c000c: 0x0008 instead
> 
> Further such events for this erase block will not be printed
> JFFS2: Erase block at 0x003c0000 is not formatted. It will be erased
> ....................................................................
> ....................................................................
> "
> In u-boot, I entered commands to display memory:
> u-boot=> md 0xff000000
> The magic number 0x1985 IS here!No 0x0020 exists at all!!
> 
> It's quite strange!! Why Linux detects 0x0020 instead?
> 
> Why U-boot can read the data on flash correctly while linux can't?
> 
> Why linux always read all data as 0x0020?
> 
> When I simply replace ST M29W640DB with AMD AM29DL640D (the two chips are
> pin-to-pin compatible,) JFFS2 works very fine!
> 
> What's the problem?
> 
> I don't want to use AMD FLASH, can u suggest me what necessary changes are to be made in the code so that the ST M29W640DB Flash work,
> 
> Regards,
> VB
> 
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