[U-Boot] Flash Not Erased for M29W128GL

[Ramesh K Khokhani]

Hi Angelo,

I am having problem with 16MB M29W128GL Flash. I am getting Flash Not Erased when i try to use saveenv command at u-boot command prompt.

I have tried manually Byte by Byte wise writing to NOR Flash location so for that i have use following command and getting 2 same byte write on consecutive location.

We have our custom board which uses MCF5329 Coldfire freescale's processor and 16MB M29W128GL NOR Flash.

We have one M5329EVB evaluation board which has same processor but 2MB LHF00F31 NOR Flash (16bit x 16bit). For this evaluation board we have LTIB packege provided by freescale and which has u-boot-2011.09 version.

This LTIB package we are using with some CFI CONFIG parameter changes. i.e. sector size, env offset add etc.

And when i have try to write word using mw.w then it writes correct.

Before use command:

-> md 0x50000

00050000: ffffffff ffffffff ffffffff ffffffff    ................
00050010: ffffffff ffffffff ffffffff ffffffff    ................
00050020: ffffffff ffffffff ffffffff ffffffff    ................
00050030: ffffffff ffffffff ffffffff ffffffff    ................
00050040: ffffffff ffffffff ffffffff ffffffff    ................
00050050: ffffffff ffffffff ffffffff ffffffff    ................
00050060: ffffffff ffffffff ffffffff ffffffff    ................
00050070: ffffffff ffffffff ffffffff ffffffff    ................
00050080: ffffffff ffffffff ffffffff ffffffff    ................
00050090: ffffffff ffffffff ffffffff ffffffff    ................
000500a0: ffffffff ffffffff ffffffff ffffffff    ................
000500b0: ffffffff ffffffff ffffffff ffffffff    ................
000500c0: ffffffff ffffffff ffffffff ffffffff    ................
000500d0: ffffffff ffffffff ffffffff ffffffff    ................
000500e0: ffffffff ffffffff ffffffff ffffffff    ................
000500f0: ffffffff ffffffff ffffffff ffffffff    ................

After use command: (Here i have try to write 0x12 on 0x50000 location but it writes two same bytes on 0x50000 & 0x50001)

-> mw.b 0x?50?aaa 0xaa

-> mw.b 0x50554 0x55

-> mw.b 0x50aaa 0xa0

-> mw.b 0x50000 0x12

-> md 0x50000

00050000: 1212ffff ffffffff ffffffff ffffffff    ................
00050010: ffffffff ffffffff ffffffff ffffffff    ................
00050020: ffffffff ffffffff ffffffff ffffffff    ................
00050030: ffffffff ffffffff ffffffff ffffffff    ................
00050040: ffffffff ffffffff ffffffff ffffffff    ................
00050050: ffffffff ffffffff ffffffff ffffffff    ................
00050060: ffffffff ffffffff ffffffff ffffffff    ................
00050070: ffffffff ffffffff ffffffff ffffffff    ................
00050080: ffffffff ffffffff ffffffff ffffffff    ................
00050090: ffffffff ffffffff ffffffff ffffffff    ................
000500a0: ffffffff ffffffff ffffffff ffffffff    ................
000500b0: ffffffff ffffffff ffffffff ffffffff    ................
000500c0: ffffffff ffffffff ffffffff ffffffff    ................
000500d0: ffffffff ffffffff ffffffff ffffffff    ................
000500e0: ffffffff ffffffff ffffffff ffffffff    ................
000500f0: ffffffff ffffffff ffffffff ffffffff    ................

When try to write word using mw.w then it writes correct:

-> md? ?w.w 0x50?aaa 0xaa

-> mw.w 0x50554 0x55

-> mw.w 0x50aaa ??xa0? ?

-> mw.w 0x500?10 0x1234

-> md 50000

00050000: 1212ffff ffffffff ffffffff ffffffff    ................
00050010: 1234ffff ffffffff ffffffff ffffffff    .4..............
00050020: ffffffff ffffffff ffffffff ffffffff    ................
00050030: ffffffff ffffffff ffffffff ffffffff    ................
00050040: ffffffff ffffffff ffffffff ffffffff    ................
00050050: ffffffff ffffffff ffffffff ffffffff    ................
00050060: ffffffff ffffffff ffffffff ffffffff    ................
00050070: ffffffff ffffffff ffffffff ffffffff    ................
00050080: ffffffff ffffffff ffffffff ffffffff    ................
00050090: ffffffff ffffffff ffffffff ffffffff    ................
000500a0: ffffffff ffffffff ffffffff ffffffff    ................
000500b0: ffffffff ffffffff ffffffff ffffffff    ................
000500c0: ffffffff ffffffff ffffffff ffffffff    ................
000500d0: ffffffff ffffffff ffffffff ffffffff    ................
000500e0: ffffffff ffffffff ffffffff ffffffff    ................
000500f0: ffffffff ffffffff ffffffff ffffffff    ................


So what may be problem?

Internally it uses following command (8bit x b bit). Is it problem? it should be 16bit x 8 bit?

fwc addr 00040aaa cmd aa aa 8bit x 8 bit
fwc addr 00040554 cmd 55 55 8bit x 8 bit
fwc addr 00040aaa cmd a0 a0 8bit x 8 bit


Thanks & Warm Regards,

Ramesh Khokhani
Senior Software Engineer

[%20]

...................................................................................................................................................

 ramesh.khokhani at igatepatni.com

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